桁架钢筋混凝土叠合板-钢梁节点抗震性能研究

摘要

混凝土叠合板与钢梁组成的楼盖体系,在地震作用时是否会发生楼板掉落是工程师关心的问题.为此进行了桁架钢筋混凝土叠合板和整浇板与钢梁栓钉连接节点试验.通过施加板面内横向低周反复荷载,获得了两种形式节点的横向抗剪承载力、破坏形态、滞回曲线、位移延性、耗能能力.试验表明两种不同板型节点的横向抗剪承载力、位移延性及耗能能力基本相同,延性系数均小于2.破坏形式为板与栓钉连接处混凝土压碎,同时栓钉发生很大的剪切变形.横向抗剪承载力小于《钢结构设计规范》(GB 50017-2003)的理论计算值,但远大于楼面重力荷载代表值所产生的横向地震作用,故地震时桁架叠合板不会掉落.节点区预制板与后浇混凝土交界侧面应采取构造措施加强连接.%As for the system of the assembled monolithic slab connected by a steel beam,whether the slab falls down during the earthquake is the most important problem to the engineer.A Steel bar truss and concrete superposed slab joint and a cast-in-situ slab joint,which are connected by the steel beam with studs,were tested.A cyclic lateral force was applied in the plan-in direction.The results of shear bearing capacity,failure mode,hysteretic curve,energy dissipation capacity and displacement ductility were obtained.Test showed that shear bearing capacity,energy dissipation capacity and ductility were almost identical for two kinds of joints.The factor of ductility was less than 2.The concrete was seriously damaged on the connecting region between the slab and stud.Meanwhile the studs occurred the serious shear deformation.The experimental shear bearing capacity of a stud is less than the theoretical result from formula of our code for design of steel structures,but significantly larger than the action caused by the lateral earthquake.Therefore the superposed slab wouldn't fall down during the earthquake,and some measures should be taken to strengthen the interface between precast slab and cast-in-situ concrete around joint.