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Journal articles on the topic 'Precast concrete frames'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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1

Park, Seon-Chee, Won-Kee Hong, Sunkuk Kim, and Xiangyu Wang. "Mathematical Model of Hybrid Precast Gravity Frames for Smart Construction and Engineering." Mathematical Problems in Engineering 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/916951.

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The structural stability, constructability, economic feasibility, environmental-friendliness, and energy efficiency of hybrid composite frame systems have been demonstrated by practical application and research. A hybrid composite frame system combines the economy of precast concrete structures with the constructability of steel frame structures, including erection speed. Novel composite frames will ultimately maximize the efficiency of structural design and facilitate construction. This paper presents hybrid precast frames, which are precast composite frames based on a simple connection between precast concrete columns and beams. The hybrid precast frames designed to resist gravity loading consist of PC columns, PC beams, and steel inserted in the precast members. Steel sections located between the precast columns were simply connected to steel inserted at each end of the precast beams. Dynamic analysis of a 15-story building designed with the proposed composite frame was performed to determine the dynamic characteristics of a building constructed of hybrid frames, including frequencies and mode shapes.

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2

Priestley, Nigel. "Seismic Design Philosophy for Precast Concrete Frames." Structural Engineering International 6, no. 1 (1996): 25–31. http://dx.doi.org/10.2749/101686696780496003.

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3

Hassanli, Reza, Tom Vincent, Allan Manalo, et al. "Connections in GFRP reinforced precast concrete frames." Composite Structures 276 (November 2021): 114540. http://dx.doi.org/10.1016/j.compstruct.2021.114540.

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4

Kurosawa, Ryotaro, Hiroyasu Sakata, Zhe Qu, and Takashi Suyama. "Precast prestressed concrete frames for seismically retrofitting existing RC frames." Engineering Structures 184 (April 2019): 345–54. http://dx.doi.org/10.1016/j.engstruct.2019.01.110.

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5

Baran, M., D. Okuyucu, M. Susoy, and T. Tankut. "Seismic strengthening of reinforced concrete frames by precast concrete panels." Magazine of Concrete Research 63, no. 5 (2011): 321–32. http://dx.doi.org/10.1680/macr.10.00030.

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6

Behnamfar, Farhad, Hadi Rafizadeh, and Mortza Omidi. "Innovative connections for precast concrete moment resisting frames." Bulletin of the New Zealand Society for Earthquake Engineering 48, no. 3 (2015): 204–21. http://dx.doi.org/10.5459/bnzsee.48.3.204-221.

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This research work presents new details for moment connections in precast concrete structures satisfying both design and practice criteria. In this paper the results of the numerical study on the connections are presented. For the analysis, the ANSYS software is selected because of its diversity in nonlinear analysis. By calculating the monotonic load-displacement curve of each connection, the connections are evaluated for their stiffness, strength, and ductility. The compressive strength of the connection concrete is taken to be 30, 35 and 40 MPa, for each round of analysis. The results of the analysis show that the proposed connections are stiff enough to be moment resisting and to be emulating an equivalent monolithic, or basic connection. It is illustrated that the connections are stronger but somewhat less ductile than the basic connection regardless of the concrete strengths examined. Moreover, it is shown that in each precast connection while increasing the compressive strength of concrete does not affect the connection stiffness considerably, it increases the ultimate load and ductility of the connection. As a main result of this study, the suggested connection details are categorized based on their stiffness, strength, and ductility. The suggested connections can be used in moment resisting precast concrete buildings based on the desired strength and ductility.

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7

Ertas, Onur, Sevket Ozden, and Turan Ozturan. "Ductile Connections in Precast Concrete Moment Resisting Frames." PCI Journal 51, no. 3 (2006): 66–76. http://dx.doi.org/10.15554/pcij.05012006.66.76.

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8

Hu, Ju-Yun, Won-Kee Hong, and Seon-Chee Park. "Experimental investigation of precast concrete based dry mechanical column-column joints for precast concrete frames." Structural Design of Tall and Special Buildings 26, no. 5 (2016): e1337. http://dx.doi.org/10.1002/tal.1337.

