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1
Makki, Ragheed, Haider Al-Katib, and Ahmed Alalikhan. "Load-defl ection behaviour of hybrid concrete flat slab." Przegląd Naukowy Inżynieria i Kształtowanie Środowiska 28, no. 4 (December 29, 2019): 516–25. http://dx.doi.org/10.22630/pniks.2019.28.4.47.
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Due to the important role of high strength concrete in the structural systems, present work focuses on the use of this material as a strengthening technique incorporating with the normal strength concrete in flat slab system. Eight simply supported flat slab models with (1,000 × 1,000 × 120 mm) dimensions are investigated based on three groups including normal strength concrete and high strength concrete. The first group represents models containing of two flat slabs fully with one type of concrete; NSC and HSC as control flat slab. The second and third groups consist of six flat slabs as hybrid flat slabs of two layer of concrete with different thicknesses. Concrete mixture HSC was used in tension zone in three hybrid flat slabs (second group) with three thicknesses (30, 60 and 90 mm), while the remaining three hybrid flat slabs (third group) was used the HSC in compression zone with the same previous thicknesses. The experimental results shown that the ultimate load increased about (19.4%) when HSC was used fully (hH / h = 1) instead of using NSC in the control flat slab (NSC slab). The hybrid flat slabs with use HSC in compression zone showed higher in cracking and ultimate flexural loads compared with those of the hybrid flat slabs with use HSC in tension zone and also were stiffer in load-defl ection curve with the hybrid flat slabs with HSC in tension zone, also the hybrid flat slabs showed an improvement in the cracking load and ultimate flexural load when increasing the thickness of the HSC layer (hH / h) in both tension and compression zone as compared to control flat slab (NSC slab).
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singh, Akshansh, Vinayak mishra, and R. P. Singh. "Study of a Flat Slab Building with a Shear Wall at Core and X-Bracing." IOP Conference Series: Materials Science and Engineering 1273, no. 1 (January 1, 2023): 012004. http://dx.doi.org/10.1088/1757-899x/1273/1/012004.
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Abstract Construction with flat slabs is quite dangerous when there is strong earthquake shaking. Two different forms of flat slab buildings—flat slab with shear wall at core and flat slab with x-bracing—are considered in the study. These flat slab constructions’ structural rigidity is increased by this lateral force-resisting mechanism. It has been found that adding a shear wall considerably boosts the flat slab structure’s ability to withstand lateral forces.
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Liu, Xiaowen, Claire A. Currie, and Lara S. Wagner. "Cooling of the continental plate during flat-slab subduction." Geosphere 18, no. 1 (December 22, 2021): 49–68. http://dx.doi.org/10.1130/ges02402.1.
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Abstract Most flat-slab subduction regions are marked by an absence of arc volcanism, which is consistent with closure of the hot mantle wedge as the subducting plate flattens below the continent. Farther inland, low surface heat flow is observed, which is generally attributed to cooling of the continent by the underlying flat slab. However, modern flat slabs have only been in place for <20 Ma, and it is unclear whether there has been sufficient time for cooling to occur. We use numerical models to assess temporal variations in continental thermal structure during flat-slab subduction. Our models show that the flat slab leads to continental cooling on timescales of tens of millions of years. Cool slab temperatures must diffuse through the continental lithosphere, resulting in a delay between slab emplacement and surface cooling. Therefore, the timescales primarily depend on the flat-slab depth with shallower slabs resulting in shorter timescales. The magnitude of cooling increases for a shallow or long-lived flat slab, old subducting plate, and fast convergence rates. For regions with flat slabs at 45–70 km depth (e.g., Mexico and Peru), shallow continental cooling initiates 5–10 Ma after slab emplacement, and low surface heat flow in these regions is largely explained by the presence of the flat slab. However, for the Pampean region in Chile, with an ~100-km-deep slab, our models predict that conductive cooling has not yet affected the surface heat flow. The low heat flow observed requires additional processes such as advective cooling from the infiltration of fluids released through dehydration of the flat slab.
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Satwika, Vanteddu, and Mohit Jaiswal. "Comparison of RCC and Post-Tensioned Flat Slabs Using ETABS." IOP Conference Series: Earth and Environmental Science 982, no. 1 (March 1, 2022): 012084. http://dx.doi.org/10.1088/1755-1315/982/1/012084.
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Abstract Flat slabs are widely used nowadays. The system’s insufficient punching shear capacity is a major and serious flaw. There are numerous approaches to increasing the punching shear strength of concrete slabs to solve the problem of punching failure. Increasing the thickness of the slab adjacent to the column, as well as the thickness of the column, contradicts the architectural intent. In developing countries such as India, the benefits of prestressing, particularly post-tensioning, have yet to be recognized. In this study, the technique of post-tensioning is used to strengthen a flat slab. RCC flat slabs are compared to post-tensioned flab slabs with different tendon profiles. Tendons are available in two forms: distributed and banded. The models were built as per ACI 318-14. These slab models were created using ETABS software, and the following parameters were compared: thickness, supporting reactions, punching shear, and deflection. When compared to traditional flat slabs. The results indicate that post-tensioned flat slabs have a higher punching shear capacity even at shallower depths, resulting in more cost-effective sections. The provision of tendons also results in lower deflection.
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Ahmad, Omar. "Financial comparative study between post-tensioned and reinforced concrete flat slab." International Journal of Advanced Engineering, Sciences and Applications 3, no. 1 (January 31, 2022): 1–6. http://dx.doi.org/10.47346/ijaesa.v3i1.67.
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As for today, post-tensioned slabs gained much popularity and started to be widely used among construction companies all around the world. As we refer to the structural members, we acknowledge that the price of the slab is much higher in comparison to the other structural members like columns, beams, or foundation in accordance to the amount of steel and concrete in it. A comparative study has been done between post-tensioned, and reinforced concrete flat slab to compare how much each slab cost. It describes that since the post-tension slabs are thinner and it provides fewer columns, so the amount of concrete required is less than the required amount in a flat slab. Special steel tendons that are used in post-tensioned slabs will be stretched by a hydraulic jack after the casting of concrete, and these tendons have an effect in reducing the reinforcement steel bars. Although tendons are used only in post-tension slabs, the amount of steel used in it is less compared to flat slabs. Furthermore, the contractor work cost differs from doing the post-tensioned slab and flat slab. The study had been done by comparing the amount of concrete, steel and contractor work cost. The results obtained from the comparative study between post-tension slabs and reinforcement concrete flat slabs indicate that post-tensioned slabs are cheaper.
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Schellart, W. P., and V. Strak. "Geodynamic models of short-lived, long-lived and periodic flat slab subduction." Geophysical Journal International 226, no. 3 (April 1, 2021): 1517–41. http://dx.doi.org/10.1093/gji/ggab126.
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SUMMARY Flat slab subduction has been ascribed to a variety of causes, including subduction of buoyant ridges/plateaus and forced trench retreat. The former, however, has irregular spatial correlations with flat slabs, while the latter has required external forcing in geodynamic subduction models, which might be insufficient or absent in nature. In this paper, we present buoyancy-driven numerical geodynamic models and aim to investigate flat slab subduction in the absence of external forcing as well as test the influence of overriding plate strength, subducting plate thickness, inclusion/exclusion of an oceanic plateau and lower mantle viscosity on flat slab formation and its evolution. Flat slab subduction is reproduced during normal oceanic subduction in the absence of ridge/plateau subduction and without externally forced plate motion. Subduction of a plateau-like feature, in this buoyancy-driven setting, enhances slab steepening. In models that produce flat slab subduction, it only commences after a prolonged period of slab dip angle reduction during lower mantle slab penetration. The flat slab is supported by mantle wedge suction, vertical compressive stresses at the base of the slab and upper mantle slab buckling stresses. Our models demonstrate three modes of flat slab subduction, namely short-lived (transient) flat slab subduction, long-lived flat slab subduction and periodic flat slab subduction, which occur for different model parameter combinations. Most models demonstrate slab folding at the 660 km discontinuity, which produces periodic changes in the upper mantle slab dip angle. With relatively high overriding plate strength or large subducting plate thickness, such folding results in periodic changes in the dip angle of the flat slab segment, which can lead to periodic flat slab subduction, providing a potential explanation for periodic arc migration. Flat slab subduction ends due to the local overriding plate shortening and thickening it produces, which forces mantle wedge opening and a reduction in mantle wedge suction. As overriding plate strength controls the shortening rate, it has a strong control on the duration of flat slab subduction, which increases with increasing strength. For the weakest overriding plate, flat slab subduction is short-lived and lasts only 6 Myr, while for the strongest overriding plate flat slab subduction is long-lived and exceeds 75 Myr. Progressive overriding plate shortening during flat slab subduction might explain why flat slab subduction terminated in the Eocene in western North America and in the Jurassic in South China.
