PEC柱-钢梁摩擦耗能部分自复位组合框架抗震试验研究  

Experiment on Seismic Performance of PEC Column-Steel Beam Composite Frame with Partial Self-centering Friction Damped Connection

作　　者：方有珍 高怡 杨勇[2] 孙敏 孙国华 FANG Youzhen;GAO Yi;YANG Yong;SUN Min;SUN Guohua(School of Civil Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;College of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]苏州科技学大学土木工程学院,江苏苏州215011 [2]西安建筑科技大学土木工程学院,西安710055

出　　处：《建筑钢结构进展》2024年第4期20-28,共9页Progress in Steel Building Structures

基　　金：国家自然科学基金(52178149、51478286);江苏省教育厅重大科研项目(18KJA560003)。

摘　　要：为系统研究梁柱采用自复位连接组合框架的抗震机理,选取预拉杆长度设置、PEC柱截面强弱轴布置和柱脚连接方式3个设计参数,设计制作了4榀PEC柱-钢梁梁柱摩擦耗能部分自复位连接组合框架1∶2缩尺试件并进行拟静力抗震试验。通过试验现象观察和数据分析,对试件的滞回特性、抗侧刚度退化、复位能力、滞回耗能等抗震性能进行研究。结果表明:摩擦耗能部分自复位连接通过T形件长圆孔合理设置实现了“设计地震水平阶段实现复位,大震设计水平阶段自复位连接连接转化为伴随出现螺栓承压型受力实现部分自复位”的性能化设计目标;设计地震阶段,试件主要通过辅助摩擦耗能件耗能,且卸载残余侧移小于自复位结构侧移限值(0.3%),在大震作用阶段,试件通过辅助摩擦耗能件与结构构件损伤联合耗能,承载能力仍继续增大,且仍具有部分自复位能力;预拉杆设置有限长度可显著增强结构整体性,PEC柱弱轴布置一定程度上降低了结构整体性,而PEC柱脚采用铰接可显著削弱结构整体性。To further study the seismic behavior of PEC column-steel beam composite frame with partial self-centering friction damped connection,the design parameters such as pre-stressed bar length,PEC column section layout and connection type of column base were considered.Four specimens with 1:2 scale were designed for conducting quasistatic tests.Based on the observations and measured data in the test,the seismic performance of specimens such as hysteretic behavior,lateral-resistant stiffness,self-centering capacity and hysteretic energy-dissipation were studied.The results indicate that performance-based design target of“self-centering at design-earthquake stage,partial selfcentering resulted from self-centering connection turn to accompanied by bearing-type connection at maximum considered earthquake stage”was achieved with rational dimension of slotted hole.All specimens have superior self-centering function for the residual drift less than self-centering limit(0.3%),and the energy-dissipation capacity is resulted from additional friction device at design-based earthquake stage.Even at maximum considered earthquake stage, the specimen still has partial self-centering function with load-bearing capacity enhancement, and the energydissipation capacity is provided by additional friction device with damage of structural element. Limited length of prestressed bar can improve the structural integrity. PEC column weak-axis layout reduce the integrity, while hinged connection at base of column weakens the integrity significantly.

关 键 词：摩擦耗能部分自复位连接 PEC柱-钢梁组合框架 复位能力 滞回耗能 拟静力试验 

分 类 号：TU352.11[建筑科学—结构工程]