不同轴压比装配式RCS梁柱组合件抗震性能  

Seismic performance of precast RCS beamcolumn subassemblies with different axial compression ratios

作　　者：李升才 朱旦 周玲玲 LI Shengcai;ZHU Dan;ZHOU Lingling(College of Civil Engineering,Putian University,Putian 351100,China;College of Civil Engineering,Huaqiao University,Xiamen 361021,China;College of Civil Engineering,Minnan University of Science and Technology,Quanzhou 362700,China)

机构地区：[1]莆田学院土木工程学院,福建莆田351100 [2]华侨大学土木工程学院,福建厦门361021 [3]闽南理工学院土木工程学院,福建泉州362700

出　　处：《地震工程与工程振动》2022年第4期92-104,共13页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51578253);福建省科技计划引导性项目(2020Y0087)。

摘　　要：为了研究装配式RCS梁柱组合件的破坏形态及滞回性能、刚度退化、延性和耗能能力等抗震性能,以轴压比为变化参数,设计制作了6个缩尺比例为1/2的梁柱组合件试件,进行了低周往复加载试验。并利用有限元软件ABAQUS对其进行数值模拟和扩大参数分析。首先,通过对比、总结的方法,得出了试件的破坏形态并分析了其滞回性能;其次,采用切线刚度计算方法,对比分析了各试件刚度退化规律;然后,通过图解法确定屈服位移,并利用公式计算位移延性系数,从而分析判断各试件的延性性能;最后,采用等效粘滞阻尼系数的计算方法研究试件的耗能能力。研究结果表明:在低周往复加载下,能够保证柱混凝土浇筑质量的装配式RCS梁柱组合件往往会发生梁铰破坏,其破坏过程以钢梁首先屈服为标志;组合件试件的滞回曲线形状较为饱满,能表现出按照“强柱弱梁,节点更强”原则设计的组合件会有良好抗震性能;轴压比对组合件的抗震性能有一定影响,但影响不大。当轴压比由0.135增大到0.203时,峰值荷载提升了6%,由此可见承载能力随着轴压比的增大而略有提高。并且随着轴压比的增大,组合件的初始刚度略有提高,刚度退化速率略有加大,但随轴压比增大,延性和耗能能力均略有减弱;发生梁铰破坏的组合件的延性系数均大于3,满足抗震规范要求。In order to study the failure modes and seismic performance of the Beam-column Sub-assemblies of Precast RCS Composite Structure(BSPRCS)in terms of hysteretic behavior,stiffness degradation,ductility,energy dissipation capacity,etc.,low cyclic reversed loading tests were conducted on six test specimens of BSPRCS designed in a scale of 1/2 with varied axial compression ratio.The finite element software ABAQUS was used for numerical simulation and extended parameter analysis.First,the test results of the specimens were compared and analyzed to determine their failure modes and hysteretic behaviors.Then,the stiffness degradation of each specimen was analyzed using the tangent stiffness calculation method and compared with others,the yield displacement was determined by the graphic method,and the displacement ductility coefficient was calculated using a formula to judge the ductility of each specimen.Finally,the energy dissipation capacity of the specimens was studied using the equivalent viscous damping coefficient.Results show that under the horizontal low cyclic reversed loading,a beam-hinged failure often occurs to the BSPRCS with good quality of column concrete pouring and the failure process is marked by the steel beam yielding first.The shape of hysteretic loop curve of the specimens is relatively full,suggesting that the BSPRCS designed according to the principle of“strong column weak beam and stronger joint”has good seismic performance.The axial compression ratio has a certain influence on the seismic performance of the BSPRCS,but the influence was in significancy.When the axial compression ratio increases from 0.135 to 0.203,the maximum load increases by 6%,which shows that the bearing capacity increases slightly as the axial compression ratio increases,and also as the axial compression ratio increases,the initial stiffness and the rate of stiffness degradation increases slightly.But as the axial compression ratio increases,the ductility and energy dissipation capacity decrease slightly.In addition,the

关 键 词：钢板箍 梁柱组合件 拟静力试验 抗震性能 有限元分析 

分 类 号：TU398[建筑科学—结构工程]