高强螺栓承压型连接抗剪承载力计算

针对现行规范在计算高强度螺栓承压型连接的抗剪承载力时不考虑连接板之间的摩擦力,与承压型高强螺栓的受力机理不相符的问题,采用虚功原理推导了预拉力模拟方法,并采用有限元方法对这一连接的受力过程进行分析.分析结果表明,当连接的承载力由螺栓强度控制时,若不考虑构件间的摩擦力,则高强螺栓承压型连接的承载力会被低估.在数值分析的基础上对这种连接方式的抗剪承载力提出了考虑连接板间摩擦力的计算方法.与有限元结果比较,该计算方法的误差在10%以内.

Study on Shear Capacity of High-strength Bolted Bearing-type Joint

The friction forces between connecting plates are not taken into account in the shear capacity calculation of high-strength bolted bearing-type joints in the current Codes, which is not consistent with the bearing mechanism of high strength bolts.The principle of virtual work was adopted to go through pre-stress simulation method, and the finite element method was adopted to analyze the loading process of bearing-type joints.The results show that, without considering the friction forces between connecting plates, when the bearing capacity of connection is controlled by bolt strength, the shear capacity of high-strength bolted bearing-type joints will be underestimated.In this paper, based on numerical simulation, a reasonable method considering friction forces between connecting plates was proposed to calculate shear capacity of high-strength bolted bearing-type joints.Compared with FEM results, the error of new method is less than 10%.