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1
Perunov, Aleksandr. "About the choice of the test method to clarify the actual working scheme of the beam." E3S Web of Conferences 431 (2023): 06019. http://dx.doi.org/10.1051/e3sconf/202343106019.
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This article discusses the problem of determining the actual scheme of a precast reinforced concrete frame of a building when performing engineering surveys. The method of connecting precast reinforced concrete structures in industrial buildings with heavy equipment plays an important role in assessing the stress state of building structures. It is not always possible to perform the opening of nodes in the conditions of existing production, since this requires stopping technological processes or dismantling equipment. The article discusses the possibilities of static and dynamic tests for the study of support units in precast reinforced concrete structures during engineering surveys. The possibilities of static and dynamic test methods are considered, as well as the advantages and disadvantages of these methods when evaluating support units in precast reinforced concrete structures of buildings and structures during surveys. As an example for the study, the case of determining the current structural scheme of a precast reinforced concrete floor using dynamic tests is considered. The article analyzes previous studies on the use of the dynamic method in determining the actual scheme of existing reinforced concrete structures of an industrial building. The results of theoretical studies and their comparison with experimental results are presented. The general conclusions based on the results of the study are formulated, and recommendations are given on the choice of a method of testing structures for cases of establishing a structural scheme of precast reinforced concrete crossbars in operated industrial buildings during survey work.
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Polák, Aleš. "Experimental Verification of Demountable Precast Column System." Applied Mechanics and Materials 827 (February 2016): 259–62. http://dx.doi.org/10.4028/www.scientific.net/amm.827.259.
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Relocation of existing concrete structures requires full or partial demolition, which consumes a lot of energy and thus has a negative impact on the environment. From environmental point of view, demountable precast structures are sustainable. They allow “recycling” to the level of precast elements and so they save significant amounts of energy and materials. Another advantage of these structures is quick assembly without wet processes. A characteristic component of precast reinforced concrete construction system for multi-storey buildings are demountable joints of load-bearing precast reinforced concrete elements. This paper is focused on experimental verification of demountable precast column structure and its demountable steel joints. The experimental research was carried out within TA02010837 “Multipurpose dismantleable prefabricated reinforced concrete building system with controlled joint properties and possibility of repeated use”.
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Jagtap, Siddhant Millind, Shailesh Kalidas Rathod, Rohit Umesh Jadhav, et al. "Fibre Mesh in Reinforced Slabs." International Journal for Research in Applied Science and Engineering Technology 10, no. 5 (2022): 3539–40. http://dx.doi.org/10.22214/ijraset.2022.42986.
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Abstract: Fiber Reinforced Concrete is gaining attention as an effective way to improve the performance of concrete. Fibers are currently being specified in tunneling, bridge decks, pavements, loading docks, thin unbonded overlays, concrete pads, and concretes slabs. These applications of fiber reinforced concrete are becoming increasingly popular and are exhibiting excellent performance The usefulness of fiber reinforced concrete in various civil engineering applications is indisputable. Fiber reinforced concrete has so far been successfully used in slabs on grade, architectural panels, precast products, offshore structures, structures in seismic regions, thin and thick repairs, crash barriers, footings, hydraulic structures and many other applications. This study presents understanding srength of fibre reinforced conceret. Mechanical properties and durability of fiber reinforced concrete.
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Liu, Hongtao, Qiushi Yan, and Xiuli Du. "Seismic performance comparison between precast beam joints and cast-in-place beam joints." Advances in Structural Engineering 20, no. 9 (2016): 1299–314. http://dx.doi.org/10.1177/1369433216674952.
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Precast reinforced concrete structures are widely used due to many constructional advantages such as faster construction speed, lower construction cost, being environmentally friendly, higher strength, and so on. To study the seismic performance of precast reinforced concrete structures, tests on beam-to-column joints of precast reinforced concrete structures were conducted under low reversed cyclic loading. In total, four joint specimens were produced in this study, including two precast joints and two cast-in-place joints. In addition to the comparison between different types of joints, the axial compression ratio of column was adopted as the main variable in this study. Analysis was carried out on the basis of the observed joint failure mode and relationships derived from the test data such as hysteresis curves, skeleton curves, stiffness degradation curves, energy dissipation capacities, and sleeve joint strain curves. Despite the closeness of energy dissipation capacity between the precast joints and the cast-in-place joints, they had different failure modes. Precast joints feature a relatively concentrated crack distribution in which the limited number of cracks was distributed throughout the plastic zone of the beam. Cast-in-place joints feature more evenly distributed cracks in the plastic zone, especially at the later stage of the loading. The steel slippage of the precast concrete joints was found influenced by the axial compression ratio. Through this study, it is concluded that seismic resistance capacity of precast concrete joint needs to be considered in design and construction and the grouting sleeve splice could be kept away from the hinge zones when precast concrete structures were used in regions of high seismicity. The results in this study can provide a theoretical basis for seismic design of precast reinforced concrete structures, which in turn can promote the application of precast reinforced concrete structures.
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Nakata, Shinsuke. "Present Situation of Precast Reinforced Concrete Structures." Concrete Journal 32, no. 5 (1994): 5–12. http://dx.doi.org/10.3151/coj1975.32.5_5.
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BOB, Corneliu, Andras LEIDAL, and Liana BOB. "Reinforced Concrete Precast Structures with Rigid Connections." IABSE Congress Report 17, no. 7 (2008): 380–81. http://dx.doi.org/10.2749/222137908796293073.
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Zhao, Dong Qi, Yi Jun Tang, Hui Li, Gui Feng Song, and Feng Ling Guan. "The Application Research of Reinforced Concrete Multi-Ribbed Hollow Composite Slab in the Road Slab Culvert." Advanced Materials Research 368-373 (October 2011): 307–11. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.307.
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Reinforced concrete cover in the road culvert cover design, in order to facilitate the construction, usually using precast reinforced concrete solid slab, but the overall cost is not low. This article researched a reinforced concrete multi-ribbed hollow composite slab, it based on the theory of reinforced concrete multi-ribbed slab structures, using a precast reinforced concrete ribbed slab as the bottom die, then poured reinforced concrete beams and panels rib ,and them constituted a whole stack of reinforced concrete ribbed hollow slab. This kind of cover, compared with the precast reinforced concrete solid cover, is not only good mechanical properties, high integrity, but also saving concrete, steel, and bottom slab appeared smooth and fine, lower construction cost.
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Tho, Vu Dinh, Elena Anatolyevna Korol, Nikolai Ivanovich Vatin, and Hoang Minh Duc. "The Stress–Strain State of Three-Layer Precast Flexural Concrete Enclosure Structures with the Contact Interlayers." Buildings 11, no. 3 (2021): 88. http://dx.doi.org/10.3390/buildings11030088.
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The research object was three-layer reinforced precast concrete enclosure structures. The structures consist of heavy concrete B25 in the external layers and polystyrene concrete B1 in the internal layer. The stress–strain state of precast concrete structures during crack formation was studied by considering the influence of contact interlayers between different types of concretes. Stereoscopic microscopy and scanning electron microscopy were used in the experimental study of multilayer concrete blocks. Samples were made with a varied break time from 30 min to two hours between the previous and the next concrete layer placings. The experimental results showed that the contact interlayer with mutual penetration of aggregates into the adjacent concrete layers is formed in the successive layer-by-layer placing of various concretes. The thickness of the contact interlayer was up to 1 cm. The contact interlayer affects the solidity of the concrete layers’ connection and the structure’s stress–strain state. A model and method for calculating cracking in three-layer reinforced concrete structures with contact interlayers based on analytical and numerical calculations are proposed. Experimental data confirm the proposed calculation method. The results of three-layer reinforced concrete beams calculations show that: (i) the difference of the moment during crack formation in three-layer reinforced concrete beams schemes with and without taking into account the contact interlayer can reach 9.9%; (ii) the moment during crack formation obtained according to the proposed method is greater than that obtained according to the scheme of the cross-section conversion from 7.4% to 9.1%.
