输电铁塔主材螺栓连接节点滞回性能研究

Research on hysteresis behavior of bolted joints in transmission tower leg

针对输电铁塔中典型的主材双肢螺栓连接节点,考虑主材节点中螺栓与螺栓孔间为最小间隙、正常间隙和最大间隙三种不同情况,通过有限元仿真分析,研究了主材节点在循环载荷作用下的滞回性能,获得了节点的滞回曲线、骨架曲线、刚度退化曲线和耗能系数曲线。给出了螺栓构造间隙对节点滞回曲线的影响规律,为输电铁塔动力响应分析提供了理论基础。

The typical lap-splice bolted joints in the transmission tower are studied with considering the bearing,normal and maximum construction clearance between the bolt and hole.The hysteresis performance of the bolted joint under cyclic load is studied with finite element simulation method,and the hysteresis curve,skeleton curve,stiffness degradation curve and consuming coefficient curve of the joint are presented.The influences of bolt construction clearance on the hysteresis curve of the joints are presented,which provide the theoretical basis for the dynamic analysis of transmission tower.