钢质往复弯曲耗能铰滞回性能试验研究及理论分析  

Experimental and numerical investigation of steel energy-dissipating hinge under cyclic loading

作　　者：郑莲琼 颜桂云[1,2] 魏常贵 马永超[1,2] Zheng Lianqiong;Yan Guiyun;Wei Changgui;Ma Yongchao(School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;Fujian Provincial Key Laboratory of Advanced Technology and Informatization in Civil Engineering,Fujian University of Technology,Fuzhou 350118,China)

机构地区：[1]福建工程学院土木工程学院,福建福州350118 [2]福建工程学院福建省土木工程新技术与信息化重点实验室,福建福州350118

出　　处：《土木工程学报》2020年第12期29-43,共15页China Civil Engineering Journal

基　　金：国家自然科学基金(51578152)。

摘　　要：提出一种销轴连接新型钢质往复弯曲耗能铰,可用于装配式结构预制梁柱连接,并实现梁端耗能和塑性铰外移。对两个该新型耗能铰进行滞回试验,试验结果表明:新型耗能铰整体绕销轴转动,试件的破坏形式为耗能元件受压翼缘屈曲或受拉翼缘断裂;其滞回曲线饱满,能量耗散系数达3.0以上,具有良好的耗能能力,无明显的刚度退化和强度退化;量测完整的耗能铰塑性转角达0.055rad,两个试件的延性系数均大于4.0,均满足规范要求。建立该类耗能铰的有限元模型,对比可得有限元模拟结果与试验结果吻合较好。基于有限元模型对钢质往复弯曲耗能铰开展机理分析和参数分析。结果表明:耗能铰达峰值荷载时,耗能元件中心可达全截面塑性,具有塑性设计要求的转动能力,且在转动过程中承载力不降低;耗能铰削弱程度、耗能铰长度对该类耗能铰的初始刚度、承载力和转动能力有较大的影响,耗能铰削弱范围对滞回曲线影响较小。基于参数分析,给出耗能铰主要构造参数的取值范围,并建议了该类耗能铰的简化滞回模型,简化计算结果和试验结果、有限元计算结果吻合较好。A new type of steel energy-dissipating hinge,which can be used to connect a prefabricated reinforced concrete beam and column in a frame structure in high seismic regions,is proposed in this study.Based on the seismic design concept commonly referred to as"strong connection",this steel hinge works by forcing the plastic hinge outward from the column face.The hysteretic tests for two steel energy-dissipating hinges were conducted.The experimental results demonstrate that the specimens have good bearing performance and can rotate around the pin axis.The failures of the specimens were concentrated on the flange,primarily due to the buckling of the compressed flange,or due to fractures forming on the tensioned flange.The hysteretic curves of the energy-dissipating hinge appeared to be plump,and the energy dissipation coefficient could be above 3.0,exhibiting good energy absorption capacity and ductility of the steel hinges without significant strength or stiffness degradation observed.The plastic rotation of the energy-dissipating hinge was 0.055 rad,and the ductility factors of the two specimens were greater than 4.0,conforming to the code requirements.Furthermore,a finite element(FE)model was established for the energy-dissipating hinge specimen,and the FE results agreed well with the test results.By using the FE model,the mechanism was studied and parametric analysis was conducted for the steel energy-dissipating hinge.It was found that when the energy dissipation reaches the peak load,the center of the energy dissipation element can reach the full-section plasticity,meeting the rotation capability required by the plastic design.It was also found that the bearing capacity did not decrease during the rotation process.The initial stiffness,bearing capacity,and rotation capacity of the energy-dissipating hinge were significantly affected by the weakening degree and length of the energy-dissipating hinge.The weakening range of energy-dissipatinghinge,however,had slight effect on the hysteretic curve.Based on the param

关 键 词：钢质耗能铰 销轴连接 滞回试验 机理分析 简化滞回模型 

分 类 号：TU375.4[建筑科学—结构工程]