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Joo, Sanghoon. "Structural Performance of Precast Concrete Arch with Reinforced Joint." Journal of the Korean Society of Civil Engineers 34, no. 1 (2014): 29. http://dx.doi.org/10.12652/ksce.2014.34.1.0029.
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Folic, Radomir, Damir Zenunovic, and Nesib Residbegovic. "Strength of connections in precast concrete structures." Facta universitatis - series: Architecture and Civil Engineering 9, no. 2 (2011): 241–59. http://dx.doi.org/10.2298/fuace1102241f.
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The available experimental and numerical results of many studies of behavior of reinforced concrete connections for different stages of loading, up to fracture loading, are presented and analyzed in this paper. The problem of beam-column connection (or plate-wall connection) in prefabricated monolithic structures is emphasized. Fracture mechanisms of RC structures, the theoretical basis for their analysis, and the use of fracture mechanics in RC structures were also considered, as well as the mathematical models of prefabricated connections. In order to formulate an adequate mathematical model for calculating the connections, the dominant parameters influencing the behaviour of these connections were analyzed. A failure model for the prefabricated wall - monolithic RC plate connection was formulated. In building the model, the results of implemented experimental and numerical research of prefabricated connection in the MMS system from 2007 were used. Experiences with the implementation of the aforementioned construction system in structures in Tuzla, in the 1980's last century, were additionally used. The proposed mathematical models provide a sufficiently accurate failure assessment of prefabricated reinforced concrete connections.
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May, Sebastian, Oliver Steinbock, Harald Michler, and Manfred Curbach. "Precast Slab Structures Made of Carbon Reinforced Concrete." Structures 18 (April 2019): 20–27. http://dx.doi.org/10.1016/j.istruc.2018.11.005.
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Konin, D. V. "Stress and shear of steel reinforced floors with prefabricated units and steel beams." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 25, no. 4 (2023): 98–115. http://dx.doi.org/10.31675/1607-1859-2023-25-4-98-115.
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Steel-reinforced concrete floors with prefabricated reinforced concrete slabs are industrial quickly erectable structures. The use of such structures makes it possible to reduce construction time, save metal, obtain efficient structures without beam projecting up to 20 m for loads produced by buildings and car parks. Codes and foreign norms do not include prefabricated reinforced concrete floor slabs in the operation of combined structures, as designers try to avoid complex connections (welding, bolts) during construction. Of obvious interest is the inclusion of precast slabs in the operation of combined steel and reinforced concrete beam as well as grouted joints between steel and slabs in the absence of additional anchors and connections.Experimental results of structural models and 6×10 m floors with precast slabs are considered to identify the concrete shear. The effective shear deformation up to 0.5 mm is detected even without additional anchors. Simplest anchors significantly increase the joint operation of cast concrete and steel profile. The operation mechanism is determined for steel-concrete and steelconcrete-anchor contact zones, and respective diagrams are plotted for numerical calculations.Floor testing shows that the use of the simplest joining, cast reinforced concrete combining steel and precast elements involves precast slabs at a distance from the beam axis of at least two thicknesses of the floor for two different ways of the beam support.Numerical modelling, including the contact zone operation, shows good agreement with the experimental data. It is recommended to clarify the width of compressed concrete flange in normative documents for the structural analysis.
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Gorino, Andrea, Alessandro P. Fantilli, and Bernardino Chiaia. "Optimization of hybrid reinforcement in precast concrete linings using numerical analysis." Roads and Bridges - Drogi i Mosty 16, no. 4 (2017): 309–23. http://dx.doi.org/10.7409/rabdim.017.020.
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Concrete mixtures reinforced with a combination of steel rebar and fibers, i.e., Hybrid Reinforced Concretes (HRC), are frequently used in segmental precast tunnel linings. As massive cross-sections are usually adopted in these structures, only the minimum reinforcement is necessary to prevent the brittle failure. To study the brittle/ductile behavior of HRC tunnel segments in bending, the flexural responses of Lightly Reinforced Concrete (LRC) and that of Fiber-Reinforced Concrete (FRC) elements are modelled and combined herein. By means of this combination, the minimum reinforcement of HRC segments can be determined with a new design-by-testing procedure, in which the ductility index DI should be equal to zero. As a result, the minimum hybrid reinforcement can be defined through a linear combination of the minimum area of rebar and the minimum fiber volume fraction of LRC and FRC segments, respectively.
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Kanchle, Nikhil, Neelam Khushwa, and Nitya Durve. "Precast Concrete Work in Curved Structures." International Journal for Research in Applied Science and Engineering Technology 11, no. 7 (2023): 830–34. http://dx.doi.org/10.22214/ijraset.2023.54708.
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Abstract: Building component producers face additional hurdles as a result of free form architecture with complicated geometries. A number of famous buildings now include geometrically intricate freeform skins and structures.The skins must be decomposed into manufacturable panels and adequate support structures must be provided. This presentation will go over concrete work in curved constructions. A concrete shell, also known as a thin shell concrete structure, is a construction made of a relatively thin shell of concrete that often lacks interior columns and outside buttresses. Concrete shell construction methods are ideal for complex constructions. Curved shapes are naturally robust constructions that allow for the span of large areas without the necessity of internal supports, resulting in an open, unobstructed interior. Because concrete is generally affordable and easily cast into compound curves, using it as a building material cuts both material and construction expenses. The resulting structure could be extremely sturdy and secure. Modern thin concrete shells are composed of thin steel reinforced concrete and often lack any ribs or extra reinforcing structures, relying only on the shell structures themselves. This paper provides an overview of curved structures and shows how concrete may be utilised as a building material to create curved structures. The purpose of this article is to examine the behaviour of concrete in curved structures that will be used to build load bearing walls. The study describes methods for producing double-curved precast concrete panels with and without steel reinforcement using flexible moulds. Concrete is one of the most basic building materials. However, exposed concrete can be used attractively as well. Many architects, including Zaha Hadid and Daniel Libeskind, have employed exposed concrete panels in their designs
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Lathamaheswari, R., R. BalaKeerthana, K. Nandhini, B. Parkavi, and A. Nivedha. "Study on GFRP Reinforced Beams under Flexure." International Journal of Emerging Research in Management and Technology 6, no. 7 (2018): 156. http://dx.doi.org/10.23956/ijermt.v6i7.205.
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Acute shortage of raw materials and deterioration of reinforced concrete structural elements lead to implementation of new substitute materials and innovative technologies. Reinforced Cement Concrete structures are usually reinforced with steel bars which are subjected to corrosion at critical temperature and atmospheric conditions. The structures can also be reinforced with other materials like Fibre Reinforced Polymers (FRP). In this line Fibre Reinforced Polymer based reinforcement replacing conventional steel rod for a precast element of a prefabricated structure is considered. The precast member cast out of M25 grade concrete reinforced exclusively with locally produced Glass Fibre Reinforced Polymer (GFRP) bars including GFRP stirrups is designed, cast. Flexural behaviour of rectangular concrete beams reinforced with FRP bars and stirrups is examined with two specimens one with conventional sand as fine aggregate and another with quarry dust as fine aggregate. The load at cracking and ultimate, type of failure and crack patterns are observed and compared with those of conventional cement concrete.
