Seismic performance of precast posttensioned concrete frame under low reversed cyclic loading

2021 ◽  
Author(s):  
Xiang Hu ◽  
Weichen Xue ◽  
Xiandong Liao
Keyword(s):  
Cyclic Loading ◽  
Seismic Performance ◽  
Reversed Cyclic Loading ◽  
Concrete Frame ◽  
Posttensioned Concrete ◽  
Reversed Cyclic

Study on Seismic Performance of a Two-Bay Two-Story RCF with Construction Joint under Low-Reversed Cyclic Loading

2013 ◽  
Vol 753-755 ◽  
pp. 719-723
Author(s):  
Xi Kang Yan ◽  
Kang Ma ◽  
Cheng Dong ◽  
Lei Wang ◽  
Pei Chen
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Reinforced Concrete Frame ◽  
Displacement Ductility ◽  
Reversed Cyclic Loading ◽  
Concrete Frame ◽  
Construction Joint ◽  
Hysteretic Performance ◽  
Reversed Cyclic

Based on experiment of a two-bay two-story reinforced concrete frame with construction joint under low-reversed cyclic loading, hysteretic performance, displacement ductility, bearing capacity degeneration, rigidity degeneration, energy dissipation and displacement restoring capacity are studied systematically. The studies show that the frame with construction joint has not better seismic performance than the monolithic cast frame.

Seismic performance of a controlled rocking reinforced concrete frame

2016 ◽  
Vol 20 (1) ◽  
pp. 4-17 ◽  
Author(s):  
Liang Lu ◽  
Xia Liu ◽  
Junjie Chen ◽  
Xilin Lu
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Shaking Table Test ◽  
Joint Stiffness ◽  
Shaking Table ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Metallic Dampers ◽  
Reversed Cyclic

A controlled rocking reinforced concrete frame is a new type of vibration control structure system that uses resilient rocking columns and joints. The effects of earthquakes on this type of structure are reduced by weakening the overall stiffness, whereas the lateral displacement is controlled by the energy-dissipation dampers introduced into the structure. Two tests were performed for research: the reversed cyclic loading test and shaking table test. Two single-span single-story controlled rocking reinforced concrete frames were designed for reversed cyclic loading tests. These tests (i.e. a column-base joint stiffness test, beam-column joint stiffness test, and frame stiffness test) were performed under different conditions. The mechanical analysis model of the rocking joints was derived from the test results. With the parameters obtained from the cyclic tests, a numerical simulation method that established the analytical model of the controlled rocking reinforced concrete frame using the program ABAQUS is proposed, and the dynamic time-history analysis results of the controlled rocking reinforced concrete frame and of the conventional approach are compared to investigate the vibration control effect and seismic performance of the controlled rocking reinforced concrete frame. In addition, the inter-story drift could be effectively controlled by adding metallic dampers, and the shaking table test models of the controlled rocking reinforced concrete frame with metallic dampers were designed and constructed. The comparison of the results of the numerical analysis and the shaking table test demonstrates that the model building of the controlled rocking reinforced concrete frame structure is efficient and that the controlled rocking reinforced concrete frame exhibits an excellent seismic performance.

scholarly journals Experimental Studies on Seismic Performance of Precast Steel Reinforced Concrete Frame and Connections

2015 ◽  
pp. 349-357
Author(s):  
Xiang Hu ◽  
Weichen Xue ◽  
Yanbo Sun ◽  
Chenguang Li
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Experimental Studies ◽  
Frame Structures ◽  
Seismic Zone ◽  
Reversed Cyclic Loading ◽  
Steel Reinforced Concrete ◽  
Reversed Cyclic

A new type of precast steel reinforced concrete (PSRC) frame, which were composed of composite steel reinforced concrete (CSRC) beam, PSRC column and cast-in-situ (CIS) joint, were proposed in this paper. The assemble technique used in the ordinary steel structures were adopted in PSRC frames to improve the construction efficiency. The seismic performance of PSRC frame structures was investigated based on the test results of connections and frame. Firstly, full-scale internal connection specimens, including a CIS connection specimen RCJ-1 and a PSRC connection specimen PCJ-1, were tested under low reversed cyclic loading. Results revealed that both the specimens RCJ-1 and PCJ-1 exhibited similar performance in terms of loading capacity, stiffness degradation and energy dissipation. The ductility of specimen PCJ-1 was about 3.81, which was a little lower than the specimen RCJ-1. Then, a 1/3-scale PSRC frame structure specimen, namely PCF-1, was tested under low reversed cyclic loading. Results showed that the PSRC frame specimen PCF-1 was failed in mixed failure mechanism, which provide good energy dissipation capacity. The ductility coefficient of PCF-1 was about 3.45 indicating that the PCF-1 behaved in ductility manner. The results of this investigation could enrich the data available documenting the behavior of PSRC frame, and contribute to enlarge the application of PSRC frame structures in seismic zone.

