输电塔螺栓节点滞回特性数值模拟研究

Numerical Simulation Study on Hysteresis Characteristics of Transmission Tower Bolt Joints

输电塔在振动过程中,螺栓节点会发生往复运动,但目前尚缺乏针对螺栓节点动力特性的研究.因此,对螺栓滑移进行了数值模拟,分析了其在循环荷载作用下的滞回性能,并通过参数分析研究了初始间隙、螺栓扭矩、接触面粗糙度对典型螺栓节点滞回性能的影响,为模拟螺栓滑移的动力响应提供了一种可供参考的滞回模型.结果表明,初始间隙越小、摩擦系数越大、初始扭矩越大,滞回曲线的极限变形越小,其中初始间隙对滑移变形的影响最大.

During the vibration of the transmission tower,the bolt joints will move back and forth,but there is still a lack of research on the dynamic characteristics of the bolt joints.The numerical simulation of joint bolt slip is carried out to analyze its hysteresis performance under cyclic loading.The effects of initial clearance,bolt torque,and contact surface roughness on the hysteresis performance of typical bolt joints are studied through parameter analysis,which provides a reference hysteretic model for simulating the dynamic response of bolt slip.The results show that the smaller the initial clearance,the larger the coefficient of the friction,the greater the initial torque,and the smaller the limit deformation of the hysteresis curve,in which the initial gap has the greatest effect on the slip deformation.