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Kudzys, Algirdas, Romualdas Kliukas, and Antanas Kudzys. "ON DESIGN FEATURES OF PROPPED AND UNPROPPED HYPERSTATIC STRUCTURES." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 13, no. 2 (2007): 123–29. http://dx.doi.org/10.3846/13923730.2007.9636428.
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An effect of structural and technological features on the design methodology of hyperstatic precast reinforced concrete and composite steel‐concrete structures is discussed. Permanent and variable service, snow and wind loads of buildings and their extreme values are analysed. Two loading cases of precast reinforced concrete and composite steel‐concrete continuous and sway frame beams as propped and unpropped members are considered. A redistribution of bending moments for the ultimate limit state of beams is investigated. A limit state verification of hyperstatic beams by the partial factor and probability‐based methods is presented. It is recommended to calculate a long‐term survival probability of beams by the analytical method of transformed conditional probabilities.
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Noorsuhada, Md Noor, Ibrahim Azmi, Muhamad Bunnori Norazura, Mohd Saman Hamidah, Mat Saliah Soffian Noor, and Shahidan Shahiron. "Fatigue Crack Inspection and Acoustic Emission Characteristics of Precast RC Beam under Repetition Loading." Applied Mechanics and Materials 773-774 (July 2015): 1022–26. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.1022.
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Fatigue crack of the precast reinforced concrete beam under repetition loading is vital to be examined. Reinforced concrete structures exposed to excessive repetition loading could lead to the failure of the structures. In order to examine the active fatigue crack, the reinforced concrete beams were subjected to three-point repetition maximum loading. Eight phases of maximum fatigue loading with sinusoidal wave, frequency of 1 Hz and 5000 cycles for each phase were performed on the reinforced concrete beams. The inspection was carried out with visual observation of the crack pattern and acoustic emission technique for each load phase. The signal strength of acoustic emission was investigated. It is found that the signal strength of acoustic emission and crack pattern of the reinforced concrete beam subjected to repetition loadings showed promising results for structural health monitoring.
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Feng, De‐Cheng, Zhun Wang, and Gang Wu. "Progressive collapse performance analysis of precast reinforced concrete structures." Structural Design of Tall and Special Buildings 28, no. 5 (2019): e1588. http://dx.doi.org/10.1002/tal.1588.
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Pang, Rui, Yibo Zhang, Longji Dang, Lanbo Zhang, and Shuting Liang. "Experimental and numerical investigation on the vertical bearing behavior of discrete connected new-type precast reinforced concrete floor system." Advances in Structural Engineering 23, no. 11 (2020): 2276–91. http://dx.doi.org/10.1177/1369433220911141.
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This article proposes a new type of discrete connected precast reinforced concrete diaphragm floor system that consists of precast flat slabs and slab joint connectors. An experimental investigation of discrete connected new-type precast reinforced concrete diaphragm under a vertical distributed static load was conducted, and the effect of slab joint connectors on the load-bearing capacity was evaluated. Then, a finite element analysis of discrete connected new-type precast reinforced concrete diaphragm, precast reinforced concrete floors without slab connectors, and cast-in-situ reinforced concrete floor were performed to understand their working mechanism and determine the differences in load-bearing behavior. The results indicate that the load-bearing capacity and stiffness of discrete connected new-type precast reinforced concrete diaphragm increase considerably as the hairpin and cover plate hybrid slab joint connectors can efficiently connect adjacent precast slabs and enable them to work together under a vertical load by transmitting the shear and moment forces in the orthogonal slab laying direction. The deflection of discrete connected new-type precast reinforced concrete diaphragm in orthogonal slab laying direction is mainly caused by the opening deformation of the slab joint and the rotational deformation of the precast slabs. This flexural deformation feature can provide reference for establishing the bending stiffness analytical model of discrete connected new-type precast reinforced concrete diaphragm in orthogonal slab laying direction, which is vitally important for foundation of the vertical bearing capacity and deformation calculation method. The deflection and crack distribution patterns infer that the discrete connected new-type precast reinforced concrete diaphragm processes the deformation characteristic of two-way slab floor, which can provide a basis for the theoretical analysis of discrete connected new-type precast reinforced concrete diaphragm.
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Shi, Xiaona, Xian Rong, Lin Nan, Lida Wang, and Jianxin Zhang. "A New Steel-Joint Precast Concrete Frame Structure: The Design, Key Construction Techniques, and Building Energy Efficiency." Buildings 12, no. 11 (2022): 1974. http://dx.doi.org/10.3390/buildings12111974.
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Assembled methods play a critical role in the construction of precast concrete structures. However, conventional dry-connections-like sleeve grouting joints in precast concrete structures lagged at a low construction and management efficiency with poor quality control. In this study, a novel steel joint for precast reinforced concrete beam-column components is proposed to improve constructability. New joints transform the assembled method from reinforced concrete members into a steel structure by setting a pre-embedded steel connector at both ends of reinforced concrete beams and columns, showing outstanding economic, durability, and fire resistance capabilities. The construction process, construction efficiency, economy, and energy consumption were discussed based on the material, structure, and construction hybrid characteristics. Numerical simulation and structural health monitoring methods are used to monitor and evaluate the deformation and stress state of the proposed system in the whole construction process, so as to optimize the construction scheme and ensure safe and orderly construction. The results reveal that the FEA-simulated values of key building components during construction are in good agreement with the actual monitoring values, which verifies the feasibility of the FEM models and provides a guarantee for construction safety; the construction period of the proposed assemble system is reduced by approximately 56% and 40%, compared with the conventional reinforced concrete frame structure and cast-in-place joints in the precast concrete frame structure, respectively. Meanwhile, the energy consumption of buildings decreases by 20%. This research provides a theoretical basis for the design, calculation, and application of assembled precast structural systems.
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Saatcioglu, Murat, Denis Mitchell, René Tinawi, et al. "The August 17, 1999, Kocaeli (Turkey) earthquake damage to structures." Canadian Journal of Civil Engineering 28, no. 4 (2001): 715–37. http://dx.doi.org/10.1139/l01-043.
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The 1975 Turkish code provisions are first reviewed to provide the background for design and detailing of structures prior to the earthquake. The performance of reinforced concrete and masonry structures is described indicating many of the deficiencies in design, detailing, and construction execution. The behaviour of precast concrete structures, steel structures, and industrial facilities is also presented. The provisions of the 1997 Turkish building code are summarized and a description of new construction provides evidence of both excellent and poor construction practice. Some examples of retrofitting of damaged structures soon after the earthquake are also presented.Key words: seismic design, earthquake, Kocaeli, structures, codes, concrete, precast concrete.
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MERKULOV, Sergey, and Stanislav ESIPOV. "ADDITIONAL REINFORCEMENT OF CONCRETE AND REINFORCED CONCRETE STRUCTURES WITH COMPOSITE MATERIALS." Expert Theory and Practice, no. 1 (28) (March 5, 2025): 145–49. https://doi.org/10.51608/26867818_2025_1_145.
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Setting the task. The main task to be solved at all stages of the life cycle of buildings and structures is to ensure reliability under specified conditions and operating modes. Increasing the durability of reinforced concrete structures is solved by using non-metallic composite reinforcement. Composite reinforcement is effectively used in the manufacture of precast and monolithic reinforced concrete, as well as in the reinforcement of exploited reinforced concrete structures. The development of the design theory of this class of structures involves experimental and theoretical research. The purpose of the work is to study bent reinforced concrete elements, including those with torsion, reinforced with external reinforcement and concrete elements with rod composite reinforcement, to study the joint work of composite materials with concrete as part of the structure. Research objectives: to study the strength and deformability of concrete structures reinforced with composite polymer reinforcement and reinforced concrete structures reinforced with external reinforcement; to assess the adhesion of external composite reinforcement to the surface of concrete structures; to develop proposals for the normalization of the mechanical characteristics of composite reinforcement. Results. The results of experimental studies of bent and torsion-bent reinforced concrete elements under short-term and long-term loading are presented, as well as the results of studies of bent concrete elements with rod reinforcement. Conclusions. The significance of the results lies in the fact that the new experimental data obtained will allow us to improve the methodology for designing structures with composite reinforcement.
