反复荷载下圆钢管45°单插板节点承载力特性试验及理论分析

Experimental Study and Theoretical Analysis on Bearing Capacity Behavior of 45° Steel Tube-gusset Plate Connections Subjected to Cyclic Load

单插板节点是圆钢管塔结构的典型节点形式,因其结构简单、受力性能好、施工方便、易于管理和维护,被广泛应用于大跨越输电塔、特高压输电塔以及各种信号塔。以圆钢管45°单插板节点为研究对象,开展反复荷载作用下圆钢管45°单插板节点承载力试验和有限元模拟分析。通过试验和有限元结果的对比,分析了反复荷载作用下圆钢管45°单插板节点拉压承载力特性、应变发展规律和破坏模式。通过分析反复荷载作用下圆钢管45°单插板节点的荷载–位移曲线、骨架曲线和延性系数,研究了45°单插板节点的滞回性能。基于反复荷载作用下圆钢管45°单插板节点拉压承载力理论分析,提出了合理的节点设计建议,为输电线路工程圆钢管插板节点抗震设计提供参考。

The steel tube-gusset plate connection is a typical form of circular steel tubular joints. With the advantages of simple structure, good mechanical performance, easy management and maintenance,it is widely used in the long span transmission towers,UHV transmission towers and various kinds of signal towers. The 45°steel tube-gusset plate connections is selected to research the hysteretic behaviors of the steel tube-gusset plate connections subjected to the cyclic load by test research and finite element method. With the comparison of experimental and finite element analysis results,the tensile and compressive bearing capacity,the development of strain and the final failure mode of joints are analyzed. According to the load-displacement characteristics,the skeleton curve and the ductility of the 45° steel tube-gusset plate connections under the cyclic load,the hysteretic characteristics of circular steel tubular joints are researched. Based on the analysis of the tension and compression bearing capacity theory of the 45° steel tube-gusset plate connections subjected to the cyclic load,some reasonable design suggestions are put forward to offer a reference for the seismic resistance design of steel tube-gusset plate connections in transmission line.