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9

Nateghi Alahi, Fariborz, and Mohsen Vatandoost. "Single diagonal precast prestressed concrete bracing for strengthening existing concrete frames." International Journal of Advanced Structural Engineering 10, no. 4 (2018): 339–47. http://dx.doi.org/10.1007/s40091-018-0201-5.

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10

TEEUWEN, P. A. (Paul), C. S. (Cees) KLEINMAN, H. H. (Bert) SNIJDER, and H. (Herm) HOFMEYER. "Analysis of steel frames with precast concrete infill panels." IABSE Congress Report 17, no. 18 (2008): 216–17. http://dx.doi.org/10.2749/222137908796292362.

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11

Frosch, Robert J., Wanzhi Li, James O. Jirsa, and Michael E. Kreger. "Retrofit of Non-Ductile Moment-Resisting Frames Using Precast Infill Wall Panels." Earthquake Spectra 12, no. 4 (1996): 741–60. http://dx.doi.org/10.1193/1.1585908.

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Many existing reinforced concrete moment-resisting frames located in seismic zones lack strength and ductility. One approach for correcting these deficiencies is the construction of infill walls to strengthen and stiffen the structure. Cast-in-place construction is often used; however, there are conditions where cost, time constraints, or limiting disruptions to building operations may dictate other solutions. One possible modification is the use of infill walls constructed of precast concrete panels. A precast infill wall system eliminates the need for large formwork during construction. Elimination or reduction of connection hardware between precast panels or between panels and the existing frame element can provide additional efficiency. Problems associated with casting large quantities of concrete in an existing building are eliminated. Construction time and inconvenience to occupants may be reduced along with the costs. The precast system has the potential of reducing the overall costs of rehabilitating existing structures.

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12

Lee, Ho-Haeng, Ki-Ho Kim, Seunghyun Son, Kwangheon Park, and Sunkuk Kim. "TIME REDUCTION EFFECTS OF STEEL CONNECTED PRECAST CONCRETE COMPONENTS FOR HEAVILY LOADED LONG-SPAN BUILDINGS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 26, no. 2 (2020): 160–74. http://dx.doi.org/10.3846/jcem.2020.11673.

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The characteristics of large logistics buildings are their long spans and the ability to take heavy loads. Usually, PC components are used for their frames to ensure quick construction. However, the erection of most pin jointed PC structures increases the time and the cost incurred for ensuring structural stability and construction safety. To solve this problem, “smart” frames have been developed, which have tapered steel joints at both ends of the PC components. A smart frame with the moment frame concept not only assures structural stability and construction safety, but it also simplifies and quickens the erection because of its tapered joint detail. The purpose of this study is to compare the erection time and cost effects of the steel connected PC components for heavily loaded long-span logistics buildings with the existing PC frames. For this study, we selected a logistics building constructed with PC components and redesigned it as the smart frame, and the erection simulations were performed. We analyzed the time reduction effects of the smart frame. Our results confirmed that the use of the smart frame reduced the erection time and cost practically. Our investigations will help develop the erection simulation algorithms for smart frames.

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13

Akin, Arife, and Rifat Sezer. "A study on strengthening of reinforced concrete frames using precast concrete panels." KSCE Journal of Civil Engineering 20, no. 6 (2016): 2439–46. http://dx.doi.org/10.1007/s12205-016-0188-z.

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14

Pan, Jianwu, Xian Wang, and Hao Dong. "Strengthening of Precast RC Frame to Mitigate Progressive Collapse by Externally Anchored Carbon Fiber Ropes." Polymers 13, no. 8 (2021): 1306. http://dx.doi.org/10.3390/polym13081306.

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The robustness of precast reinforced concrete (RC) frames is relatively poor, while the precast RC frames are strengthened to mitigate progressive collapse, avoiding “strong beams and weak columns” and the anchorage failure of strengthening materials under large deformation condition are the key problems. Aiming to discuss these problems, this paper carried out an experimental research of strengthening on three half-scale assembled monolithic frame subassemblages to mitigate progressive collapse. One specimen was strengthened by implanting carbon fiber rope (CFR) with polymer into concrete, one specimen was strengthened by binding CFR with special knot, and the last one was not strengthened. The failure mode, collapse failure mechanism and strengthening effect of subassemblages were discussed. Analytical models of load capacity increment contributed by CFR and construction suggestions of precast RC frame to mitigate progressive collapse were proposed. The results indicated that none of the strengthened specimens had anchorage failure. The two strengthening methods significantly increased the load capacity of the subassemblages in the catenary action (CA) stage with little effect on the flexural action (FA) stage and compressive arch action (CAA) stage.

