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采用迭代平衡的方法对高强螺栓施加标准预紧力,并考虑高强螺栓预紧力的影响、螺栓帽与盖板之间摩擦的影响、盖板与翼缘或者腹板之间摩擦的影响、螺栓杆与板件孔壁之间非线性接触承压的影响,以非线性通用有限元软件MSC Marc为平台建立了考虑接触摩擦、摩擦滑移和接触承压的高强螺栓拼接三维非线性有限元分析模型。首先模拟了高强螺栓连接的单块板件,并与试验对比验证了模型的可靠性,证实有限元模型可以较好地模拟螺栓的滑移荷载和拼接的极限荷载;然后模拟了高强螺栓梁段拼接节点,并与试验对比证实模拟结果与试验骨架线吻合良好。所提出方法可以较好地模拟拼接节点中高强螺栓的全过程受力性能,可以用于高强螺栓拼接节点的分析和计算。
The method of iterative balance is adopted to apply the standard pretightening force to the high-strength bolt, and the influence of the pretightening force of the high-strength bolt, the influence of the friction between the bolt cap and the cover plate, the friction between the cover plate and the flange or the web, The influence of non-linear contact pressure between the rod and the hole wall of the plate is established by using the nonlinear common finite element software MSC Marc as the platform. The three-dimensional nonlinear finite element analysis of the high-strength bolt splicing considering the contact friction, the frictional sliding and the contact pressure is established model. First of all, a single plate with high strength bolts was simulated and compared with the test to verify the reliability of the model. It was confirmed that the finite element model can simulate the ultimate load of the bolts and the splicing load. Then, Stitching nodes, and compared with the test to confirm the simulation results and experimental skeleton line good fit. The proposed method can well simulate the whole process of high-strength bolts in splicing joints and can be used in the analysis and calculation of high-strength bolts splicing nodes.