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通过建立系列有限元分析模型研究了外伸端板高强度螺栓抗拉连接的力学性能,分析中考虑了不同端板厚度和螺栓直径变化对连接节点受力性能的影响。研究结果表明,高强度螺栓总拉力应由外加荷载引起的螺栓拉力和端板弯曲变形产生的撬力组成。通过分析拟合得到由外加荷载产生的螺栓拉力和螺栓撬力的分布模型和计算公式,并分别给出摩擦型和承压型两种类型的高强度螺栓考虑撬力影响抗拉连接承载力计算公式。
Through the establishment of a series of finite element analysis models, the mechanical properties of tensile connections of high strength bolts with extended end plates were studied. The influences of different end plate thicknesses and bolt diameters on the mechanical behaviors of the joints were considered. The results show that the total tension of high strength bolts should be caused by the applied load caused by the bolt pull and the end plate bending force generated prying force composition. Through the analysis and fitting, the distribution model and the formula of the bolt pull force and the bolt prying force generated by the applied load are obtained. Two types of high strength bolts, friction type and pressure type, are given respectively, which are calculated considering the influence of prying force on the bearing capacity of tensile connection formula.