有机聚合物剪力键的破坏机理及承载能力研究

Failure Mechanism and Shear Capacity of Organic Polymer Shear Connectors

为了解决金属剪力键存在初始裂缝、焊接残余应力、剪应力传递不均匀等缺陷,进行了有机聚合物非金属剪力键代替传统金属剪力键的研究.采用推出试验方法,设计、制作并测试了8组试件(共24个试件),在考虑有机聚合物剪力键的粘结厚度、弹性模量及界面处理工艺等影响参数的基础上,研究了这类剪力键的破坏机理和极限承载能力,同时,提出了预测界面极限抗剪承载能力的计算公式.研究结果表明:有机聚合物与混凝土共同被剪坏是主要的破坏形式;非金属剪力键界面极限剪应力分布在1.10~2.47 MPa之间,非金属剪力键与金属剪力键具有同等能力的界面抗剪水平.

In order to deal with several weaknesses of metal shear connectors such as original crack, welding residual stress and transfering shear capacity intermittently, the performance of organic polymer shear connectors was introduced to study. Eight sets specimens （total 24 specimens） with different adhesive thickness, Young^ modulus and interface roughness of organic polymer shear connectors were investigated by push-out test, the ultimate shear capacity and the failure modes were also observed. Considering the main influence factors such as the adhesive thickness, Young’s modulus and interface roughness of organic polymer shear connectors, an computational formula on the ultimate shear capacity was proposed. The results show that ： organic polymer and concrete sheared together is the main damage form; ultimate shear capacity of organic polymer shear connectors is between 1. 10 and 2. 47 Mpa,the analysis and test results both show that the shear capacity of metal and organic polymer shear connectors is the same.