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Nosenko, Viktor, and Oleg Krivenko. "Influence of house bearing construction rigidi-ty of precast reinforced concrete on stress-strain state Continuous Flight Auger (CFA) piles foundations." Bases and Foundations, no. 40 (June 4, 2020): 48–57. http://dx.doi.org/10.32347/0475-1132.40.2020.48-57.
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At present, the tendency to build multi-storey residential buildings has become widespread in Ukraine. This is due to a number of reasons: significant increase in land prices in cities, dense urban development and the availability of appropriate equipment for the construction of such structures. One of the most common materials for multi-storey buildings is monolithic reinforced concrete. The main advantage of monolithic structures is the possibility of free spatial planning and the possibility of uniform redistribution of forces in the elements of the frame - the house works as one rigid entire structure. On the other hand, such structures require a long construction time and appropriate highly qualified control of monolithic works. Therefore, as an alternative, prefabricated reinforced concrete structures are used to accelerate the pace of construction.
 In this work, the influence of the rigidity of a precast reinforced concrete house on the stress-strain state of CFA piles foundation is investigated. The stress-strain state of a precast reinforced concrete building with two basement options is analyzed: precast and monolithic.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 The numerical modeling of the interaction of the system elements is used as a research method: soil base - foundation - aboveground structure.
 It was found that the replacement in a prefabricated house only one basement floor of precast concrete on a monolithic one affects the redistribution of forces, so the self-supporting wall is loaded 2.6 times, and the busiest wall, which rests on both sides of the floor slab, is unloaded to 2.1 times.
 It was found that in the case of a basement made of precast reinforced concrete with a precast basement the difference efforts in pile heads (under the load-bearing walls) can differ 1.98 times, and in the case of a monolithic one 1.17 times. So it is mean, the monolithic foundation redistributed of efforts between the piles is more uniform.
 It is established that the monolithic reinforced concrete basement, in comparison with the prefabricated one, reduces the uneven settlement of the foundation by 2.4 times.
 When designing large-panel houses, it is advisable to provide a basement floor monolithic - this will allow to load the fundamental constructions more evenly, which in its reduction reduces the relative deformation of buildings and reduces their cost.
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Koyankin, A. A., and V. M. Mitasov. "Stressstrain state of cast-in-place and precast structure with loaded cast-in-place element." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 23, no. 3 (2021): 129–42. http://dx.doi.org/10.31675/1607-1859-2021-23-3-129-142.
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The paper presents the strength analysis of cast-in-place and precast structures in accordance with regulatory documents, which require clarifications, since the properties of such structures distinguish them from conventional reinforced concrete structures. These properties include the beginning of the deformation process, ultimate strain, physical properties, and others. The strength analysis of cast-in-place and precast structure is conducted with regard to these properties.The proposed analysis is based on the load-bearing capacity exhaustion of deformed concrete or reinforcement and allows considering the different time of involvement in the deformation process of cast-in-place and precast structures as well different stress and strain properties of concrete. The experimental data are in good agreement with theoretical calculations.
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Murtazin, R., K. Mukhamadeev, and L. Sabitov. "RESEARCH ON PRECAST REINFORCED CONCRETE FRAME SYSTEMS WITH FLAT CEILING." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 10, no. 1 (2024): 128–37. https://doi.org/10.34031/2071-7318-2024-10-1-128-137.
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The paper gives a brief review of existing load-bearing frame systems with a flat bottom edge of the slab, performed using prefabricated reinforced concrete products. The basic provisions and results of field testing of floor elements of the prefabricated reinforced concrete load-bearing frame, which is not widely spread in the Russian Federation, according to patent No. 132814 «Prefabricated Reinforced Concrete Frame» are also described. Research on the existing load-bearing systems with flat bottom edge of the slab was carried out by studying the patent documentation available in the All-Russian Patent and Technical Library; information posted by the authors in open sources, scientific articles by the authors of the load-bearing systems. In-situ tests of the slab elements of the framework according to the patent No. 132814 «Prefabricated reinforced concrete framework» were performed by means of empirical experiment with loading of prefabricated elements according to the considered system of prefabricated-monolithic reinforced concrete construction. During the tests, the vertical displacements of the elements, the appearance and width of their crack opening were measured, and the destructive load was recorded. The safety factor according to GOST 8829-2018 for the tested slab elements was calculated based on the recorded destructive load. The values of destructive load of the slab structures obtained in the test results confirm the reliability of the adopted solutions, which substantiates the expediency of their further development. The safety coefficients of transoms and floor slabs obtained according to GOST 8829-2018 satisfy the strength requirements for building structures.
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You, Young-Jun, Hyeong-Yeol Kim, Gum-Sung Ryu, Kyung-Taek Koh, Gi-Hong Ahn, and Se-Hoon Kang. "Strengthening of Concrete Element with Precast Textile Reinforced Concrete Panel and Grouting Material." Materials 13, no. 17 (2020): 3856. http://dx.doi.org/10.3390/ma13173856.
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Textile reinforced concrete (TRC) has widely been used for strengthening work for deteriorated reinforced concrete (RC) structures. The structural strengthening often requires accelerated construction with the aid of precast or prefabricated elements. This study presents an innovative method to strengthen an RC slab-type element in flexure using a precast panel made of carbon TRC. A total of five RC slabs were fabricated to examine the flexural strengthening effect. Two of them were strengthened with the precast panel and grouting material and another set of two slabs was additionally strengthened by tensile steel reinforcement. The full-scale slab specimens were tested by a three-point bending test and the test results were compared with the theoretical solutions. The results revealed that the ultimate load of the specimens strengthened with the TRC panel increased by at least 1.5 times compared to that of the unstrengthened specimen. The application of the precast TRC panel and grouting material for the strengthening of a prototype RC structure verified its outstanding constructability.
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Yang, Jun, Zhaoming Yuan, Jie Liu, and Shuqi Yu. "Study on Lifetime Performance Evaluation of a Precast Prestressed Concrete Frame in Chloride Environments." Materials 16, no. 20 (2023): 6666. http://dx.doi.org/10.3390/ma16206666.
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This study established a comprehensive framework for evaluating the lifetime performance of precast prestressed concrete frames exposed to chloride environments. The proposed analytical framework enabled a scientifically grounded and rational assessment of both the service life and residual load-carrying capacity of precast prestressed concrete frames in chloride environments. It further served as the foundational basis for making informed decisions regarding the repair and maintenance of pertinent structures. Based on Fick’s second law, this evaluation framework established the probability distribution of the corrosion initiation time and cracking time of reinforced concrete structures due to corrosion expansion in a chloride environment. Additionally, based on the fragility analysis model and results of a precast prestressed concrete frame in a chloride environment, a practical method for evaluating the time-varying seismic performance of the precast structure considering the influence of corrosion was proposed. Furthermore, by employing the path probability model and reliability theory, time-varying reliability models were proposed to predict the three limit states of the precast prestressed concrete frame. According to the analysis results of a four-story planar frame, it could be seen that the corrosion initiation time and normal service limit state were highly sensitive to the chloride ion diffusion coefficient of the composite layer in precast concrete structures. Compared to cast-in-place structures, the presence of a composite layer in precast concrete structures could lead to more severe degradation of the time-varying seismic performance of the precast prestressed concrete frame.