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15

Xue, Weichen, and Xinlei Yang. "Seismic tests of precast concrete, moment-resisting frames and connections." PCI Journal 55, no. 3 (2010): 102–21. http://dx.doi.org/10.15554/pcij.06012010.102.121.

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16

Bull, D. K., and Robert Park. "Seismic Resistance of Frames Incorporating Precast Prestressed Concrete Beam Shells." PCI Journal 31, no. 4 (1986): 54–93. http://dx.doi.org/10.15554/pcij.07011986.54.93.

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17

Morgen, Brian G., and Yahya C. Kurama. "A Friction Damper for Post-Tensioned Precast Concrete Moment Frames." PCI Journal 49, no. 4 (2004): 112–33. http://dx.doi.org/10.15554/pcij.07012004.112.133.

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18

Ochs, Jay E., and Mohammad R. Ehsani. "Moment Resistant Connections in Precast Concrete Frames for Seismic Regions." PCI Journal 38, no. 5 (1993): 64–75. http://dx.doi.org/10.15554/pcij.09011993.64.75.

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19

Hawlleh, Rami, Habib Tabatabai, Adeeb Rahman, and Akef Amro. "Non-Dimensional Design Procedures for Precast, Prestressed Concrete Hybrid Frames." PCI Journal 51, no. 5 (2006): 110–30. http://dx.doi.org/10.15554/pcij.09012006.110.130.

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20

HONG, Won-Kee, Gyeongju KIM, Chaeyeon LIM, and Sunkuk KIM. "DEVELOPMENT OF A STEEL-GUIDE CONNECTION METHOD FOR COMPOSITE PRECAST CONCRETE COMPONENTS." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 23, no. 1 (2016): 59–66. http://dx.doi.org/10.3846/13923730.2014.975740.

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Green Frame is a column-beam structure formed by connecting a composite precast concrete beam with a steel connection on the column side. Similar to steel frame construction, the green columns cover 3 stories per unit, and generate vertical and horizontal eccentricities due to construction errors and the gravitational loads of beams. Such eccentricities make it difficult to install the upper floor beams and adjacent frames. This problem not only results in decreased productivity, but also in time delays and cost overrun. The objective of this study is to develop a new steel-guide connection method for composite precast concrete (CPC) components after analysing the erection process and structural mechanism to resolve eccentricity issues. The connection mechanism developed in this study resolves these eccentricities and promotes efficient, accurate, and safe construction.

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21

Takeda, Kiyoji, Kyoya Tanaka, Toshiaki Someya, Asao Sakuda, and Yoshiteru Ohno. "Seismic retrofit of reinforced concrete buildings in Japan using external precast, prestressed concrete frames." PCI Journal 58, no. 3 (2013): 41–61. http://dx.doi.org/10.15554/pcij.06012013.41.61.

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22

Aksoylu, Ceyhun, and Rifat Sezer. "Investigation of precast new diagonal concrete panels in strengthened the infilled reinforced concrete frames." KSCE Journal of Civil Engineering 22, no. 1 (2017): 236–46. http://dx.doi.org/10.1007/s12205-017-1290-6.

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23

Fedorova, Natalia, Sergey Savin, and Vladislav Kovalev. "Buckling of Compressed-Bent RC Elements of Frame-Bracing Structural System at “Unknown” Accidental Impacts." E3S Web of Conferences 97 (2019): 04035. http://dx.doi.org/10.1051/e3sconf/20199704035.

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The paper presents the results of studies of the buckling of the bearing elements of the new structural system, which consists of reinforced concrete precast-monolithic panels-frames produced industrially under a special accidental impact caused by a sudden column removal from the building frame. It is established that under special accidental impact caused by a sudden column removal from RC precast-monolithic structural system consists of industrial panel-frame elements, the reason of the fracture spreading within and outside local damage (fracture) zone may be the buckling of compressed-bent elements.