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Sawwalakhe, Abhijit K., and Prabodh D. Pachpor. "Comparative Study Of Conventional Slab, Flat Slab And Grid Slab Using ETABS." IOP Conference Series: Materials Science and Engineering 1197, no. 1 (November 1, 2021): 012020. http://dx.doi.org/10.1088/1757-899x/1197/1/012020.
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Abstract In today’s construction, the traditional slab is mostly supported by a beam, with a small slab thickness and a large beam depth, and the weight is carried from beam to column. The flat slab allows architects to place partition walls wherever they are needed. It is widely used because it reduces weight, speeds up building, and is cost effective. Similarly, since its inception, the conventional slab has provided benefits such as increased stiffness, increased weight carrying ability, as well as being safe and cost effective. Grid slabs are necessary where the span is greater, and grid beams are provided to lessen the spanning. Grid slabs reduce dead load due to voids and are appropriate for longer spans with heavy loads. The Grid slab is less expensive and provides superior vibration resistance. The project’s goal is to find the most cost-effective slab among standard slab, flat slab with drop, and grid slab. A G+5 Commercial multi-story structure with flat slab, conventional slab, and gird slab was investigated for characteristics such as storey displacement, shear force, bending moment, and storey drift in this study. There are a total of 18 structures examined. The performance and behaviour of all structures in India’s seismic zone III have been investigated with the application of dead load, live load and seismic load. The results of shear force, Bending Moment, story shear, story displacement, story drift and quantity of concrete and steel shows that the overall result values makes flat slab a suitable structure as compared to the conventional and grid slab.
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Muhammed, Twana Ali, and Dr Ferhad Rahim Karim. "The Influence of Drop Panel's Dimensions on the Punching Shear Resistance in Ultra-High-Performance Fiber-Reinforced Concrete Flat Slabs." CONSTRUCTION 2, no. 1 (May 18, 2022): 55–65. http://dx.doi.org/10.15282/construction.v2i1.7581.
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Ultra-high performance fiber reinforced concrete (UHPFRC) is a high-performance cementitious material with enhanced tension, compression, and toughness, strengths in the post crack region with high ductility, toughness, and durability. The companies prefer to use it to construct highly durable structures such as high-rise buildings, towers, and bridges. In addition, the thickness of the flat slab produced by UHPFRC might be thinner than the conventional concrete. One problem that has always been a concern in a flat slab is the punching shear failure since this failure is brittle and occurs suddenly without any previous notice. Besides, the position of the critical section for punching shear could be changed based on the thickness of the drop panel and the inclusion of fiber in the concrete. This paper highlights the effect of drop panels dimension on the punching shear resistance in UHPFRC flat slabs. The four two-way interior UHPFRC supported flat slab panels, consisting of one control flat slab without drop panels and three-flat slabs with different sizes of drop panels (10.5%,14.5%, and 19%) of the total area of slab drop panels, tested under punching load. Results indicated that the covered area of flat slabs by drop panel around 10.5% improved punching load up to %20 and 37% at the crack and ultimate loads. Furthermore, the test results show that the efficient covered area for resisting punching was 10.5% of the total area of the tested slab. Besides, the deflection values, strain in reinforcement and concrete, rotation at supports, and the inclination angles of cracks were improved due to the stiffness enhancement in the flat slabs.
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Fillo, Ľudovít, Tomáš Augustín, Andrej Bartók, and Ondrej Keseli. "Resistance of Flat Slabs with Openings." Solid State Phenomena 259 (May 2017): 209–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.209.
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Flat slabs - locally supported slabs are an important and preferred type of modern buildings structures. The column – slab contact point has the concentration of compression but especially shear and tensile stresses which may cause sudden failure – punching of slabs. The paper deals with the analysis of flat slab sample with two openings near the column - the typical example of real structures. The results are presented only for one size and location of openings. Material properties for analysis were obtained from experimental work carried out at the Department of Concrete Structures at STU in Bratislava. The phenomenon of the punching was calculated according EN1992 and Model Code 2010, and also numerically analyzed by nonlinear methods based on the finite element method. Results of these processes of resistance determination are compared separately for flat slab without and with openings.
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Abd Al-Zahra, Bilal Ismaeel, Maitham Alwash, Ameer Baiee, and Ali A. Shubbar. "Limitations on ACI Code Minimum Thickness Requirements for Flat Slab." Civil Engineering Journal 7, no. 11 (November 1, 2021): 1918–32. http://dx.doi.org/10.28991/cej-2021-03091769.
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Reinforced concrete two-way flat slabs are considered one of the most used systems in the construction of commercial buildings due to the ease of construction and suitability for electrical and mechanical paths. Long-term deflection is an essential parameter in controlling the behavior of this slab system, especially with long spans. Therefore, this study is devoted to investigating the validation of the ACI 318-19 Code long-term deflection limitations of a wide range of span lengths of two-way flat slabs with and without drop panels. The first part of the study includes nonlinear finite element analysis of 63 flat slabs without drops and 63 flat slabs with drops using the SAFE commercial software. The investigated parameters consist of the span length (4, 5, 6, 7, 8, 9, and 10m), compressive strength of concrete (21, 35, and 49 MPa), the magnitude of live load (1.5, 3, and 4.5 kN/m2), and the drop thickness (0.25tslab, 0.5tslab, and 0.75tslab). In addition, the maximum crack width at the top and bottom are determined and compared with the limitations of the ACI 224R-08. The second part of this research proposes modifications to the minimum slab thickness that satisfy the permissible deflection. It was found, for flat slabs without drops, the increase in concrete compressive strength from 21MPa to 49MPa decreases the average long-term deflection by (56, 53, 50, 44, 39, 33 and 31%) for spans (4, 5, 6, 7, 8, 9, and 10 m) respectively. In flat slab with drop panel, it was found that varying drop panel thickness t2 from 0.25 to 0.75 decreases the average long-term deflection by (45, 41, 39, 35, 31, 28 and 25%) for span lengths (4, 5, 6, 7, 8, 9 and 10 m) respectively. Limitations of the minimum thickness of flat slab were proposed to vary from Ln/30 to Ln/19.9 for a flat slab without a drop panel and from Ln/33 to Ln/21.2 for a flat slab with drop panel. These limitations demonstrated high consistency with the results of Scanlon and Lee's unified equation for determining the minimum thickness of slab with and without drop panels. Doi: 10.28991/cej-2021-03091769 Full Text: PDF
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Han, Jin Sheng, and Shu Ping Cong. "Internal Force and Deflection Calculation of a Kind of Cellular Hollow Flat Slab Floor." Applied Mechanics and Materials 94-96 (September 2011): 67–72. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.67.
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The structural form of a kind of cellular hollow flat slab floor using thin wall plastic boxes was introduced. The equivalent frame method, which was used to analyze the internal force of this kind of cellular hollow flat slab floor, was discussed. Finally, the method to calculate the deflection of cellular hollow flat slab was investigated and some improvements in this method were presented. The effects of the cracks on the stiffness and deflection of hollow flat slabs were taken into account in this method to decrease the error of elasticity calculation results.