Performance of a transfer beam with hybrid reinforcement of CFRP bars and steel bars under reversed cyclic loading

2017 ◽  
Vol 24 (4) ◽  
pp. 621-630
Author(s):  
Jin Chen ◽  
Shiyong Jiang ◽  
Xiangrong Zeng ◽  
Ling Zhou ◽  
Tao Sun ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Seismic Performance ◽  
Flexural Property ◽  
Static Test ◽  
Reversed Cyclic Loading ◽  
Vertical Loading ◽  
Steel Bars ◽  
Hysteretic Characteristics ◽  
Hybrid Reinforcement ◽  
Reversed Cyclic

AbstractHybrid carbon fiber reinforced plastic (CFRP) and steel bar reinforcement concrete were applied in a transfer beam. Three specimens (ZHL-2, ZHL-3, and ZHL-4) corresponded to different forms of reinforcement, reinforcement ratio, and reinforced root number, respectively. The pseudo static test of the three specimens was carried out under the condition of vertical loading and horizontal reversed cyclic loading. The flexural property and failure mode of the transfer beams were demonstrated. Further, the ductility, energy dissipation capability, hysteretic characteristics, structural yield mechanism, and failure mechanism were also studied. The exploration of these factors was aimed to study the bearing capacity and seismic performance of the transfer beam with hybrid CFRP and steel bars. The test results show that if both the upper and lower longitudinal reinforcements were replaced by CFRP bars with a symmetrical reinforcement, the mechanical property and deformation performance would be superior. The performance would be better than the reinforcements with single upper and lower replacement by CFRP bars. Both the upper and lower longitudinal bars of the transfer beam should be replaced by CFRP bars with a symmetrical form of reinforcement. The ductility performance would be better for the transfer beam with the hybrid reinforcement of CFRP bars and steel bars. It showed a seismic performance. The transfer beam with the hybrid reinforcement of CFRP bars and steel bars could meet the design requirements for the ductile frame “strong column, weak beam and strong node.”

scholarly journals Seismic Behavior of Three-Story Prestressed Fabricated Concrete Frame under Dynamic and Low Reversed Cyclic Loading

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Manrong Song ◽  
Jiaxuan He ◽  
Yuan Liu ◽  
Hang Zhang ◽  
Chenjun Ge ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Concrete Structure ◽  
Peak Ground Acceleration ◽  
Seismic Behavior ◽  
Precast Concrete ◽  
Ground Acceleration ◽  
Reversed Cyclic Loading ◽  
Concrete Frame ◽  
Drift Ratio ◽  
Reversed Cyclic

Precast concrete structure is the building industrialization of the sure route. It can realize the construction process of low energy consumption and low emission and effectively meet the green development requirements of the construction industry. Based on prestressing technique, the connections of the precast concrete structure obtain prestress producing integrate joints and continuous frames, which improve the seismic safety and are applied widely in the earthquake area. To study seismic behavior of prestressed fabricated concrete frame structure, the experiments on the concrete frame under dynamic loading and low reversed cyclic loading were carried out. The single-span three-story prestressed fabricated concrete frame can accurately represent the load-carrying capability and the failure mechanism of multistory frame. Results of the study show that experimental specimens have good behaviors such as full hysteresis curves, proper displacement restoring capacity, and energy dissipation; the maximum interlayer drift ratio arrives 0.27% which has no damage to the frame in small earthquakes subjected to the 102 gal peak ground acceleration; the frame is repairable in moderate earthquakes when the maximal interlayer drift ratio arrives 0.73% subjected to the 204 gal peak ground acceleration; plastic hinges appeared at the ends of beam under low reversed cyclic loading firstly where the section curvature ductility factor ranges from 3.64 to 5.62; biaxial compression is acquired at beam-column joints with the help of column axial force and horizontal prestressing force; the beam fails before the column in the prestressed fabricated concrete frame at interlayer drift ratio between 1.56% and 2.56%.

Seismic Performance of Nonprestressed and Prestressed HPC Frames under Low Reversed Cyclic Loading

2011 ◽  
Vol 137 (11) ◽  
pp. 1254-1262 ◽  
Author(s):  
Weichen Xue ◽  
Bin Cheng ◽  
Renguang Zheng ◽  
Liang Li ◽  
Jie Li
Keyword(s):  
Cyclic Loading ◽  
Seismic Performance ◽  
Reversed Cyclic Loading ◽  
Reversed Cyclic

Behavior of HPFRC Connections for Precast Concrete Frames Under Reversed Cyclic Loading

PCI Journal ◽  
1998 ◽  
Vol 43 (6) ◽  
pp. 58-71 ◽  
Author(s):  
Rosa M. Vasconez ◽  
Antoine E. Naaman ◽  
James K. Wight
Keyword(s):  
Cyclic Loading ◽  
Precast Concrete ◽  
Concrete Frames ◽  
Reversed Cyclic Loading ◽  
Reversed Cyclic
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