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24

Lee, Jung-Yoon, and Dong-Ik Shin. "Evaluation of Effects of Earthquake Load for Precast Concrete Moment Frames." Journal of the Korea Concrete Institute 31, no. 6 (2019): 567–75. http://dx.doi.org/10.4334/jkci.2019.31.6.567.

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25

Sucuoglu, Haluk. "Effect of Connection Rigidity on Seismic Response of Precast Concrete Frames." PCI Journal 40, no. 1 (1995): 94–103. http://dx.doi.org/10.15554/pcij.01011995.94.103.

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26

EI-Sheikh, Magdy T., Richard Sause, Stephen Pessiki, and Le-Wu Lu. "Seismic Behavior and Design of Unbonded Post-Tensioned Precast Concrete Frames." PCI Journal 44, no. 3 (1999): 54–71. http://dx.doi.org/10.15554/pcij.05011999.54.71.

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27

Restrepo, Jose I., Robert Park, and Andrew H. Buchanan. "Design of Connections of Earthquake Resisting Precast Reinforced Concrete Perimeter Frames." PCI Journal 40, no. 5 (1995): 68–80. http://dx.doi.org/10.15554/pcij.09011995.68.80.

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28

Priestley, M. J. Nigel, and Jian Ren Tao. "Seismic Response of Precast Prestressed Concrete Frames With Partially Debonded Tendons." PCI Journal 38, no. 1 (1993): 58–69. http://dx.doi.org/10.15554/pcij.01011993.58.69.

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29

Li, Yadong, Youliang Ding, Fangfang Geng, and Libin Wang. "Seismic response of self‐centering precast concrete frames with hysteretic dampers." Structural Design of Tall and Special Buildings 28, no. 8 (2019): e1604. http://dx.doi.org/10.1002/tal.1604.

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30

Morgen, Brian G., and Yahya C. Kurama. "Seismic Response Evaluation of Posttensioned Precast Concrete Frames with Friction Dampers." Journal of Structural Engineering 134, no. 1 (2008): 132–45. http://dx.doi.org/10.1061/(asce)0733-9445(2008)134:1(132).

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31

Kang, Shao-Bo, and Kang Hai Tan. "Robustness Assessment of Exterior Precast Concrete Frames under Column Removal Scenarios." Journal of Structural Engineering 142, no. 12 (2016): 04016131. http://dx.doi.org/10.1061/(asce)st.1943-541x.0001616.

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32

Titi, Andrea, and Fabio Biondini. "Probabilistic seismic assessment of multistory precast concrete frames exposed to corrosion." Bulletin of Earthquake Engineering 12, no. 6 (2014): 2665–81. http://dx.doi.org/10.1007/s10518-014-9620-2.

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33

Sucuoǧlu, H. "Inelastic seismic response of precast concrete frames with constructed plastic hinges." Computers & Structures 56, no. 1 (1995): 121–31. http://dx.doi.org/10.1016/0045-7949(94)00536-c.

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34

Belleri, Andrea. "Displacement based design for precast concrete frames with not-emulative connections." Engineering Structures 141 (June 2017): 228–40. http://dx.doi.org/10.1016/j.engstruct.2017.03.020.

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35

Rocha, Arthur L., Marcelo de A. Ferreira, Wilian dos S. Morais, and Bruna Catoia. "The Use of Moment-Resisting Frames and Braced Frames for Lateral Stability of Multy-Storey Precast Concrete Structures." Solid State Phenomena 259 (May 2017): 173–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.259.173.