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Gong, Mosong, Bowen Yang, Zhengrong Jiang, and Huishan Mo. "Comparative Analysis of Mechanical Performance of Flat Slabs with Reverse and Conventional Column Caps." Buildings 12, no. 8 (August 1, 2022): 1139. http://dx.doi.org/10.3390/buildings12081139.
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Compared with the conventional column caps, the reverse column caps that are used for slab-column joint of basement roof can improve the clearance of the basement while ensuring structural safety, and they are hidden in the covering soil without affecting the appearance and use of upper surface of flat slabs. In this paper, four finite element models, which are loaded by column-end displacement-control mechanism, are established. These models are used to investigate the mechanical performance of slab-column joint for flat slabs with reverse and conventional column caps. The obtained numerical results were thoroughly analysed, indicating that the load-carrying capacity performances of flat slabs with conventional column caps are much higher than their counterparts with reverse column caps, but flat slabs with conventional column caps possess lower mechanical ductility. Moreover, the reverse column caps were found to exhibit a severe damage at ultimate load; therefore, transverse stirrups were distributed into the reverse and conventional column caps for the purpose of comparison. The comparison results revealed that the ultimate load of the slab-column joints with reverse column cap can be increased by 2.4% by arranging transverse stirrups in column cap, but the ductility is decreased by 13.4%. For the slab-column joints with conventional column cap, the ultimate load is decreased by 10.0% and the ductility is decreased by 1.6% when transverse stirrups are arranged in column cap. Therefore, arrangement of transverse stirrups in column cap should be determined based on the actual situation in the flat slab system with reverse column cap, and it is not recommended to arrange transverse stirrups in column cap in the flat slab system with conventional column cap.
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Guan, Hong, and Yew-Chaye Loo. "Flexural and Shear Failure Analysis of Reinforced Concrete Slabs and Flat Plates." Advances in Structural Engineering 1, no. 1 (January 1997): 71–85. http://dx.doi.org/10.1177/136943329700100108.
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A nonlinear layered finite element procedure is presented for flexural and shear failure analysis of reinforced concrete slabs and flat plates. A degenerated shell element employing a layered discretization scheme is adopted. This provides a simple and effective means of accounting for the nonlinear behaviour of concrete and steel reinforcement over the thickness of the slab or flat plate. The procedure is capable of determining the load-deflection response, the ultimate load capacity and crack patterns of concrete slab structures, as well as computing the punching shear strength at slab-column connections of concrete flat plates. To verify the accuracy and reliability of the proposed method of analysis, comparative studies are carried out on a collection of reinforced concrete slabs, single slab-column connections and multi-column flat plates which were tested by other researchers. In general, good correlations are obtained with the published test results.
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A. Alwash, Nameer, and Fatimah H. Naser Al-Mamoori. "Behavior of The RC Slab-Beam System Using Self Compacting Concrete." International Journal of Engineering & Technology 7, no. 4.20 (November 28, 2018): 507. http://dx.doi.org/10.14419/ijet.v7i4.20.26252.
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The present study includes an experimental investigation of the behavior of square reinforced concrete slabs. These slabs are with and without edge beams under uniformly distributed load with corner supports using two types of self compacting concrete (SCC), the first type of SCC incorporated limestone filler and the other was without filler, the results obtained are compared with those obtained from conventional concrete (CC).The experimental program consists of testing nine square slab samples. Three of these slab samples are flat in shape with panel dimensions of 1050×1050×50 mm depth. The others three slab samples are of the same outer dimensions with surrounding edge beams of depth to slab thickness equal 100/50 and 100 mm width. The last three slab samples are similar to the former slab-beam systems but with increasing the depth of edge beams by 50%.In general, for a specified flat plate panel, the ultimate load carrying capacity can be increased, if the panel is restricted by four surrounding beams. The slab-beam samples with surrounding beams of depth to slab thickness equal to 3 showed greater ultimate load capacity by about 79.37%, 52% and 97.82% when compared with the corresponding flat slabs samples produced using CC, SCC with and without filler, respectively.
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Fillo, Ľudovít, Jaroslav Halvonik, and Viktor Borzovič. "Punching of Concrete Flat and Foundation Slabs." Transactions of the VŠB – Technical University of Ostrava, Civil Engineering Series. 14, no. 1 (June 1, 2014): 1–7. http://dx.doi.org/10.2478/tvsb-2014-0001.
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Abstract This paper deals with punching of flat and foundation slabs. Te paper presents limiting values of maximum punching resistance of these slab structures with sudden and brittle mode of failure. In the paper are introduced graphs for design of flat and foundation slab thickness depending on load intensity, span length and reinforcement ratio.
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Rupidara, Yohanes Alexander, Remigildus Cornelis, and Tri M. W. Sir. "Analisis Perbandingan Kinerja Seismik dari Struktur Gedung dengan Pelat Konvensional, Waffle Slab, dan Flat Slab." JURNAL FORUM TEKNIK SIPIL (J-ForTekS) 2, no. 1 (May 28, 2022): 80–91. http://dx.doi.org/10.35508/forteks.v2i1.5496.
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Indonesia is a country with high earthquake risk because it is located in the path of the most active earthquake in the world. It makes Indonesia situated in a region with a high earthquake intensity. The study aimed to determine the seismic performance levels of building structures with conventional slabs, waffle slabs, and flat slabs with the time history analysis method. There are three models of structures studied, namely building structures with conventional plates, building structures with waffle slabs, and building structures with flat slabs, with a 5-story structure system, where the longest and shortest span has the same size of 20 m and the height of each level 4 m. This study showed the largest displacement was 235.82 mm in building structures with waffle slabs and the smallest displacement was 146.49 mm in building structures with flat slabs. The largest drift is 0.012 on a building structure with a waffle slab, and the smallest drift is 0.007 on a building structure with a flat slab. The level of seismic performance produced from all three types of structures varies from immediate occupancy (IO) to damage control (DC).
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Sherif, Alaa G., and Walter H. Dilger. "Analysis and deflections of reinforced concrete flat slabs." Canadian Journal of Civil Engineering 25, no. 3 (June 1, 1998): 451–66. http://dx.doi.org/10.1139/l97-102.
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The results of a test on a full-scale 5 m continuous slab are used to study the methods of analysis and calculation of deflection of reinforced concrete flat slabs. The most commonly used methods for the analysis of flat slabs, namely the equivalent frame method, the prismatic member method, the direct design method, and the finite element method, are critically compared using the results of the slab tested. Based on the comparison with the unbalanced column moments in the test, improvements for the prismatic member method are suggested. For the deflection calculations of cracked reinforced concrete flexural members, three methods are investigated: the effective moment of inertia approach, the mean curvature approach, and the bilinear method given in the CEB manual for deflections. To calculate the deflections of flat slabs as column and field strip deflections, new coefficients for distributing the bending moments between the column and middle strips are proposed.Key words: analysis, deflection, flat concrete slab, test.
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Pandey, Manish Kumar. "Seismic Response of Large span slab in Horizontal Setback Building: A Review." International Journal for Research in Applied Science and Engineering Technology 9, no. 10 (October 31, 2021): 508–14. http://dx.doi.org/10.22214/ijraset.2021.38452.
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Abstract: The demand of multistory Building is increases day by day. The residential plus commercial building predominantly used for the need of large span. The large span is needed for Flat slab, Waffle slabs & ribbed slab stands as an excellent option for architects when larger spans in a building has to be covered with the least possible number of columns. The use of different types slabs are evolving as a new trend and are becoming a big challenge for structural engineers. Therefore it is necessary to study about its structural behavior. The paper is review the behavior of different types slab for large span type of building. Final aim to gets the suitable type of slab for large span for effective manner. It is found that very less work is taken setback building with large span, it is required to analysis on the setback building with large span. Keywords: Flat slab, Waffle slabs, ribbed slab, multistory Building, large span.
