咬合式高强螺栓连接抗剪承载力试验和数值模拟

Experimental Research and Numerical Simulation of Bearing Capacity of a New Type of Occlusive High Strength Bolt Shear Connection

摘要:

在传统高强螺栓连接的基础上，研发了新型咬合式高强螺栓连接.进行了4个传统高强螺栓连接和14个咬合式高强螺栓连接的抗剪承载力试验，详细介绍了试验过程，描述了试验现象.试验结果表明，咬合式高强螺栓连接的破坏模式主要为板件错动破坏；连接板表面刨槽处理可大幅提高连接承载力；螺栓预紧力越大，连接承载力越高；连接板的刨槽深度越大，连接承载力越高.建立了有限元模型，将数值分析获得的破坏模式、荷载位移曲线与试验结果进行比较，验证了二者的一致性，表明数值模型可用于后续大规模数值分析.

Abstract:

Based on the conventional high strength bolt connection, a new occlusive high strength bolt shear connection was developed. Shear bearing capacity experiment of 4 conventional high strength bolt connections and 14 occlusive high strength bolt connections was conducted. The experimental process and the collapse phenomena were introduced and described in detail. It is found that the failure mode of occlusive high strength bolt connection is mainly the dislocation of plates. Grooving on plates could effectively increase the loadbearing capacity of the connection. Moreover, the capacity of the connection increases as the bolt pretension and the depth of grooves increase. A finite element model (FEM) was established, and the failure mode and the loaddeformation curves of the connection was simulated. It is indicated that the FEM is effective because of good agreements between the results of the experiment and that of numerical model. Thus, it is believed that the established FEM could be used to execute the subsequent numerical analyses.