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Precast structures for multi-storey buildings can be designed with economy, safety and high performance. However, depending on the height of the building and the intensity of the lateral loads, the lateral stability system must be carefully chosen in order to maximize the global structural performance. In Brazil, the most common method for lateral stability is achieved by moment resisting precast-frames, wherein the moment-rotation response of the beam-column connections are responsible to provide the frame action, which will govern the distribution of internal forces and the sway distribution along the building height. On the other hand, in Europe, bracing systems comprised by shear walls or infill walls are mostly used, wherein beam-column connections are designed as hinged. The aim of this paper is to present a comparison between these methods for lateral stability, applying nine structural simulations with moment resisting precast-frames, shear walls and infill walls solutions, divided in three groups - 3 building with 5 storeys (21 meters high), 3 buildings with 10 storeys (41 meters high) and 3 building with 20 storeys (81 meters high). All first storeys are 5 meters high, while all the others are 4 meters high. The results from all structural analyses are compared. As conclusion, while moment-resisting beam-column connections are more feasible for applying in low-rise precast buildings, the use of shear walls and infill walls are more efficient for tall buildings due to decrease of lateral displacements, having a reduction of second order effects but also increasing the reactions at the foundations of bracing elements.

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36

Muhtar. "Precast Bridges of Bamboo Reinforced Concrete in Disadvantaged Village Areas in Indonesia." Applied Sciences 10, no. 20 (2020): 7158. http://dx.doi.org/10.3390/app10207158.

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Bamboo is an inexpensive, environmentally friendly, and renewable building material that thrives in Indonesia. Bamboo has a high tensile strength but also has weaknesses, namely, it is easily attacked by insects and has high water absorption. Utilization of bamboo as a precast concrete bridge reinforcement must be treated first through soaking, drying, and giving a waterproof coating and sand. This research aimed to obtain a precast bamboo reinforced concrete bridge technology with good integrity, with measuring parameters of deformation and deflection according to AASHTO standards. The dimensions of the bridge were a span of 320 cm, a width of 224 cm, and a height of 115 cm. Two bridge frames were connected by four bridge beams. The bridge plate was made of a 10-cm-thick concrete plate. The bridge support of the reinforced concrete is assumed to be the hinge support and the rubber bearing is assumed to be the roller support. The bamboo reinforced concrete frame bridge test was carried out directly with a load of a minibus-type vehicle. The test results show that the precast bamboo reinforced concrete frame bridges have sufficiently good integrity; that is, they can distribute loads with deflection and deformation that do not exceed their permits. The maximum displacement occurs in the bridge frame of 0.25 mm, meeting the requirements based on the AASTHO and RSNI T-12-2004 standards, which is not more than Δmax = L/800 = 3.75 mm. The maximum deformation occurs in the bridge beam of 0.20 mm, and the bridge frame of 0.13 mm meets the requirements based on the AASTHO and RSNI T-12-2004 standards, which is not more than δmax = L/800 = 3.75 mm.

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37

Geng, Fangfang, Youliang Ding, Honglei Wu, and Kang Yang. "Seismic Risk Assessment of a Novel Self-Centering Precast Concrete Frame under Near-Fault Ground Motions." Applied Sciences 10, no. 18 (2020): 6510. http://dx.doi.org/10.3390/app10186510.

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The damage to structures caused by the velocity pulse effect of near-fault earthquake waves cannot be ignored, yet there are few studies on the risk assessment of seismic performance for precast concrete frame under near-fault earthquake waves. A novel self-centering precast concrete (SCPC) frame with hysteretic dampers is proposed to obtain great self-recovering and energy consumption characteristics. To accurately assess the seismic behaviors of the novel SCPC frame under the near-fault earthquake waves, a prototype structure is modelled and elastoplastic dynamic analysis is conducted at the design basis earthquake (DBE) and the maximum considered earthquake (MCE) seismic levels. Incremental dynamic analysis and the vulnerability analysis are performed. Annual and 50-year exceeding probabilities of the novel SCPC frame are calculated afterwards. In addition, the reinforced concrete (RC)frame and the traditional SCPC frame are also modelled, whose section sizes, reinforcements arrangement and seismic intensity are consistent with the novel SCPC frame. The dynamic time-history analysis at the two seismic levels are also carried out for two types of frames. The analysis results demonstrate that the novel SCPC frame has great seismic performance and low seismic risk possibility under the near-fault earthquakes loading.

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38

Mohammed, Khaleel, M. Jameel, Zainah Ibrahim, and Chee Tan. "Performance of a Ductile Hybrid Post-Tensioned Beam-to-Column Connection for Precast Concrete Frames under Seismic Loads: A Review." Applied Sciences 11, no. 16 (2021): 7497. http://dx.doi.org/10.3390/app11167497.