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Mohamed, Osama Ahmed, Manish Kewalramani, and Rania Khattab. "Fiber Reinforced Polymer Laminates for Strengthening of RC Slabs against Punching Shear: A Review." Polymers 12, no. 3 (March 19, 2020): 685. http://dx.doi.org/10.3390/polym12030685.
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Reinforced concrete flat slabs or flat plates continue to be among the most popular floor systems due to speed of construction and inherent flexibility it offers in relation to locations of partitions. However, flat slab/plate floor systems that are deficient in two-way shear strength are susceptible to brittle failure at a slab–column junction that may propagate and lead to progressive collapse of a larger segment of the structural system. Deficiency in two-way shear strength may be due to design/construction errors, material under-strength, or overload. Fiber reinforced polymer (FRP) composite laminates in the form of sheets and/or strips are used in structurally deficient flat slab systems to enhance the two-way shear capacity, flexural strength, stiffness, and ductility. Glass FRP (GFRP) has been used successfully but carbon FRP (CFRP) sheets/strips/laminates are more commonly used as a practical alternative to other expensive and/or challenging methods such column enlargement. This article reviews the literature on the methodology and effectiveness of utilizing FRP sheets/strips and laminates at the column/slab intersection to enhance punching shear strength of flat slabs.
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Megally, Sami, and Amin Ghali. "Seismic behavior of slab-column connections." Canadian Journal of Civil Engineering 27, no. 1 (February 15, 2000): 84–100. http://dx.doi.org/10.1139/l99-052.
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Brittle punching failure of flat plates can occur as a result of transfer of shearing forces and unbalanced moments between slabs and columns. During an earthquake, the unbalanced moments transferred between slabs and columns can produce significant shear stresses that increase the likelihood of brittle failure. This brittle punching failure mode must be avoided for seismic-resistant flat plate structures. The most common punching strengthening methods are provision of the slab-column connections with drop panels or shear reinforcement or use of high strength concrete in the slab at the vicinity of the connections. This paper compares the effect of these punching strengthening methods on the ductility of slab-column connections. The results of a part of an extensive experimental program conducted on edge slab-column connections, without and with shear reinforcement, are presented. The experiments show that provision of stud shear reinforcement results in seismic-resistant slab-column connections, in which brittle punching failure is avoided in severe earthquakes. The connections with stud shear reinforcement can undergo ductile deformations associated with up to 5% lateral interstorey drift ratio, without loss of resistance to punching due to gravity loads. Key words: concrete design, ductility, energy dissipation, flat slabs, lateral drift, moment transfer, punching, seismic, shear strength, slab-column connections, stiffness, stud shear reinforcement.
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Abbas, Abdulnasser M., Haleem K. Hussain, and Mohammed Farhan Ojaimi. "Shear and Flexural Behavior of Flat Slabs Casted with Polyolefin Fiber-Reinforced Concrete." Fibers 10, no. 4 (April 12, 2022): 34. http://dx.doi.org/10.3390/fib10040034.
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This paper presents the influence of polyolefin fiber on the flexural and shear attitude on the flat slabs. Three slab sets (80 cm × 80 cm) were tested, each with a thickness of 10 cm. In the first set (S1), the effect of fiber content on the flexural behavior of the flat slab was considered. Therefore, four slab specimens were cast, one of which was considered as a control specimen with no fiber content, while the other three included fibers at 0.5, 1, and 1.5 percent of the total concrete volume. The second series of experiments studied the flexural behavior of flat slabs (S2) with an opening of 15 cm × 15 cm. The first specimen contained nil polyolefin, while the second included 1% polyolefin. In the third set (S3), consideration was taken for 0 and 1% of Polyolefin to realize the shear behavior of the flat slab. The increase in polyolefin fiber content from 0 to 1.5% (for slab set 1) will decrease the deflection from 4.5 mm to 2.3 mm, with an average of 3.58 mm, which is close to the deflection of a 1% polyolefin fiber specimen. Three dimensional models for the tested slabs were simulated numerically via ABAQUS software program. The ratio of the maximum deflection between the experimental and the numerical outcomes were varied with a range of 1.01 to 1.28, with an average of 1.14.
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Augustín, Tomáš, Ľudovít Fillo, Jaroslav Halvonik, and Marián Marčiš. "Punching Resistance of Flat Slabs with Openings – Experimental Investigation." Solid State Phenomena 272 (February 2018): 41–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.272.41.
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Flat slabs are commonly used structures in contemporary architecture. Although their common use there is still problem in design of these structures. The openings adjacent to a column are often used for plumbing and such a position of the openings increases shear stresses in the flat slab near the column. This paper deals with experimental work focused on the punching shear resistance of the flat slab specimens with openings adjacent to column compared to the flat slab specimens without openings. The opening influence is determined experimentally and by using models for the assessment of punching resistance from relevant standards and codes. The material properties of concrete and reinforcing steel were obtained from the laboratory tests.
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Bolešová, Mária, Katarína Gajdošová, and Marek Čuhák. "Reconstruction Effectiveness of Locally Supported Flat Slabs to Increase in Shear Resistance." Solid State Phenomena 309 (August 2020): 246–51. http://dx.doi.org/10.4028/www.scientific.net/ssp.309.246.
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The most used horizontal load-bearing systems in concrete buildings are flat slabs. The effective and economic reconstruction of a locally supported flat slab of an existing building creates a complex task. Shear stress arises near the column and it becomes critical in design with increasing slab slenderness and requires a more detailed calculation. Increasing in the shear resistance of the flat slab can be achieved in various ways. Each method brings different effectiveness, advantages and disadvantages. The most widely used methods of the reconstruction are the increase in the size of the column (therein increasing the control perimeter for displaying the shear stress), the increase in the thickness of the flat slab or reinforcing the slab with shear reinforcement. Bolts and screw anchors (using different mounting angles) can be used as shear reinforcement. Each mentioned reconstruction method should be subjected to numerical calculations and verification of its efficiency. The parametric study presented in this paper is focused on the reconstruction techniques and their verification according to various numerical models. The results from Eurocode 2, fib Model Code 2010 and the new generation of Eurocode 2 are compared to show the differences between them. The aim of this paper is to bring a demonstration of the reconstruction methods that will increase in the shear resistance of the locally supported flat slabs and trying to choose the most effective one.
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Guan, Hong, and Yew-Chaye Loo. "Failure analysis of columnslab connections with stud shear reinforcement." Canadian Journal of Civil Engineering 30, no. 5 (October 1, 2003): 934–44. http://dx.doi.org/10.1139/l03-058.
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The design of a flat plate structure is generally governed either by serviceability limits on deflection or punching shear strength of the columnslab connections. To increase the strength of a columnslab connection, a new type of shear reinforcement, referred to as shear stud, is gaining popularity in practice. In this paper, a nonlinear layered finite element method (LFEM) is used to investigate the effectiveness of the shear studs in increasing the punching shear strength of edge and corner columnslab connections. In total, nine large-scale reinforced concrete slabs of a flat plate floor in the vicinity of edge and corner columns, tested previously in the laboratory, are analysed. All the slabs contained stud shear reinforcement (SSR) except a control slab where no SSR was provided. The test variables were the column size and the ratio of stud spacing to slab thickness. The punching shear strengths, loaddeflection responses, and crack patterns predicted by the LFEM are compared with the experimental results. The numerical investigation confirms the accuracy and effectiveness of the LFEM in predicting the strength of columnslab connections with SSR.Key words: columnslab connection, concrete flat plate, punching shear, stud shear reinforcement, finite element analysis.
