文章编号：1004－5422(2021)03－0328－07 DOI:10.3969/j.issn.1004-5422.2021.03.018

剪力钉极限承载能力研究进展及分析

摘 要：剪力连接件是保证钢—混组合结构和混合结构协同工作的关键构件，目前结构中采用较多的剪力连接件为剪力钉.由于现有的规范对剪力钉极限承载力计算各不相同，有必要对剪力钉极限承载力计算方法进行总结和分析，具体将不同规格剪力钉进行推出试验研究，与不同规范计算值进行比较分析.同时，通过非线性有限元对剪力钉受力情况进行数值分析.研究结果表明：1）对于常用规格剪力钉，目前各国规范中剪力钉极限抗剪承载力均低于推出模型试验实测值，对于大尺寸剪力钉和剪力钉成群布置的情况应保守取值，中国《钢结构设计标准》提出剪力钉极限承载力计算公式较为合理；2）通过合理假定，剪力钉非线性有限元模型可以较好地模拟剪力钉推出试件的受力状态，通过有限元计算分析表明，在距剪力钉根部较近部位其承受了较大的剪应力和轴向应力.
关键词：剪力钉；抗剪承载力；推出试验；有限元分析
中图分类号：U448.38 文献标识码：A

Abstract：The shear connectors are the key components to ensure the cooperative work of steel-concrete composite structure and hybrid structure. At present, shear studs are often used. It is necessary to summarize and analyze the calculation methods of ultimate bearing capacity of shear studs because of the different calculation methods of ultimate bearing capacity of shear studs in the existing codes. The test results of shear studs of different specifications are statistically analyzed and compared with the calculated values of different specifications. At the same time, the nonlinear finite element numerical analysis is used to study the stress state of shear studs. The research results show that: 1) for common specifications of shear studs, the ultimate shear capacity calculated from the codes is lower than the model test value. But for large dimension shear studs and shear studs group, conservative values should be taken, and the computational formula of the ultimate bearing capacity of shear studs is in a reasonable value, which is proposed by “Standard for Design of Steel Structure” in China; 2) based on reasonable assumptions, the nonlinear finite element method of the shear stud can better simulate the stress state of the specimen pushed out by the shear stud. The finite element analysis shows that the shear stud bears large shear stress and axial stress near the root of the shear stud.
Key words：shear stud; shear bearing capacity；push-out test；finite element method