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The performance of precast concrete frame structures against seismic loads mainly depends on the beam-to-column connection. A ductile hybrid connection consists of unbonded post-tensioning steel and bonded reinforcement bars, both of which provide overall moment resistance to the frame. Post-tensioning steel acts as a restoring force which brings the structure back to its initial position upon unloading. Mild steel acts as an energy dissipator which yields in tension and compression. To evaluate the performance of precast frame structures, the structural engineer requires extensive knowledge of the complex nonlinear behavior of the connection. Standardization to mass produce is one of the benefits of precast construction, but with standardization in design there is severe risk. All previous earthquakes have clearly shown that continuous repetition of accepted practice without proper engineering review can lead to disaster. It is important to understand how different parameters of the connection influence the behavior and performance of the frame against seismic loads. The present study helps structural engineers and researchers with a detailed review of hybrid post-tensioned connections. This review is focused mainly on precast beam-to-column connections, studies on the development of hybrid connections, performance evaluations of hybrid connections, and the performance evaluation of precast frames with hybrid connections.

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39

Xu, Li, Jinlong Pan, CKY Leung, and Wanyun Yin. "Shaking table tests on precast reinforced concrete and engineered cementitious composite/reinforced concrete composite frames." Advances in Structural Engineering 21, no. 6 (2017): 824–37. http://dx.doi.org/10.1177/1369433217733759.

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40

Maya, L. F., C. Zanuy, L. Albajar, C. Lopez, and J. Portabella. "Experimental assessment of connections for precast concrete frames using ultra high performance fibre reinforced concrete." Construction and Building Materials 48 (November 2013): 173–86. http://dx.doi.org/10.1016/j.conbuildmat.2013.07.002.

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41

Vasconez, Rosa M., Antoine E. Naaman, and James K. Wight. "Behavior of HPFRC Connections for Precast Concrete Frames Under Reversed Cyclic Loading." PCI Journal 43, no. 6 (1998): 58–71. http://dx.doi.org/10.15554/pcij.11011998.58.71.

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42

Englekirk, Robert E. "Concepts for the Development of Earthquake Resistant Ductile Frames of Precast Concrete." PCI Journal 32, no. 1 (1987): 30–48. http://dx.doi.org/10.15554/pcij.01011987.30.48.

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43

C.D. Hoenderkamp, Johan. "Push-Pull Interface Connections in Steel Frames with Precast Concrete Infill Panels." Open Construction and Building Technology Journal 6, no. 1 (2012): 63–73. http://dx.doi.org/10.2174/1874836801206010063.

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44

Torquati, Mauro, Andrea Belleri, and Paolo Riva. "Displacement-Based Seismic Assessment for Precast Concrete Frames with Non-Emulative Connections." Journal of Earthquake Engineering 24, no. 10 (2018): 1624–51. http://dx.doi.org/10.1080/13632469.2018.1475311.

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45

Baran, Mehmet, and Tugrul Tankut. "Retrofit of Non-Ductile RC Frames with Precast Concrete (PC) Wall Panels." Advances in Structural Engineering 14, no. 6 (2011): 1149–66. http://dx.doi.org/10.1260/1369-4332.14.6.1149.

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46

Wang, Lei, Zhen-Yun Tang, Yue Li, and Kai Qian. "Seismic behavior of masonry-infilled precast concrete frames considering effects of opening." Construction and Building Materials 211 (June 2019): 756–70. http://dx.doi.org/10.1016/j.conbuildmat.2019.03.287.

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47

Kim, Ji-Hun, Won-Kee Hong, Hee-Cheul Kim, and Seong-Kyum Kim. "Analytical Investigation of the Flexural Capacity of Precast Concrete Frames with Hybrid Joints." Advances in Civil Engineering 2019 (February 27, 2019): 1–12. http://dx.doi.org/10.1155/2019/7470128.