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Bogdan, Hauşi Sorin. "Issues Regarding the Appropriateness of Using Precast Reinforced Concrete Frame Structures Compared to Monolithic Reinforced Concrete Frame Structures, in Office Buildings and Residential Buildings." Bulletin of the Polytechnic Institute of Iași. Construction. Architecture Section 67, no. 3 (2022): 35–50. http://dx.doi.org/10.2478/bipca-2021-0023.
Full textAbstract:
Abstract Given the current context at national and European level in terms of reducing skilled labour force in constructions, as well as the high level of density and traffic in large cities, there is an increasing emphasis on the possibility of shortening the duration of building the structural frames on site, reducing the number of workers or even reducing the level of noise pollution. Thus, the introduction of precast technologies in the case of office buildings and residential buildings, with multi-storey frame structure, is becoming an increasingly pressing and topical issue. The purpose of this paper is to enable structural engineers, architects and potential investors to consciously choose the type of optimal structure, taking into account a number of technical and economic aspects. In this sense, in order to highlight the main advantages and disadvantages of using multi-storey precast reinforced concrete frame structures, a comparative case study will be carried out between a precast frame structure and a monolithic frame structure, respectively.
29
Mukhamediev, T. A., and S. A. Zenin. "New amendment to the Code of Practice on the design of fiber-reinforced concrete structures with non-steel fibers." Bulletin of Science and Research Center of Construction 36, no. 1 (2023): 51–58. http://dx.doi.org/10.37538/2224-9494-2023-1(36)-51-58.
Full textAbstract:
Introduction. The acting version of the Code of Practice on the design of fiber-reinforced concrete structures with non-steel fibers SP 297.1325800.2017 “Fiber-reinforced concrete structures and precast products with non-steel fibers. Design rules” contain no instructions for the strength calculation of circular cross-sections with and without reinforcement under the action of bending moments and longitudinal forces. In addition, the current version provides no instructions for determining the subclass index of fiber-reinforced concrete with non-steel fibers using the residual axial tensile strength, as well as those for calculating the fire resistance of fiber-reinforced concrete structures. The absence of these provisions leads to significant difficulties in the design of individual structures made of fiber-reinforced concrete, which increases material and time expenditures.Aim. To improve the system of urban planning activities in terms of clarifying and supplementing the current regulatory documents for the design of fiber-reinforced concrete structures with non-steel fibers.Methods and materials. A draft of amendment No. 2 to SP 297.1325800.2017 was developed taking into account contemporary requirements, as well as the latest scientific research. In particular, the results of the research work concerning the fire resistance of structures made of fiber-reinforced concrete with non-steel fibers, performed by the Research Institute of Concrete and Reinforced Concrete (NIIZHB) named after A.A. Gvozdev in 2020, were taken into account. In addition, the experience of the authors and design organizations, gained during the practical application of this Code of Practice, was analyzed in order to clarify its provisions for the convenience of users.Results. The results of the work involve the draft of the amendment No. 2 to SP 297.1325800.2017, whose positions include new calculation techniques, as well as the refinements of existing calculation and construction methods. The developed amendment has passed public discussions, as well as the necessary expertise, and is being prepared for approval and enactment.Conclusion. Positions of amendment No. 2 to SP 297.1325800.2017 “Fiber-reinforced concrete structures and precast products with non-steel fibers. Design rules” can be used to develop reliable design solutions for these structures, including the achievement of a certain economic effect.
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Tamrazyan, Ashot, and Arman Minasyan. "The influence of depth of tensile concrete deterioration on the load bearing strength and deflections of corrosion-damaged floor slabs." MATEC Web of Conferences 251 (2018): 02012. http://dx.doi.org/10.1051/matecconf/201825102012.
Full textAbstract:
The paper considers the change of load-bearing strength and deflections of corrosion-damaged precast reinforced concrete floor slabs in the conditions of cyclic freezing-thawing in full-scale climatic conditions. The aim of the study is to determine the influence of the depth of tensile concrete deterioration on the change in load-bearing strength and deflections. Corrosion-damaged precast reinforced concrete floor slabs were selected and experimental investigation was performed. Based on the results of the study, the influence of the depth of deterioration of tensile zone of concrete on the load-bearing strength and deflections of structures was determined. At the same time, as the loads increase, deflections increase and the height of the compressive zone decreases. In the experimental investigation, changes of the load-bearing strength and deflections of precast reinforced concrete slabs were determined, depending on the depth of tensile concrete deterioration. The performed studies allow us to estimate the load-bearing strength and deflection values of corrosion-damaged reinforced concrete slabs depending on the relative value of the concrete deterioration in the tensile zone without performing additional experiments and calculations.
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SOKOLOV, Boris, Vitaly TITAEV, and Dmitry PASKHIN. "PRECAST SHELLS MADE OF UNITS BENT DURING FORMING." Bulletin of Science and Research Center “Stroitelstvo”, no. 3 (30) (August 30, 2021): 66–77. http://dx.doi.org/10.37538/2224-9494-2021-3(30)-66-77.
Full textAbstract:
In construction, thin-walled reinforced
 concrete spatial structures are used both
 for unique roofs of large-span buildings and
 for mass buildings of the pavilion type and
 small architectural forms. The most serious
 obstacle to the widespread application of
 economical thin-walled reinforced concrete
 structures is the shortcomings of the technology
 used for the manufacture and installation
 of prefabricated shell elements. The
 method of bending just formed flat flexible
 plates to give them a curved shape is one
 of the most promising technological methods
 that allow you to abandon the use of
 expensive metal forms of complex curved
 outlines, significantly simplify all production
 processes.
 The article describes the experience of
 research and development of structural decisions
 for spatial structures of building roofs
 with the use of unified rhombic elements
 made by the method of bending a flat just
 formed sheet on a flexible formwork.
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Sangeetha, P., and M. Shanmugapriya. "Prediction of mechanical strength of polypropylene fibre reinforced concrete using artificial neural network." Gradjevinski materijali i konstrukcije 63, no. 4 (2020): 79–86. http://dx.doi.org/10.5937/grmk2004079s.
Full textAbstract:
The usefulness of fibre reinforced concrete (FRC) in various civil engineering applications is indisputable. Fibre reinforced concrete has been successfully used so far in construction of structures like bridges, industrial structures, concrete, architectural panels, precast products, offshore structures and many other applications. This paper presents the study on the mechanical properties of the polypropylene fibre reinforced concrete. The parameters varied in the study include volume of fibre (0%, 0.5%, 1.0%, 1.5% & 2.0%) and the curing period (7 days and 14 days). From the study it is concluded that the further increases in the volume of fibre reduces the water cement ratio. The mechanical properties of the polypropylene fibre reinforced concrete were also predicted by using Artificial Neural Network (ANN) and found to have minimal error when compared to actual experimental results.
33
Kakharov, Zaytzhan Vasidovich, and Nodirbek Bakhtiyor coal Kodirov. "ENERGY SAVINGS IN PRODUCTION PRECASTED CONCRETE." Chronos 6, no. 10(60) (2021): 13–16. http://dx.doi.org/10.52013/2658-7556-60-10-3.
Full textAbstract:
This article discusses the problems of energy savings at enterprises for the production of precast concrete. The rational consumption of energy in the production of prefabricated reinforced concrete is considered, the costs of energy spent on the production of cement and reinforcement are taken into account, excluding excessive consumption of fuel, which leads to energy savings. To save energy resources, a bench technology for manufacturing prefabricated reinforced concrete structures was considered at the enterprises.
