界面效应对PCSS剪力键滑移性能的影响实验研究  

Experimental study on the influence of interface effect on the slip performance of PCSS shear connectors

作　　者：高燕梅[1,2] 马飞 叶孝平 刘伟[1] 王国峰[3] 李成君 GAO Yanmei;MA Fei;YE Xiaoping;LIU Wei;WANG Guofeng;LI Chengjun(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Bridge and Tunnel Engineering in Mountainous Area,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil and Architectural Engineering,Heilongjiang Institute of Technology,Haerbin 150050,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]重庆交通大学山区桥梁及隧道工程国家重点实验室,重庆400074 [3]黑龙江工程学院土木与建筑工程学院,黑龙江哈尔滨150050 [4]西南交通大学土木工程学院,四川成都610031

出　　处：《实验技术与管理》2023年第5期42-49,共8页Experimental Technology and Management

基　　金：重庆市自然科学基金项目(cstc2020jcyj-msxmX0062)。

摘　　要：为考察栓钉界面、竖钢板界面对于预制装配抗剪栓钉(PCSS)剪力键抗剪性能的影响,进行了栓钉、竖钢板与混凝土全粘结(F),只有栓钉与混凝土粘结(H),栓钉、竖钢板与混凝土均无粘结(N)的剪力键推出实验研究,并建立了有限元模型,揭示了界面工作机理。实验结果表明:N、H、F型试件承载力和抗剪刚度依次增大,其中栓钉与混凝土间的粘结效应对剪力键抗剪承载力贡献了7.9%,对抗剪刚度贡献了10%;竖钢板与混凝土间的粘结效应对剪力键的抗剪承载力贡献了5.6%,对抗剪刚度贡献约50%。其中,竖钢板与混凝土间的粘结作用对剪力键的抗剪刚度和延性均影响较大。通过有限元Abaqus软件进行模拟分析,考虑零厚度内聚力单元模拟竖钢板与混凝土之间的界面接触,对比弹塑性阶段无粘结效应的界面横向应变,得出PCSS剪力键竖钢板与混凝土间存在约束效应,并且竖钢板与混凝土间的粘结作用能够强化这种约束效应。在计算其抗剪刚度和承载力时,需考虑这种约束效应。In order to investigate the influence of stud interface and vertical steel plate interface on the shear performance of prefabricated composite shear studs(PCSS),the push-out experiment of stud,vertical steel plate and concrete fully bonded(F),only stud and concrete bonded(H),and stud,vertical steel plate and concrete unbonded(N)were carried out,and the finite element model was established,revealing the working mechanism of the interface.The experimental results show that:the bearing capacity and shear stiffness of N,H and F specimens increase in order,where the bond effect between the studs and concrete contributes 7.9%to the shear bearing capacity and 10%to the shear stiffness of the shear connectors,and the bond effect between the vertical steel plate and concrete contributes 5.6%to the shear bearing capacity and about 50%to the shear stiffness of the shear connectors.Among them,the bond effect between the vertical steel plate and the concrete has a greater influence on both the shear stiffness and ductility of the shear connectors.The finite element Abaqus software is used to simulate and analyze the interface contact between the vertical steel plate and concrete by considering the zero-thickness cohesion element.Compared with the interface transverse strain of unbonded effect in the elastic-plastic stage,it is concluded that there is a constraint effect between the PCSS shear connectors vertical steel plate and concrete,and the bonding effect between the vertical steel plate and concrete can strengthen this constraint effect.This constraint effect should be considered when calculating its shear stiffness and bearing capacity.

关 键 词：PCSS剪力键 粘结滑移 抗剪刚度 内聚力接触 

分 类 号：TU[建筑科学]