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This study aims to evaluate flexural strength based on the inelastic neutral axis calculated from all stress states of the proposed precast composite columns with hybrid beam-column joints, which facilitate the erection of concrete precast frames in a similar manner to that used for steel frames. It was also shown analytically that hybrid joints with headed studs contribute significantly to the flexural moment capacity and effectively increase the flexural structural performance of precast composite columns. The strain compatibility-based analytical results were compared with test data, showing results with an error of less than 8% at the critical section for the maximum load limit state of specimens. It is observed that the strength contributed by steel sections and headed studs increased by 30% and 35% at the yield limit state and maximum load limit, respectively, reducing the dependence on rebars. The total contribution of the headed studs was as large as 12.2% (average of the two layers of headed studs) at the maximum load limit state, whereas the strength provided by the tensile rebars decreased from 90.5% to 63.9% for the specimen with headed studs at the maximum load limit state.

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48

Trekin, Nikolay, Emil Kodysh, Alexander Bybka, Alexander Yamalov, and Nikita Konkov. "Evaluation of the impact of compliance of precast discs of overlapping on the work of the frame of a multi-storey building." E3S Web of Conferences 97 (2019): 04022. http://dx.doi.org/10.1051/e3sconf/20199704022.

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The article provides an analysis and justification of the need to take into account the compliance of discs of overlapping and coatings when calculating frames from precast concrete structures. Previously conducted full-scale experiments showed that the rigidity of the precast overlapping with full filling of the seams, in comparison with the monolithic overlapping, decreases by 3-15 times due to the ductility of the joints. The use of refined computational models of structural solutions for frames, which take into account the compliance of the conjugations of elements, makes it possible to trace possible redistribution of efforts. Such an approach when reconstructing, it is possible to optimally select and calculate the enforcement of structure, and on new designing, to increase reliability and / or improve the economic performance of frame buildings. According to the results of analytical studies, formulas were adopted for the parameters that allow one to take into account the overall compliance of overlapping disks and coatings in computational models of building frames. Numerical studies on the computational model of a frame building made it possible to evaluate the effect of accounting for compliance on the stress-strain state of a multi-storey frame.

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49

Zlatkov, Dragan, Slavko Zdravkovic, Biljana Mladenovic, and Marina Mijalkovic. "Seismic analysis of frames with semi-rigid connections in accordance with EC8." Facta universitatis - series: Architecture and Civil Engineering 18, no. 2 (2020): 203–17. http://dx.doi.org/10.2298/fuace201208015z.

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Abstract:

Up to date research has pointed out that most of the structural connections of reinforced concrete (RC) frames, particularly precast ones, behave as semi-rigid. Therefore, it is of great importance to develop an analysis method which takes into account the connection rigidity. For that purpose matrix formulation of the deformation method is used in this paper, and the effect of rigidity of connections on the structure response is included by stiffness matrix for semi-rigidly connected member. The elements of this matrix are functions of the fixity factors at the ends of members. The proposed method is applied in seismic analysis of the precast RC frame structure of the existing industrial hall according to Eurocode 8 (EC8).

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50

Mironova, Juliya. "Structural solution of the horizontal joint of floor slabs in girderless frame." E3S Web of Conferences 274 (2021): 03017. http://dx.doi.org/10.1051/e3sconf/202127403017.

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Abstract:

Despite the widespread use of monolithic construction, precast concrete remains in demand in the construction of residential and administrative buildings. Regardless of the advantages in technology and the quality of work, it is necessary and appropriate to modernize the existing design solutions, which allows you to simplify and speed up the technological operations during construction. Moreover, in the construction of complex nodes and joints, the qualification of workers is important, so simplifying the work without losing the quality of construction and ensuring strength, stability and durability is an important task. This problem can be solved by using modern embedded parts in the joints that do not require welding and other complex technological operations. In this paper, a constructive solution of the horizontal joint of the floor slabs located in the zone of action of minimal forces is proposed on the example of a girderless frame. The purpose of the study is to determine the stress-strain state of the proposed structural solution of the horizontal joint of floor slabs using loopshaped embedded parts «PFEIFER» and to develop recommendations for determining the shear compliance. Based on the analysis of the results of numerical modeling, the features of the stress-strain state of the joint during shear operation are revealed. The results obtained can be used in the design of buildings with precast-monolithic ringless frames, in the modernization of existing standard solutions of precast-monolithic frames, as well as other load-bearing systems made of precast concrete.

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