T形件螺栓连接卷边PEC柱-钢梁组合框架结构抗震试验研究  

Experimental Research on Seismic Mechanism of Innovative PEC Column-Steel Beam Composite Frame with T-stub Bolted Connection

作　　者：方有珍[1] 徐晓光 孙国华[1] 符兴国 FANG Youzhen;XU Xiaoguang;SUN Guohua;FU Xinguo(Jiangsu Key Laboratory of Structure Engineering,Suzhou University of Science and Technology,Suzhou 215011,China)

机构地区：[1]苏州科技大学江苏省结构重点实验室(土木工程学院)

出　　处：《应用基础与工程科学学报》2019年第5期1077-1090,共14页Journal of Basic Science and Engineering

基　　金：国家自然科学基金项目(51478286,51078247);江苏省“六大人才高峰”高层次人才资助(JZ-033)

摘　　要：为研究T形件螺栓连接卷边钢板组合截面PEC柱-钢梁组合框架结构的抗震机理,设计制作了一榀底部两层单跨组合框架1/2缩尺试件并进行水平低周往复荷载试验.基于试验现象和测试数据,从试件结构的滞回特性、水平抗侧刚度退化、节点性能、耗能能力与抗震延性、塑性机构发展进程与延性破坏模式等性能进行分析.研究结果显示:T形件螺栓连接增大了梁柱节点刚度,改善了结构的整体性,试件的初始抗侧刚度较大、极限承载力较高;T形件螺栓连接使得梁端塑性铰形成位置远离节点区,试件滞回曲线较为饱满,试验结束对应承载力未出现明显降低,且对应整体侧移角、位移延性系数和等效黏滞阻尼系数表明试件具有良好的抗倒塌能力、抗震延性与耗能能力;T形件螺栓连接PEC柱-钢梁组合框架试件塑性破坏机构发展进程为T形件端部梁截面和PEC柱脚相继形成塑性铰,实现了框架结构的理想延性耗能模式.To study the seismic mechanism of PEC column fabricated with crimping steel panel composite section-steel beam composite frame with T-stub bolted connection,a 1/2 scale specimen of two-story and one bay composite frame at bottom was fabricated and tested under low-cycle reversed loading.Based on the experimental observation and measurements,the seismic performance as hysteretic characteristics,lateral stiffness,mechanical behavior of joint,energy-dissipation capacity and ductility,developing process of plastic mechanism and ductile failure mode were evaluated.Test results showed that T-stub bolted connection increased the rotational rigidity of joint and improved the integrity of the specimen,which led to its larger initial lateral stiffness and higher ultimate bearing capacity;plastic hinge forming location away from beam end due to T-stub bolted connection,the specimen has approximately full hysteretic loop and its ultimate bearing capacity was not descended significantly at loading end;the global drift,ductility coefficient and equivalent viscous damping coefficient indicated that the specimen owned sound deformation,ductility and energy-dissipation capacity;the developing process of plastic failure mechanism primarily induced by the plastic hinges were formed in all beam sections near T-stud end and column sections at bottom successively,and the ideal ductile energy-dissipation mode for frame structure was achieved.

关 键 词：T形件螺栓连接 卷边PEC柱 组合框架 抗震机理 水平低周往复荷载试验 

分 类 号：TU398[建筑科学—结构工程]