钢-混组合桥梁多螺栓抗剪连接件的静力特性

为研究单螺栓和多螺栓连接件的不同特性进行了推出试验。结果显示:单螺栓与多螺栓连接件刚度相近,多螺栓连接件中螺栓间距对刚度影响不大。单螺栓连接件的极限强度比多螺栓连接件的高出10%。当荷载达到最大时,单螺栓连接件的相对滑移较多螺栓连接件大19%。多螺栓对抗剪连接件的静力特性几乎没有影响。基于推出试验,给出螺栓的荷载-滑移关系式。与已有关系式相比,新的表达式与试验结果更为接近。研究了连接件的静力特性,并与设计方程进行了对比。结果显示:EC4的计算结果与多螺栓的试验结果一致,美国桥梁设计规范和中国规范的计算结果与单螺栓的试验结果一致。

Static Behavior of Multi-Stud Shear Connectors for Steel-Concrete Composite Bridge

Push-out tests were conducted to investigate the different behavior between single-stud and multi-stud con- nectors. The results show that the single-stud and multi- stud connectors have the similar stiffness, and the spacing of studs has little influence in the stiffness of multi-stud connectors. The ultimate strength of single-stud connector is about 10% larger than multi-stud connectors. When the load reaches its peak, the relative slip of single-stud con- nector is about 19% larger than that of multi-stud connec- tors. The multi-stud effect on static behavior of shear con- nector is negligible. Based on the push-out test results, a new expression of stud load-slip relationship was proposed. Compared to existing relationships, the new expression has a better match with the experimental values. The static be- havior was studied and compared to design equations. The results show that the estimation based on Eurocode-4 a- grees well with the multi-stud test results and the estima- tions based on AASHTO LRFD and Chinese code agree well with the single-stud test results.