侧向压力作用下PBL剪力键的抗剪性能  

Shear Performance of PBL Shear Connector Under Lateral Pressure

作　　者：宋瑞年 王潇碧 占玉林[1] 赵人达[1] SONG Ruinian;WANG Xiaobi;ZHAN Yulin;ZHAO Renda(School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu Sichuan 610031,China;Jincheng College of Sichuan University,Chengdu Sichuan 611731,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]四川省公路规划勘察设计研究院有限公司,四川成都610031 [3]四川大学锦城学院,四川成都611731

出　　处：《铁道建筑》2019年第12期34-37,共4页Railway Engineering

基　　金：国家自然科学基金(51878564);四川省交通运输科技项目(2016B2-1-2)

摘　　要：为研究侧向压力对PBL(Perfobond Rib)剪力键受力全过程的影响机理,设计了4组PBL剪力键推出试验,采用螺杆施加侧向压力,进行全过程破坏加载试验,对试件的荷载-滑移曲线和破坏模式进行了分析。研究结果表明:PBL剪力键的抗剪刚度大,承载力高,剪力键延性好,达到极限承载力后剪力键承载能力降低,但不发生脆性破坏;侧向压力增强了混凝土板的整体性,试件破坏模式均为贯通钢筋剪断和底部混凝土压碎;侧向压力增强了PBL剪力键的抗剪承载力,增加幅度与侧向压力成正比;侧向压力以界面摩擦力的方式参与抗剪作用,钢混结合面的摩擦因数在试验全过程中保持稳定,测试值为0.78。In order to study the influence mechanism of lateral pressure on the whole process of PBL(Perfobond Rib)shear connectors,four sets of push out tests were designed.The load-slip curve and failure mode of the specimens were analyzed by the failure loading test of the whole process with the screw rod applied lateral pressure.The results show that PBL shear connector has large shear rigidity,high bearing capacity and good ductility.After it reaches the ultimate bearing capacity,the bearing capacity decreases,but no brittle failure occurs.The lateral pressure enhances the integrity of the concrete slab,and the failure modes of specimens are through shear of steel bars and bottom concrete crushing.The lateral pressure enhances the shear bearing capacity of PBL shear connector,the increase amplitude is proportional to lateral pressure.The lateral pressure participates in the shear resistance in the way of interface friction,and the friction coefficient of the steel-concrete interface remains stable during the whole test process,and the test value is 0.78.

关 键 词：桥梁工程 PBL剪力键 试验研究 抗剪承载力 破坏模式 侧向压力 

分 类 号：TU398.9[建筑科学—结构工程] U448.38[建筑科学—桥梁与隧道工程]