34
Holý, Milan, and Lukáš Vráblík. "The Timber-Precast UHPC Composite Connection." Solid State Phenomena 272 (February 2018): 21–27. http://dx.doi.org/10.4028/www.scientific.net/ssp.272.21.
Full textAbstract:
This paper deals with the connection of timber beams and precast concrete slabs. The connection of timber and concrete has many advantages associated with the efficient use of both materials, not only in terms of their stress. Timber is a natural renewable material. It can be achieved some savings of volume of the concrete by its application and thereby also reducing of the environmental burden. By the combining of the timber and ultra-high performance concrete (UHPC), it can be designed very subtle, bearable, aesthetic and durable structures. The conventional timber-concrete composite structures are most often realized by joining of the timber beams and the cast in-situ reinforced concrete slabs. However, the cast in-situ slab is not very suitable for UHPC application and it has some structural disadvantages, in particular the need to protect the timber beams against moisture penetration from the fresh concrete mix, the need for formwork, etc. The prefabrication eliminates some disadvantages of the cast in-situ design, increases the quality of the structure and speeds up the construction process. In the case of the timber-concrete composite structures, the prefabrication has a positive impact on the reduction of the concrete shrinkage projections as the development of deflections and the redistribution of internal forces between the connected parts of the cross-section. Some special coupling elements must be used for connection in the case of precast slabs. This paper summarizes the research findings in the field of development of special coupling elements for composite timber-precast concrete structures. The development of the new coupling elements for pedestrian and cyclist timber-UHPC composite footbridges is presented.
35
Lindner, Marco, Konrad Vanselow, Sandra Gelbrich, and Lothar Kroll. "Fibre-reinforced polymer stirrup for reinforcing concrete structures." Technologies for Lightweight Structures (TLS) 3, no. 1 (2020): 17–24. http://dx.doi.org/10.21935/tls.v3i1.117.
Full textAbstract:
Fibre-plastic composites offer an interesting alternative to concrete reinforcement. In order to expandthe application spectrum of reinforcing elements in fibre composite construction, a new steel-free bracingsystem with reduced radii of curvature was developed. An improvement in load carrying capacity couldbe proven in extensive investigations based on international testing methods and verified by practicaltests. With the help of newly reinforced precast concrete elements from the area of waterways and trafficroutes, a high potential for lightweight construction and resource efficiency can be impressivelydemonstrated.
36
Mohammad, Arastu, and Khalid Moin Prof. "Study of Progressive Collapse of Precast Steel Reinforced Concrete Building." International Journal of Recent Technology and Engineering (IJRTE) 12, no. 1 (2023): 81–94. https://doi.org/10.35940/ijrte.A7617.0512123.
Full textAbstract:
<strong>Abstract:</strong> Progressive collapse starts when any load-carrying elements of the building collapse during extreme loading, such as earthquakes, blasts, or fire. The Precast Steel Reinforced Concrete (PSRC) buildings comprise of precast RCC columns and steel girders. These structural elements are connected to form a moment-resisting frame and are susceptible to progressive collapse. However, this structural system has the advantage of inherent stiffness and damping during lateral loads and is also known for its construction efficiency, lightweight and low cost. Earlier investigations have shown PSRC systems useful in designing and constructing buildings while maintaining ample strength and high ductility during seismic incidents. Despite much previous research, the PSRC structural system's use is limited in high seismic regions. This paper aims to study the progressive collapse of the PSRC building using non-linear dynamic analysis and U.S. General Service Administration (GSA) guidelines during extreme loading. Two structures are studied to validate the performance of progressive collapse of PSRC and RCC structures. Four-story PSRC and RCC buildings are designed according to Indian Codes of practice. Design columns under provisions of the Indian reinforced concrete structures code, and beams are designed according to the Indian steel construction code. Comparative studies of progressive collapse for the two buildings are presented.
37
Hery, Kristiyanto, Triwiyono Andreas, Muslikh, and Saputra Ashar. "Beam-to-Beam Connection of Precast Concrete Structures: State of the Art." MATEC Web of Conferences 258 (2019): 04002. http://dx.doi.org/10.1051/matecconf/201925804002.
Full textAbstract:
The use of precast concrete is known to improve productivity, quality control, and cost efficiency in reinforced concrete structure. The Connection is the most important aspect of precast concrete structures. The connection transfers force between the precast components, determine strength, stiffness, and ductility of the whole structure. Providing joint in the beam-column connection region always cause difficulties during the erection stage. Relocation of the connection at a certain distance from the column to the beam span is an alternative solution that creates the beam-to-beam connection. It will be much easier to assemble the connection that consists of some joints. Research and application of the precast concrete beam-to-beam connection details have published since 1975. This paper reviews the state of the art of research and practical application of beam-to-beam connection system related to connection models, joint locations, and details. It concluded from the review that the developing research leads to improve the performance of earthquake resisting structures
38
Elvira, Elvira. "UTILIZING FIBER MESH AND NYLON ROPE AS NON-STEEL REINFORCEMENT FOR SANDWICH CONCRETE PLATE PRECAST IN COASTAL AREA STRUCTURES." Jurnal Teknik Sipil 24, no. 2 (2024): 964. http://dx.doi.org/10.26418/jts.v24i2.79724.
Full textAbstract:
Reinforced concrete, a popular construction choice, is often selected due to the limited availability of materials like wood and increased familiarity with concrete. However, coastal structures using steel bars in reinforced concrete usually face corrosion issues. Corrosion can be mitigated by increasing concrete compressive strength and enlarging the concrete cover to protect the steel from saltwater. These measures are challenging for small structures due to the small dimensions of columns, beams, and plates, making thick concrete covers difficult. Additionally, small structures are often built manually or semi-manually, complicating the achievement of higher compressive strength and watertightness. However, there is hope. Researchers have developed reinforced concrete with non-metal reinforcement, such as fiber mesh and nylon rope, and combined regular and lightweight concrete to reduce dead loads, creating a sandwich concrete slab. Test results show that the slab has sufficient strength for light construction, with a strong bond between mortar and foam concrete. Although fiber mesh and nylon rope do not yet increase the slab's flexural strength, nylon rope prevents brittle failure. This promising research paves the way for further studies and potential improvements in the future.
39
Arastu, Mohammad, and Prof Khalid Moin. "Study of Progressive Collapse of Precast Steel Reinforced Concrete Building." International Journal of Recent Technology and Engineering (IJRTE) 12, no. 1 (2023): 81–94. http://dx.doi.org/10.35940/ijrte.a7617.0512123.
Full textAbstract:
Progressive collapse starts when any load-carrying elements of the building collapse during extreme loading, such as earthquakes, blasts, or fire. The Precast Steel Reinforced Concrete (PSRC) buildings comprise of precast RCC columns and steel girders. These structural elements are connected to form a moment-resisting frame and are susceptible to progressive collapse. However, this structural system has the advantage of inherent stiffness and damping during lateral loads and is also known for its construction efficiency, lightweight and low cost. Earlier investigations have shown PSRC systems useful in designing and constructing buildings while maintaining ample strength and high ductility during seismic incidents. Despite much previous research, the PSRC structural system's use is limited in high seismic regions. This paper aims to study the progressive collapse of the PSRC building using non-linear dynamic analysis and U.S. General Service Administration (GSA) guidelines during extreme loading. Two structures are studied to validate the performance of progressive collapse of PSRC and RCC structures. Four-story PSRC and RCC buildings are designed according to Indian Codes of practice. Design columns under provisions of the Indian reinforced concrete structures code, and beams are designed according to the Indian steel construction code. Comparative studies of progressive collapse for the two buildings are presented.