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Muttoni, A., D. Coronelli, M. Lamperti Tornaghi, L. Martinelli, I. R. Pascu, A. Pinho Ramos, G. Tsionis, P. Bamonte, B. Isufi, and A. Setiawan. "Deformation capacity evaluation for flat slab seismic design." Bulletin of Earthquake Engineering 20, no. 3 (January 28, 2022): 1619–54. http://dx.doi.org/10.1007/s10518-021-01302-x.
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AbstractIn flat-slab frames, which are typically designed as secondary seismic structures, the shear failure of the slab around the column (punching failure) is typically the governing failure mode which limits the deformation capacity and can potentially lead to a progressive collapse of the structure. Existing rules to predict the capacity of flat slab frames to resist imposed lateral displacements without losing the capability to bear gravity loads have been derived empirically from the results of cyclic tests on thin members. These rules account explicitly only for the ratio between acting gravity loads and resistance against concentric punching shear (so-called Gravity Shear Ratio). Recent rational models to estimate the deformation capacity of flat slabs show that other parameters can play a major role and predict a significant size effect (reduced deformation for thick slabs). In this paper, a closed-form expression to predict the deformation capacity of internal slab-column connections as a function of the main parameters is derived from the same model that has been used to develop the punching shear formulae for the second generation of Eurocode 2 for concrete structures. This expression is compared to an existing database of isolated internal slab-column connections showing fine accuracy and allowing to resolve the shortcomings of existing rules. In addition, the results of a testing programme on a full-scale flat-slab frame with two stories and 12 columns are described. The differences between measured interstorey drifts and local slab rotations influencing their capacity to resist shear forces are presented and discussed. With respect to the observed deformation capacities, similar values are obtained as in the isolated specimens and the predictions are confirmed for the internal columns, but significant differences are observed between internal, edge and corner slab-column connections. The effects of punching shear reinforcement and of integrity reinforcement (required according to Eurocode 2 to prevent progressive collapse after punching) are also discussed.
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Ali H. Aziz. "PUNCHING SHEAR AND FLEXURAL STRENGTHS OF SELF COMPACTED CONCRETE NON-RECTANGULAR SHAPED FLAT PLATE SLABS." Diyala Journal of Engineering Sciences 4, no. 1 (June 1, 2011): 95–107. http://dx.doi.org/10.24237/djes.2011.04107.
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This study is conducted to investigate experimentally the punching shear and flexural strengths of reinforced concrete flat plate slabs made with Non-Rectangular (triangular and trapezoidal) shaped. Four test self-compacting concrete slab groups were manufactured, each of which consisted of three slab specimens identical in size and shape but different in constituent’s properties. All slabs are simply supported along the all edges and subjected to single point load applied at the center of gravity of each slab.
Experimental results shows that the use of self compacting concrete improves the punching shear resistance and allows higher forces to be transferred through the slab-column connection. For slabs which were designed to fail in punching shear, the ultimate capacity of the tested specimens increased by (7%) to (20%) when the shape of slab specimens changed from triangular to trapezoidal. In contrast of slabs which were designed to fail in flexure, the ultimate capacity of the tested specimens increased from (16%) to (58%) when the shape of slab specimens changed from triangular to trapezoidal.
The cracking load depends essentially on concrete strength and not on slab configuration, but, the ultimate capacity depends on both, concrete strength and shape of slab.
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Helal, Rawnaq Abbas, Haider M. Al-Baghdadi, and Nabeel Hasan Ali Al-Salim. "Using Mortar Infiltrated Fiber Concrete as Repairing Materials for Flat Slabs." Civil Engineering Journal 6, no. 10 (October 1, 2020): 1956–73. http://dx.doi.org/10.28991/cej-2020-03091595.
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This search aims to study and test the effect of using a new material (mortar infiltrated fiber concrete) as repair material in crucial regions that need a special type of repair like (deck of bridges, pavements, and defense structures). This work consisted of three stages: the first stage; testing the engineering properties of slurry infiltrated fiber concrete (compressive, splitting tensile, flexural and bond strengths), by using different types of fibers (End hooked steel fiber, Micro steel fiber, Polypropylene fiber, and Synthetic fiber), in five different types of mortar infiltrated fiber concrete mixes (with a volumetric ratio of fiber 6%), and the age of test was 28 days. After studying the behavior of these mixes in these tests, the second stage of this study was concluded casting reference slab with dimensions 900×900×80 mm from normal strength concrete and repairing two sets of damaged slabs (with dimensions 900×900×50 mm, the first set consist of five slabs damaged in the compression zone, and the second set consist of five slabs damaged in tension zone), the two sets repaired with repair layer from mortar infiltrated fiber concrete with thickness 30 mm. The third stage of the study was testing the effect of the repair material (mortar infiltrated fiber concrete) on the flexural behavior of the repaired slab specimens in (flexural strength, deflection characteristics, and ductility), through using a hydraulic jack with a four-point load system. The results of testing slab specimens indicated significant improvement in the flexural behavior of the repaired slab when compared with the reference slab, the slabs repaired in the compression zone recorded increasing in range 2-39% in ultimate load and the slabs that repaired in tension zone recorded 4-71% increasing in ultimate load .also recorded better deflection values through testing the slabs specimens that repaired. The ductility of the repaired slab specimens increased significantly from 25 to 91% compared with the reference slab specimens. These results indicated excellent effect mortar infiltrated fiber concrete as a perfect repair material for slabs that damaged in compression and tension zones.
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Zhang, Jing Shu, Huan Huan Nie, Yuan Long Yang, and Yuan Yao. "Research and Application of Pre-Stressed Concrete Composite Slabs." Applied Mechanics and Materials 166-169 (May 2012): 131–39. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.131.
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The pre-stressed concrete composite slab, which combines the advantages of cast-in-place slabs and precast slabs, has promising development prospects. In the paper, according to structural integrity, bond performance, sound insulation, thermal preservation and construction techniques, four categories composite slab, such as the composite slab with flat bottom panel (including the composite slab with bar truss reinforced precast concrete bottom panel), the concrete composite slab with precast ribbed panel, the composite slab with hollow bottom panel and the composite slab with sandwich bottom panel are studied. The composite slab with flat bottom panel has poor structural integrity, and its bond performance and crack resistance of edge joint details need to be improved; the composite slab with bar truss reinforced precast concrete bottom panel has enough bond force, but its storage and transportation are inconvenient; the concrete composite slab with precast ribbed panel has good structural integrity and convenient construction procedure; the composite slab with hollow bottom panel and the composite slab with sandwich bottom panel have functions of sound insulation and thermal preservation, however they are inadequacy to resist bending moment and have complex construction procedure. The concrete composite slab with precast ribbed panel is provided with good mechanical behavior, economy and practicability, and is worth further researching and promoting.
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Nikam, Y. K., and Dr H. S. Jadhav. "Review on Multistoried Building with Flat and Grid Slab." International Journal for Research in Applied Science and Engineering Technology 10, no. 7 (July 31, 2022): 4337–44. http://dx.doi.org/10.22214/ijraset.2022.45993.
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Abstract: An increase the use of tall structures is caused by a constant rise in population. An earthquake is called on by seismic waves that reach the surface of the earth. Different locations experience different shaking intensity during earthquakes, and these locations also experience various degrees of construction damage. In order to build the structure to withstand an earthquake, these lateral forces on the structure must be estimated and specified. Structures should be stiff and strong enough to control displacement at supports and be designed to resist these rapid forces. Even a building's floor design can vary depending on how the structure responds to load. For long span projects, a conventional slab types are not typically used, but grid slab and flat slab are the most appropriate and cost-effective options. However, these two slabs have recently seen significant growth in India; they are often both flat slabs and grid slabs, which makes them comparable. The usage of flat slab buildings for construction is widespread in the modern day because they have several advantages over conventional RC frame structures in terms of architectural freedom, space use, ease of formwork, and speed of construction. For analysis and design IS 1893:2016, IS 456:2000 are used.
