中文摘要：

在探讨剪力键抗剪性能时，对H型钢施加推力是推出试验的主要加载方式，但实际操作时组合结构桥梁中钢梁与混凝土梁通过连接件及横向预应力筋接合，此时传统加载方式已不能模拟现实中结构的真实受力状态。本文通过对试件侧面施加正压力的方式来模拟预加力，并用有限元软件建立实体模型分析结构受力情况。结果表明：正压力的存在有效地提高了栓钉剪力连接件和开孔钢板剪力连接件的极限抗剪承载力和构件延性；栓钉断裂后，钢-混结合面的摩擦系数有所增加；有限元仿真分析能很好地模拟推出试验中考虑摩擦力时试件的真实受力情况。

英文摘要：

In the study of push-out test of shear connector performance, thrust is the main loading method tor H-shaped steel. In practice,the steel girder and the concrete girder were connected by the connector and transverse prestressing force in the composite bridge. The traditional loading method had not been able to simulate the structural stress in reality. A method of applying positive pressure to the side of specimen in the push-out test was used to simulated the addition force in this paper. The finite element solid model was established to analyze the actual force of specimen. The results show that the presence of positive pressure effectively increases the ultimate shear capacity and component ductility of stud shear connector and perfobond leiste connectors. The friction coefficient of the steel- concrete interface increased after the stud broke. Finite element simulation analysis could simulate the actual force of specimen effectively when considering positive pressure