新型全装配钢-混凝土组合梁连接件推出试验研究

PUSH-OUT TESTS OF SHEAR CONNECTORS FOR NEW FULLY ASSEMBLED STEEL-CONCRETE COMPOSITE BEAMS

该文主要研究一种新型全装配钢-混凝土组合梁,由预制楼板和钢梁通过新型抗剪连接件(以下简称“紧固件”)组合为一体,紧固件固定于预制楼板的钢导槽上,预制混凝土楼板和钢梁界面的荷载传递主要通过紧固件和钢导槽之间的摩擦来实现。为了更好地研究紧固件和钢导槽的性能,对3组试件进行推出试验,研究了不同钢导槽形式、循环加载及紧固件数量对抗剪性能的影响。试验结果表明:紧固件和钢导槽都表现出较好的性能,试件的荷载-滑移曲线可分为3段;钢导槽截面高度较小时约束作用明显;循环加载可提升紧固件的抗剪承载力和刚度;该文推导的抗剪承载力计算公式与试验结果吻合较好。

This paper proposes a new type of connector in fully assembled steel-concrete composite beams,through which the precast floor slab and steel beam are integrated.The load transfer along the interface of the precast concrete slab and the steel beam is primarily achieved through the friction between the connectors and the channels.To achieve a better understanding of the behavior of the connectors and the channels,push-out tests were conducted on 3 specimens.The effects of different channel types,repeated loading,and number of connectors were investigated.The test results show that all the connectors exhibited satisfactory performance,and the load slip curve can be divided into three segments.When the section height of channel is small,the restraining effect is more remarkable.The shear strength and shear stiffness of the connectors can be improved by reloading.The formulas to calculate the shear strength proposed in this paper agree well with the experimental results.