40
Prof.Eshwaraj, Dr. Vinod B R, Dr. Ananthayya M B, and Prof. Gowtham B. "Precast Concrete Construction Technology." International Research Journal on Advanced Science Hub 7, no. 02 (2025): 70–78. https://doi.org/10.47392/irjash.2025.009.
Full textAbstract:
Multi-storey building would be the greater part influenced by quake constrains to seismic prone areas. The major concern in the design of the multi-Storey building is the structure to have enough lateral stability to resist lateral forces buckling to control lateral drift and displacement of the building. The application of the shear wall system in Reinforcement concrete (RC) building has been widely used to minimize seismic consequences. Besides, the building with concentrated steel bracing system is used for the building. Both of the system has significance of the structural performance. Although both systems are used for same reason, their effect shows unequal variation and behaviours against seismic load. In the Project, G+10 storey building, along with shear wall and bracing are being considered for the analysis. The performance of building will be evaluated on the basis of following parameters Story displacement, Storey drift. In this work, the shear wall and bracing are provided at different locations with the overall analysis to be carried out using STAAD PRO Reinforced concrete structures are in greater demands in construction because the construction becomes quite convenient and economical in nature. RCC construction is best suited for low rise building but in High rise building construction are composite is a better option among the RCC and steel Structure.
41
Tang, Baijian, Jiawei Wang, Huiyuan Shi, Zhiyuan Xia, Yongjie Zhang, and Li Chen. "Numerical Simulation Methodology for Prefabricated Shear Walls Considering Stochastic Defects in Grouting Materials." Buildings 12, no. 11 (2022): 1859. http://dx.doi.org/10.3390/buildings12111859.
Full textAbstract:
The most used connection form for reinforced steel bars is the grouting sleeve using cement-based grouting materials. Hence, the quality of the grouting sleeve connection determines whether the performance of a precast concrete structure is equivalent to that of a cast in situ concrete structure. However, several existing reasons, namely, insufficient grouting cement or poor construction controls and even stochastic bubble holes, lead to inevitable grouting defects. The behavior of precast concrete structures is affected dramatically. Considering the cost and efficiency of the analysis of precast concrete structures, the finite element method is still the most used method, but the simulation technology of structures considering stochastic defects in grouting materials is not sufficient. Herein, a simulation method considering stochastic defects in precast concrete structures is proposed, and the application of the method to grouting sleeves and shear wall structures is performed to verify its accuracy and feasibility. The construction of stochastic defects in grouting material is first realized through the Python scripter. Secondly, the mechanical parameters are obtained from the refined finite element analysis of grouting sleeves with material defects. Finally, based on the obtained mechanical properties of grouting sleeves, the behaviors of precast shear walls under blast loading are analyzed. The simulations of grouting sleeves under uniaxial tensile loading and precast concrete shear walls under blast loading both indicate that the proposed numerical method is feasible in solving the structural issues with stochastic defects in grouting materials.
42
Poloz, Maxim A., Nikolay V. Frolov, Andrey V. Shevchenko, and Jan Jimei. "Analysis of Prestressed Bent Precast-Cast-In-Situ Structures in Vlasov-Mileykovsky Method with Physical Non-Linearity of Material." Materials Science Forum 974 (December 2019): 601–7. http://dx.doi.org/10.4028/www.scientific.net/msf.974.601.
Full textAbstract:
Precast reinforced concrete structures with and without reinforcement pre-stressing are used both as newly designed independent ones and are the result of work to strengthen the existing structures by increasing the section. In both cases, the cross section of such elements is considered as a two-layer section, and the resulting composite element works under load under conditions distributed between the layers of internal forces, the mechanism and actual distribution of which depends on the physical and mechanical characteristics, the design scheme and the layers contact interaction parameters. When calculating and designing prestressed reinforced concrete precast-monolithic elements, the shear seam ductility is usually not paid much attention to, which complicates the structure actual stress-strain state analysis and contains a certain undiscovered potential of its rational design. One of the possible directions in solving the problem, which takes into account the contact seam shift, is the structural mechanics variation principles use in the calculation of structures such as rods of composite section. The questions of a composite reinforced concrete precast-monolithic rod of the variation principles of structural mechanics based on the method of V.Z. Vlasov - I.E. Mileykovsky in the displacements form in combination with the step-iterative method of calculation practical applicability in the structural analysis is considered in this work,. The numerical calculations results according to the proposed method are given. This allows to take into account the precast and monolithic layers shear connections specifics, to take practical account of weld compliance, and also to take into account the material characteristics’ physical non-linearity, which contributes to the precast monolithic structures rational design.
43
KAPRIELOV, Simon, Andrey SHEYNFELD, Igor ARZUMANOV, and Igor CHILIN. "NEW NATIONAL STANDARD FOR SELF-COMPACTING CONCRETE MIXES." Bulletin of Science and Research Center “Stroitelstvo”, no. 3 (30) (August 30, 2021): 30–40. http://dx.doi.org/10.37538/2224-9494-2021-3(30)-30-40.
Full textAbstract:
The information about the new national
 standard GOST R «Self-compacting concrete
 mixtures. Specifications», developed by
 the «Research Institute for Concrete and
 Reinforced Concrete» named after A.A.
 Gvozdev, of JSC «Research Center of
 Construction», is presented.
 The standard applies to ready-to-use selfcompacting
 concrete mixtures of heavyweight,
 fine-grained, light-weight and reactive
 powder concretes, as well as fiber reinforced
 concretes, for the production of monolithic or
 precast concrete structures and products, the
 shape and reinforcement of which makes it
 difficult to place and compaction of an ordinary
 concrete mixture.
 The standard establishes new terms
 and definitions, types and designations,
 uniform requirements for new technological
 characteristics (slump-flow, segregation,
 viscosity and flowability), acceptance
 rules and test methods, production and
 transportation processes, control and
 evaluation procedures conformity of quality
 indicators of self-compacting concrete
 mixes.
44
Koyankin, Alexandr, and Valeriy Mitasov. "Assessment of structural reliability of precast concrete buildings." MATEC Web of Conferences 143 (2018): 01001. http://dx.doi.org/10.1051/matecconf/201814301001.
Full textAbstract:
Precast housing construction is currently being under rapid development, however, reliability of building structures made from precast reinforced concrete cannot be assessed rationally due to insufficient research data on that subject. In this regard, experimental and numerical studies were conducted to assess structural reliability of precast buildings as described in the given paper. Experimental studies of full-scale and model samples were conducted; numerical studies were held based on finite element models using “Lira” software. The objects under study included fragment of flooring of a building under construction, full-size fragment of flooring, full-scale models of precast cross-beams-to-columns joints and joints between hollow-core floor slabs and precast and cast-in-place cross-beams. Conducted research enabled to perform an objective assessment of structural reliability of precast buildings.
45
FEDOROVA, N. V., S. YU SAVIN, V. I. KOLCHUNOV, V. S. MOSKOVTSEVA, and M. A. AMELINA. "BUILDING STRUCTURAL SYSTEM MADE OF INDUSTRIAL FRAME-PANEL ELEMENTS." Building and reconstruction 107, no. 3 (2023): 70–81. http://dx.doi.org/10.33979/2073-7416-2023-107-3-70-81.