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Choi, Hyun Ki, J. S. Kim, E. S. Jin, and Chang Sik Choi. "An Experimental Study on Shear Reinforcement Methods of Interior Flat Plate-Column Connections." Key Engineering Materials 385-387 (July 2008): 857–60. http://dx.doi.org/10.4028/www.scientific.net/kem.385-387.857.
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This research is an experimental study on full-scale interior slab-column connections of flat-plate. Three types of shear reinforcements were proposed to prevent brittle punching shear failure that could result in collapse of whole flat plate structures. A series of four flat plate specimens including a specimen without shear reinforcement and three specimens with the reinforcements was tested. The dimension of the slabs was 2620*2725*180mm and the specimens had a 600*800mm square column at the center of the slabs. The slabs were tested up to failure using monotonic vertical shear forces. The presences of the shear reinforcements substantially increased punching shear capacity and ductility of the interior slab-column connections.
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Girish, N., and N. Lingeshwaran. "A Comparative Study of Flat Slabs Using Different Shear Reinforcement Parameters." International Journal of Engineering & Technology 7, no. 2.20 (April 18, 2018): 321. http://dx.doi.org/10.14419/ijet.v7i2.20.16725.
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Punching shear failure is a brittle failure and it is one of the most important types of failure to be considered while designing a reinforced concrete flat slab. This paper aims to study the performance of reinforced concrete flat slabs equipped with different punching shear reinforcement parameters. Three flat slab specimens were cast where two specimens contain punching shear reinforcement in the form of shear stirrups and structural shearbands. The test specimens have length and width of 1000mm and thickness of 185mm for the slabs. The slabs are connected to a column at the center with length and breadth of 300mm and a depth of 700mm. The test specimens were supported by steel plates with length and breadth of 150mm and a thickness of 25mm at the four corners of the slab. The test specimens are loaded on the column face at the top. The deflection, strain and crack pattern were observed and recorded.
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Yankelevsky, David Z., Yuri S. Karinski, and Vladimir R. Feldgun. "Damage and Failure of a Column-Supported RC Flat Slab Subjected to Impulsive Loading." Applied Sciences 13, no. 3 (February 2, 2023): 1933. http://dx.doi.org/10.3390/app13031933.
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RC flat slabs supported by an array of columns subjected to the action of impulsive pressure were investigated. The slabs were designed for static loads according to current standards. The dynamic responses of 4 × 4- and 8 × 8-column-supported slabs were similar, as were damage and failure. A simplified model consisting of a tributary area and a central column yielded similar results, demonstrating the accuracy of the simplified model and its reliability. These analyses exhibited modes of damage and failure characterized by large shear distortions in the slab–column connection zone. The rest of the span remained undamaged and in a horizontal position. In all analyses, the slab concrete around the column was fully damaged. The rebars failed within a limited zone at the slab–column connections. The early failure of integrity reinforcement indicated that it could not fulfill its duty; thus, a subsequent progressive collapse scenario was inevitable. All bent-up rebars failed, and their contribution to shear resistance was doubtful. The static analysis was entirely different from the dynamic failure mode. Impulsive loading damage and failure were similar to those in the case of slab-on-slab impact; in both cases, the slab underwent large displacement and severe damage in the narrow slab–column zone, whereas the rest of the slab remained almost completely flat and undamaged.
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Singh, Akshansh, and Vinayak Mishra. "Study of a Flat Slab Building with a Shear Wall at Periphery and X-Bracing." International Journal for Research in Applied Science and Engineering Technology 10, no. 8 (August 31, 2022): 734–39. http://dx.doi.org/10.22214/ijraset.2022.46262.
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Abstract: Flat slab construction practice faces great risk during severe earthquake shaking. In the study two different types of flat slab buildings are taken into account; flat slab with shear wall at X-Bracing and flat slab with at periphery. This lateral force resisting mechanism strengthens structural stiffness of these flat slab structures. It is observed that the lateral force resisting capacity of flat slab structure increases significantly with the use of shear wall.
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Munthe, Agyanata Tua, and Guntur Jatmiko. "Planning Parking Building Using Flat Slab And Drop Panel As A Replacement Conventional Beam With Analyzing Bending Moment Value & Sliding Style Based On SNI 1726-2012." Journal of World Conference (JWC) 2, no. 3 (May 31, 2020): 1–12. http://dx.doi.org/10.29138/prd.v2i3.207.
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The construction of a 5-stored parking building is planned to use a flat slab (with drop panels). Flat slab (with drop panel) is a type of two-way plate without beams that directly rests on the column. the flat slab can reduce the height of the structure and construction time. However, flat slabs require plates that are thicker than usual to overcome deflection and punching shears. In this final project, a 5-story reinforced concrete structure will be reviewed with a span of 8 x 8.3 m. Analysis and design was carried out with the help of the 2016 ETABS program to find the value of intersection between floors, shear moments and forces taking into account the consequences of dead load, super dead load, life, and earthquake (dynamic)
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Elsheshtawy, Sarah S., Ata K. Shoeib, Amal Hassanin, and Dina M. Ors. "Influence of the Distribution and Level of Post-Tensioning Force on the Punching Shear of Flat Slabs." Designs 7, no. 1 (December 21, 2022): 1. http://dx.doi.org/10.3390/designs7010001.
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Punching shear is the most common failure mechanism of slabs that are supported directly on columns. The slab–column connection is always vulnerable to critical punching shear; thus, it is necessary to investigate the effect of various parameters on the punching shear behavior of the flat slabs. This work presents an experimental study to evaluate the effect of the level of prestressing force and layout of the strands on the punching shear behavior of the slab–column connection in terms of the maximum load, deflection, stiffness, ductility, and the absorbed energy. Five square post-tension flat slabs (2000 mm × 2000 mm) with 150 mm thickness were tested. Increasing the prestressing force increased the maximum load and the ductility with a delay in damage in the case of uniformly distributed strands. Additionally, the banded layout of the post-tensioning strands significantly increased the punching shear capacity of the post-tensioned flat slabs at all levels of prestressing. The influence of the layout of the strands on the flat slab ductility is clearly visible in cases of high prestressing force as the ductility decreases in cases with distributed strands when compared to the same flat slabs with banded strands. Finally, the predicted values of the ultimate load of the punching shear using different codes, including the Egyptian Code of Practice (ECP-203), the American Building code (ACI-318), the CEB-FIP Model code and the Euro code, are compared to the experimental values of the ultimate punching shear strength of the post-tensioned and non-post-tensioned flat slabs.
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Abbas, Abdulnasser M. "NON-LINEAR ANALYSIS TO IMPROVE PUNCHING SHEAR STRENGTH IN FLAT SLAB USING Z-SHAPE SHEAR REINFORCEMENT." Muthanna Journal of Engineering and Technology 7, no. 1 (October 6, 2019): 65–70. http://dx.doi.org/10.52113/3/mjet/2019-7-1/65-70.
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Currently, flat slabs become one of the widely used structures due to its architectural benefits such as uncomplicated formwork, flexibility and minimum construction time. However, these structures are relatively weak to resist the punching shear due to a considerable lowering in stiffness induced from the development of cracks that resulting from axial and seismic loads. Moreover, the punching failure is considered a brittle failure caused by the transferring of unbalanced moments and shear forces between the structural members. Unfortunately, this may cause a catastrophic collapse, especially in the region of the slab-column. Therefore, many experimental and theoretical studies were done to improve the punching strength of the flat slab. In the current work; a finite element three-dimensional non-linear analysis has simulated by ABAQUS tool to investigate the structural behaviour of flat slab. Two specimens have considered, the first is a flat slab reinforced by ordinary steel reinforcement. While in the second one, a Z-shape shear rebar improvement has been added to the slab-column connection. The proposed model has reflected a reasonable enhancement to the flat slab. The analysis considers different parameters such as punching shear forces, deformations, and stresses of Von-Mises. The outcomes indicate that punching shear strength is increased by approximately 11.1%, and the deflections are decreased by 77.3% when the Z-shape reinforcement is used. In the meantime, stress concentrations were reduced and move from the slab-column connection.
