高强螺栓拼接接头传力特性的有限元模拟与试验研究

Experimental Study and Finite Element Analysis on Friction High-strength Bolt Connections

为研究摩擦型高强螺栓连接接头力学性能与受力状态,对2组试件进行有限元数值模拟分析与试验研究。分析各排螺栓传力比、芯板及拼接板截面应力状态、接触面摩擦应力分布规律。数值模拟结果和试验结果表明:各排螺栓传力比呈马鞍型分布,两端大,中间小;芯板和拼接板应力沿板横向和纵向均呈波浪形分布;不同螺栓压力影响区直径均为2.85倍栓孔直径左右。试验结果与有限元数值模拟结果吻合良好,验证了有限元分析的正确性。本文得到的部分经验参数可为该类节点设计验算提供参考。

In order to study the mechanical behaviors including the load transfer factors of various rows of bolts,stressing state of the sections of core and butt-cover plates and distribution of friction stresses over the contact surface,both finite element analysis（FEA） and experimental study are made with two groups of specimens.FEA and experimental results show as follows： The loads transfer factors of rows of bolts are distributed in the saddle shape,i.e.,a falling-off between the two end edge rows;the stresses of core plates and butt-cover plates are distributed laterally and longitudinally in the form of waves;each of the diameters of the pressure effect regions of varied bolts is about 2.85 times of the diameter of the bolt hole.Good agreement between the experimental and FEA results verifies the accuracy of the finite element analysis.Some parameters from experience will be of significant reference for future research and design of such bolt connections.