Full textAbstract:
The paper presents a new structural solution of the precast-monolithic frame for prefabricated residential and civil buildings of various storeys manufactured from prefabricated industrial reinforced concrete elements. The precast frame structures include L-shaped and inverted U-shaped precast elements, installed in the longitudinal and transverse directions and forming a frame, hollow-core slabs and bracing perforated beams of the outer contour, on which fencing non-bearing wall structures are supported within each storey. The computational model of the precast-monolithic building frame was developed using different degrees of discretization at different stages of the analysis. This allowed to obtain both a general picture of structural system deformation in the limiting and over limit states caused by special and emergency actions, and a detailed picture of the stressed state in concrete and reinforcement of structural elements before and after cracking. The paper provides the results of the comparative analysis of the effectiveness of application of the proposed structural system in the mass construction as compared with the applied constructions of large-panel buildings. It has been shown that the application of the proposed structures of panel-frame elements allows considerably reduce the material capacity, cost and transportation expenses of the reinforced concrete frame by up to 30 %, ensuring the mechanical safety of the building.
46
Kolchunov, Vitaly I., Natalia V. Fedorova, Sergei Y. Savin, and Pavel A. Kaydas. "Progressive Collapse Behavior of a Precast Reinforced Concrete Frame System with Layered Beams." Buildings 14, no. 6 (2024): 1776. http://dx.doi.org/10.3390/buildings14061776.
Full textAbstract:
A possible way to improve the structural safety and robustness of precast building structures is to develop effective precast frame systems with layered beams, which combine prefabricated parts with cast-in situ ordinary concrete, high-performance concrete, fiber concrete, or FRP. The paper provides a new type of precast reinforced concrete frame system with layered beams for rapidly erected multi-story buildings resistant to accidental actions. Using a combination of the variational method and two-level design schemes, a simplified analytical model has been developed for structural analysis of the precast reinforced concrete frame system, both for serviceable and ultimate limit states as well as for accidental actions. The proposed model allows for determining shear deformations and the formation and opening of longitudinal cracks in the intermediate contact zone between precast and monolithic parts of reinforced concrete structural elements of the frame, as well as the formation and opening of normal cracks because of the action of axial tensile force or bending moment in these elements. The design model was validated by comparing the calculated and experimental data obtained from testing scaled models of the precast reinforced concrete frame system with layered beams. The paper investigates and thoroughly analyzes the factors affecting the stiffness and bearing capacity of the intermediate contact zone, discusses the criteria for the formation of shear cracks along the contact zone of precast and monolithic concrete, and examines the change in the stiffness and dissipative properties of layered elements at different stages of their static–dynamic loading. The robustness of the experimental models of the structural system was not ensured under the specified load, section dimensions, and reinforcement scheme. Following an accidental action, longitudinal cracks were observed in the contact joint between the monolithic and prefabricated parts in the layered beams. This occurred almost simultaneously with the opening of normal cracks in adjacent sections. A comprehensive analysis of the results indicated a satisfactory degree of agreement between the proposed semi-analytical model and the test data.
47
Yan, Qiushi, Bowen Sun, Xuemei Liu, and Jun Wu. "The effect of assembling location on the performance of precast concrete beam under impact load." Advances in Structural Engineering 21, no. 8 (2017): 1211–22. http://dx.doi.org/10.1177/1369433217737119.
Full textAbstract:
With incorporation of assembling joints, precast concrete beams could behave very differently in resisting both static and dynamic loads in comparison to conventional reinforced concrete beams. With no research available on the dynamic behavior of precast concrete beams under impact load, a combined experimental and numerical study is conducted to investigate the dynamic response of precast concrete beams under impact load. The results were also compared with reinforced concrete beams. Four groups of concrete beams were tested with all beams designed with the same reinforcement, but different assembling locations were considered for precast concrete beams. The effects of the assembling location in resisting drop weight impact of precast concrete beams were analyzed. The influence of impact mass and impact velocity on the impact resistance of precast concrete beams were also investigated. The results revealed that the further the assembling location is away from the impact location, the closer the mechanical performance of the precast concrete beam is to that of the reinforced concrete beam. When the assembling location and the impact location coincided, the assembling region suffered from severe local damages. With increased impact velocity and impact energy, the damage mode of the precast concrete beams may change gradually from bending failure to bending–shear failure and eventually to local failure. In addition, the bonding around the assembling interface was found to be effective to resist drop weight impact load regardless of the magnitude of the impact velocity and energy.
48
Koh, Taehoon, and Moochul Shin. "Field Tests on Eco-Friendly Railway Precast Concrete Slab." Applied Sciences 10, no. 12 (2020): 4140. http://dx.doi.org/10.3390/app10124140.
Full textAbstract:
This study focuses on evaluating the field performance of a newly developed eco-friendly precast concrete slab track structure for railway/subway systems in Seoul, South Korea. Although Ballasted railway track structures are one of the most common track structures in the railway industry, they have some drawbacks including higher maintenance cost, un-uniform supports, and a high level of noise and vibration. However, a ballastless (slab-based) track structure system requires less maintenance and uniform support conditions, as well as several ballastless structure systems developed for high-speed trains. The Seoul Metro subway in South Korea has developed a ballastless reinforced concrete (RC) slab railway system using a type of conventional concrete. This study presents a ballastless precast concrete slab using a newly developed eco-friendly concrete, which can significantly improve structural performances and the manufacturability of a railway track structure system. This study evaluates the field performance of the eco-friendly concrete slab system deployed in one of the existing tunnel sections of the Seoul Metro subway system. A total of 10 m long slab sections including a 5 m long eco-friendly “ballasted track to slab track (B2S)” panels section and a 5 m long conventional B2S panels section are installed and monitored side by side. Field tests are performed to measure the level of noise, vibration, dynamic wheel load, rail displacement, and rail stress. The field measurements from the eco-friendly B2S section are compared to those of the conventional reinforced concrete slab track systems. The results show that the performance of the new B2S system using the eco-friendly concrete is comparable and/or superior to the conventional system.
49
Toshin, Dmitry S., and Dmitry A. Dolgopolov. "Strength, stiffness and crack resistance of a lightweight slab structure model with spherical void formers." Urban construction and architecture 13, no. 1 (2023): 10–16. http://dx.doi.org/10.17673/vestnik.2023.01.02.
Full textAbstract:
Precast concrete has been used for many decades with optimized consumption of concrete and reinforcement. The use of monolithic reinforced concrete in the Russian Federation cannot be called balanced in terms of its material consumption. One of the design ideas for creating lightweight slab reinforced concrete structures in monolithic construction is the BubbleDeck technology. Spherical bushings are located in places of the least stresses in the structure, which leads to a significant reduction in the own weight. The article presents the results of assessing the strength, stiffness and crack resistance of a reduced model of a reinforced concrete slab in comparison with similar parameters of a solid section slab.
50
Kim, Seungho, Dong-Eun Lee, Yonggu Kim, and Sangyong Kim. "Development and Application of Precast Concrete Double Wall System to Improve Productivity of Retaining Wall Construction." Sustainability 12, no. 8 (2020): 3454. http://dx.doi.org/10.3390/su12083454.
Full textAbstract:
The construction of most apartment underground parking lots utilizes reinforced concrete (RC) structures composed mainly of rebar work and formwork. RC structures lower construction efficiency and significantly delay the construction because they require a large number of temporary materials and wooden formwork. In this study, a precast concrete double wall (PCDW) system was developed to address the existing problems of RC structures and to improve the productivity of retaining wall construction. PCDW is a precast concrete (PC) wall in which two thin concrete panels are connected parallel to each other with truss-shaped reinforcement between them. PCDW can contribute to securing integrity, reducing the delay in construction, and improving quality. An overall process for the member design and construction stage of the PCDW system was proposed, and its improvement effects were examined regarding various aspects in comparison to the RC method.