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Ozden, Sevket, Ugur Ersoy, and Turan Ozturan. "Punching shear tests of normal- and high-strength concrete flat plates." Canadian Journal of Civil Engineering 33, no. 11 (November 1, 2006): 1389–400. http://dx.doi.org/10.1139/l06-089.
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Experimental research was conducted to investigate the punching shear performance of flat plates. A large number of slab specimens of normal- and high-strength concrete were tested under concentric and eccentric loads. The effects of flexural reinforcement and the use of steel fiber reinforcement were investigated. Experimental expressions were developed for the computation of residual slab strength. Experimentally observed punching shear capacities were compared with those from the provisions of Canadian Standards Association (CSA) standard CSA-A23.3-04. The results indicate that concrete strength plays an important role in punching capacity and slab rigidity. Slabs with a higher percentage of flexural reinforcement show an increase in punching capacity. The use of steel fibers results in improved strength and stiffness while also enhancing the postpeak deformability and residual strength. The empirical expressions developed provide reasonably good predictions of residual slab capacities. CSA-A23.3-04 expressions result in conservative punching shear capacity predictions for concentrically loaded slabs and provide good agreement with the experimentally observed punching shear capacities for eccentrically loaded slabs.Key words: reinforced concrete, flat plate, punching shear, strength, high-strength concrete, eccentric loading, slab re inforcement ratio, steel fiber reinforced concrete.
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Kalib, Eden Shukri, and Yohannes Werkina Shewalul. "Response of the Flat Reinforced Concrete Floor Slab with Openings under Cyclic In-Plane Loading." Advances in Civil Engineering 2021 (September 23, 2021): 1–9. http://dx.doi.org/10.1155/2021/2503475.
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The responses of flat reinforced concrete (RC) floor slabs with openings subjected to horizontal in-plane cyclic loads in addition to vertical service loads were investigated using nonlinear finite element analysis (FEA). A finite element model (FEM) was designed to perform a parametric analysis. The effects of opening sizes (7%, 14%, 25%, and 30% of the total area of the slab), opening shapes (elliptical, circular, L-shaped, T-shaped, cross, and rectangular), and location on the hysteretic behavior of the floor slab were considered. The research indicated that openings in RC floor slabs reduce the energy absorption capacity and stiffness of the floor slab. The inclusion of 30% opening on the floor slab causes a 68.5%, 47.3%, and 45.6% drop in lateral load capacity, stiffness, and lateral displacement, respectively, compared to the floor slab with no openings. The flat RC floor slab with a circular opening shape has increased efficiency. The placement of the openings is more desirable by positioning the openings at the intersection of two-column strips.
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Angriawan, Jordi, and Leo Stefanus Tedianto. "ANALISIS PENGARUH DIMENSI KOLOM DAN PENGGUNAAN DROP PANEL TERHADAP KEGAGALAN GESER PONS PADA STRUKTUR FLAT SLAB." JMTS: Jurnal Mitra Teknik Sipil 2, no. 4 (December 10, 2019): 269. http://dx.doi.org/10.24912/jmts.v2i4.6308.
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Teknologi sudah berkembang dengan masif dan mempengaruhi metode pelaksanaan konstruksi pelat lantai. Salah satu inovasinya adalah flat slab. Flat slab adalah konstruksi struktur pelat beton bertulang yang mentransfer beban langsung ke kolom pendukung tanpa bantuan elemen balok. Kegagalan yang biasanya terjadi pada struktur flat slab ini adalah kegagalan geser pons yang diakibatkan karena gaya yang bekerja di sekitar kolom. Kegagalan geser pons dapat direduksi dengan penambahan penebalan di sekitar muka kolom (drop panel) atau dengan penambahan dimensi kolom. Pada pembahasan kali ini, dilakukan analisis untuk mencari besarnya gaya geser pons yang terjadi pada flat slab dengan menggunakan aplikasi berbasis metode elemen hingga. Gaya geser pons pada struktur flat slab akan dibandingkan pada dimensi kolom yang bervariasi, juga akan dibandingkan antara flat slab tanpa drop panel dan flat slab dengan drop panel. Pembahasan ini bertujuan untuk mengetahui pengaruh dimensi kolom dan penggunaan drop panel pada konstruksi flat slab terhadap kegagalan geser pons. Penelitian ini menggunakan metode elemen hingga dan metode analisis teoritis berdasarkan SNI. Kesimpulan yang didapat adalah penambahan dimensi kolom dan penggunaan drop panel pada flat slab dapat mereduksi kegagalan geser pons.
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Subedi, N. K., and P. S. Baglin. "Design of slab–column junctions in flat slabs." Proceedings of the Institution of Civil Engineers - Structures and Buildings 156, no. 3 (August 2003): 319–31. http://dx.doi.org/10.1680/stbu.2003.156.3.319.
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Choi, Hyun Ki. "The Effect of Anchorage Strength with Anchorage Capacity in Flat Plate." Key Engineering Materials 627 (September 2014): 245–48. http://dx.doi.org/10.4028/www.scientific.net/kem.627.245.
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The punching shear on the flat plate slab-column connection can bring about the reason of the brittle punching shear failure which may result of collapsing the whole structure. From the development of residential flat plate system, the shear reinforcement is developed for preventing the punching shear. This study proposed 3 reinforcements that are increased to bond capacity using lateral bar, the structure test is performed. As performed test result, because slabs not keep enough bond length, slab is failed before shear reinforcement's yield strength duo to anchorage of slip. According to result, FEM analyzed an effect of slab thickness and concrete compressive. The study suggests shear strength formula that possible a positive shear reinforcement in slab-column connection.
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Ghoreishi, Mehrafarid, Ashutosh Bagchi, and Mohamed Sultan. "Review of the Punching Shear Behavior of Concrete Flat Slabs in Ambient and Elevated Temperature." Journal of Structural Fire Engineering 4, no. 4 (December 1, 2013): 259–80. http://dx.doi.org/10.1260/2040-2317.4.4.259.
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There are a number of benefits associated with two-way concrete flat slab construction for office buildings, parking garages and apartments - for example, reduced formwork, prompt erection, flexibility of partitions, and minimal increase in story heights. However, concrete flat slabs could be quite vulnerable to punching shear failure in the event of a fire. The objective of the present article is to provide a state of the art review of the existing research and the issues associated with concrete flat slabs in fire and elevated temperature. There are a number of experimental and analytical studies on the punching shear behavior of concrete flat slabs in ambient conditions, available in the literature. Based on these studies, it is found that punching shear capacity in ambient condition is affected by many factors, which may not remain constant during a fire exposure. Only a limited number of studies on concrete flat slabs for punching shear failure in fire are available. This paper reviews the available experimental and analytical studies, standards and codes to address the research gap in estimating of punching shear strength of concrete flat slab-column connections without shear reinforcement.
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Dilger, Walter. "Flat slab-column connections." Progress in Structural Engineering and Materials 2, no. 3 (2000): 386–99. http://dx.doi.org/10.1002/1528-2716(200007/09)2:3<386::aid-pse43>3.0.co;2-m.
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Vidaković, Aleksandar, Lucia Majtánová, and Jaroslav Halvonik. "Effect of Membrane Forces on Punching Shear Capacity of Flat Slabs." Solid State Phenomena 322 (August 9, 2021): 136–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.322.136.
