开孔钢板铰缝连接构造推出试验与数值模拟

The Push-out Experiment and Numerical Simulation Study on Perforated Steel Plate Connection Construction of Hinge Joint

目的针对公路空心板混凝土铰缝易损坏现象,提出了开孔钢板连接构造,从而解决混凝土铰缝破坏后单板受力的安全问题.方法通过铰缝结构的推出试验,并观察试件的破坏过程和破坏形态,分析开孔板铰缝连接构造的破坏机理;针对铰缝结构的抗剪性能,采用有限元与推出试验相结合的方法,对开孔板铰缝连接构造进行数值模拟.结果在试验荷载刚开始作用于试件时,由于本身静摩擦力存在,结合面未发生滑移;随着荷载增加,结合面内部开始产生微裂纹,并逐步形成较大裂缝,开孔板、贯穿钢筋、混凝土榫及铰缝结合面共同承受外荷载;铰缝结合面产生贯穿裂缝,界面剪力完全由开孔板、钢筋混凝土榫承担,直至完全破坏.结论推出试验荷载-滑移曲线及试件的破坏形态验证了数值模拟方法的正确性,可为进一步对该新型结构抗剪性能及计算方法研究提供依据.

Set perforated steel plate in the original concrete hinge joints,rebar penetrate the hole similar to the method of mechanical hinge,so as to solve the safety problem of concrete hinge joints after single plate loading,and the push-out test and numerical simulation are carried out for the shear performance of the hinge joint structure. In viewof the phenomenon of the damage of the concrete hollowslab concrete hinge joints,the test is carried out aiming at the hinge joint structure.The failure mechanism of the joint is analyzed by observing the failure process and failure mode.Finite element method is used for the numerical simulation of the joint test of the perforated plate joints. First stage,when the experimental load started acting on the specimen,there was no slip oninterface because of static friction; second stage,with the increasing of load,the crack began to develop in the interior of the interface and gradually form a larger cracks,perforated steel plate、rebar、concrete mortise and joint surface bear external load together; three stage,crack penetrate the hinge joint interface,the interface shear was entirely bored by perforated steel plate、reinforced concrete mortise,until completely destroyed. The validity of the numerical simulation method is verified by the load-slip curve and the failure mode of the specimen,which can provide a basis for further study on the shear performance and calculation method of the newstructure.