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The paper presents the analysis of the membrane forces and moment redistribution effect on punching shear capacity of flat slabs on the area of the inner column. The previous experimental tests performed on the isolated slab specimens representing the slab-column connections are assessed by the method that uses the levels-of-approximation (LoA) approach, introduced in the fib Model Code 2010. LoA I to III are intended for design and the highest LoA IV, which uses non-linear finite element analysis (NLFEA) combined with the Critical Shear Crack Theory (CSCT) model is used for assessment and a better understanding of the punching shear phenomenon. Both, multi-layered (2D) shell and three-dimensional (3D) continuum elements were used to model the slab-column connection specimen and were found to accurately predict the structural response. The numerical model was then used to conduct a parametric study on the influence of slab continuity on punching shear resistance. The results from a non-linear analysis of continuous slab models are then compared with the punching shear resistance obtained from the code provisions. The paper will present the obtained results by the LoA method and recommendations concerning of NLFEA modelling of RC flat slabs.
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SAĞLIYAN, Sibel. "A NEW DESIGN FOR FLAT SLABS: FLAT SLAB WITH CONTINUOUS DROP PANEL." INTERNATIONAL REFEREED JOURNAL OF ENGINEERING AND SCIENCES, no. 6 (April 30, 2016): 63. http://dx.doi.org/10.17366/uhmfd.2016616662.
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Padhiar, Kamal, Dr C. D. Modhera, Dr A. K. Desai, and Dr S. A. Vasanwala. "Effect of load balancing on punching shear stress and deflection of post tensioning flat slab with different grade of concrete." International Journal of Engineering & Technology 7, no. 3.29 (August 24, 2018): 157. http://dx.doi.org/10.14419/ijet.v7i3.29.18548.
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Flat slabs are a widely adopted solution now a day for buildings, because of their economic and functional advantages. The main objective of this paper is to analysis of post tensioning flat slab by changing the different parameter such as span of slab, grade of concrete and load balancing and comparing the result such as deflection and punching shear. Grade of concrete and load balance directly influence to the deflection and punching shear of flat slab. So in this paper concrete grade varies M-35 to M-50 is considered and load balance varies from minimum 25% to maximum 100% is considered. The use of ADAPT-PT builder 2015 is recommended because of its friendly use and quick calculation capabilities. Use of the ACI Code equivalent frame method of analysis was performed using said software.
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Gardner, N. J. "Punching shear provisions for reinforced and presfressed concrete flat slabs." Canadian Journal of Civil Engineering 23, no. 2 (April 1, 1996): 502–10. http://dx.doi.org/10.1139/l96-054.
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The validity of the CSA A23.3-94 code provisions for punching shear were compared with the punching shear results of 142 reinforced concrete flat slabs, 16 prestressed concrete flat slabs with unbonded tendons, and 17 flat slabs with unbonded prestressed and supplementary bonded reinforcement. The code prediction equations are not capable of direct verification against experimental results without using a correction factor. Using a justifiable correction factor, the CSA A23.3-94 provisions are appropriately conservative for reinforced concrete slabs but the scatter is large. However, it was concluded that the CSA A23.3-94 provisions are not conservative for prestressed concrete flat slabs. An equation is proposed to calculate the punching shear capacity of reinforced concrete and prestressed concrete slabs, which has a smaller coefficient of variation than the punching shear provisions of CSA A23.3-94, for symmetrically loaded interior columns. The critical section of the proposed method is the perimeter of the column, which is easier to justify than an arbitrary critical perimeter half the effective depth of slab from the column. Key words: reinforced concrete, prestressed concrete, flab slabs, punching shear.
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Zardi, Muhammad. "PERILAKU PUNCHING SHEAR PADA HUBUNGAN KOLOM BULAT DENGAN FLAT SLAB AKIBAT BEBAN TEKAN AKSIAL." Jurnal Teknik Sipil Unaya 1, no. 1 (February 27, 2019): 1–14. http://dx.doi.org/10.30601/jtsu.v1i1.1.
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The aim of the tests was to investigate the influence of concrete strength, the eccentricity of the column and the use of shear reinforcement in flat slabs on punching shear. The research specimens are 8 units of flat slabs. Flat slab size 1400 x 1400 mm2 with thickness of 120 mm. Flat slabs were connected with circular column with dimension 225 mm of diameter and 200 mm of height. Flat slabs were made in to 2 variations of concrete strength, e.i. 30 MPa and 60 MPa, 2 variations of shear reinforcement, e.i. without shear reinforcement and with shear reinforcement and 2 variations of eccentricity that, e.i. without eccentricity and with eccentricity. Each treatment has 1 specimen. Each specimen has 6 cylinder specimens. Cylinder specimens used as a concrete strength control for main specimen (flat slab). The tests showed that the concrete strength had a strong influence on punching shear strength. This is shown by capacity increase of 42.78%; 54.00%; 46.59% and 0.02%. The value is ratio between the maximum load of the specimens with 60 MPa and 30 MPa at the same eccentricity and the same shear reinforcement. The eccentricity of column reduce the capacity of punching shear. This is shown by 3 specimens decrease in capacity of 3.70%; 36.75% and 7.30%. Only 1 specimen that increase in capacity of 9.27%. The value is ratio between the maximum load of the specimens with 40 mm eccentricity and 0 mm eccentricity at the same compressive strenght and the same shear reinforcement. The use of shear reinforcement does not always increase the punching shear capacity. There are 2 observations that increased capacity (52.07% and 65.37% at the centric load) and 2 observations decreased capacity (0.12% and 4.92% at the eccentric load). The value is ratio between the maximum load on the specimens using shear reinforcement with the specimens that do not use shear reinforcement at the same compressive strenght and the same eccentricity.The use of shear reinforcement increase punching shear capacity of flat slab at the centric load condition. The use of shear reinforcement decrease punching shear capacity of flat slab at the eccentric load condition.
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V, Indrani, Shubha D. K, and Lavina E. J. "Dynamic Analysis of Multistory RCC Building Frame with Flat Slab and Grid Slab." International Journal of Trend in Scientific Research and Development Volume-2, Issue-4 (June 30, 2018): 1143–48. http://dx.doi.org/10.31142/ijtsrd14269.
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Wijaya, Tohar, and Leo Tedianto. "ANALISIS PENGARUH PENGGUNAAN DROP PANEL TERHADAP NILAI MOMEN LENTUR DAN GESER PONS FLAT SLAB DENGAN METODE ELEMEN HINGGGA." JMTS: Jurnal Mitra Teknik Sipil 2, no. 2 (June 26, 2019): 125. http://dx.doi.org/10.24912/jmts.v2i2.4301.
Full textAbstract:
Beberapa saat kebelakang ini, pertumbuhan pembangunan infrastruktur dan gedung sangatlah tinggi. Berbagai inovasi dan pembaharuan pun muncul dalam bidang konstruksi, salah satunya pelat lantai. Flat slab adalah salah satu contohnya. Flat slab sendiri adalah konstruksi struktur pelat beton bertulang yang tidak menggunakan elemen balok, dimana pelat langsung ditopang oleh kolom dimana dalam beberapa kondisi digunakan drop panel untuk menahan gaya yang timbul pada daerah sekitar kolom. Gaya yang timbul pada daerah kolom itu adalah gaya geser dua arah atau biasa disebut gaya geser pons (punching shear). Pada pembahasan kali ini, dilakukan analisis mencari besarnya nilai momen lentur dan gaya geser pons pada flat slab dengan menggunakan bantuan aplikasi Finite Element Analysis (FEA). Nilai momen lentur dan gaya geser dibandingkan antara flat slab tanpa penggunaan drop panel dan flat slab dengan penggunaan drop panel. Tujuan dari pembahasan kali ini adalah untuk mengetahui pengaruh penggunaan drop panel pada konstruksi flat slab terhadap nilai momen lentur dan geser pons yang terjadi. Metode yang digunakan adalah finite element method serta metode analisis teoritis berdasarkan SNI. Kesimpulan yang didapat, adalah penggunaan drop panel pada flat slab menurunkan gaya geser pons dan momen lentur di daerah lapangan pada struktur flat slab.