钢管柱支承单层网壳结构抗冲击动力性能试验研究

Shock resistance dynamic performance tests on single-layer dome supported with steel tube column

为了研究带有下部支承柱的单层网壳结构在斜向冲击下整体结构的抗冲击动力性能,对下部支承为钢管柱的单层K6型网壳结构进行了斜向冲击试验与仿真模拟分析,得出结构的破坏模式与动力响应特性;基于大比例的钢管柱支承网壳模型冲击试验,通过动态应变仪和位移传感器、加速度传感器,获取冲击物斜向入射冲击结构时关键杆件和关键节点的时程响应数据,借助高速摄影机拍摄冲击历程、结构各阶段变形及破坏形态,并将试验研究与仿真结果进行分析对比。研究结果表明：钢管柱支承单层网壳结构在斜向冲击试验中的破坏模式可以总结为两种;斜向冲击试验所得动力响应结果与仿真分析吻合;随着冲击能量的增大,上下部结构的响应都随之增大,且下部柱大于上部网壳;随着冲击高度的提高,结构上下部的位移与应变均增大,加速度的变化情况无明显规律;动力响应由冲击部位传至整体结构的时间约为1.2~6.1ms。

This paper studies the shock resistance dynamic performance of single-layer dome supported with steel tube column subjected to inclined impact load.Failure modes and dynamic response characteristics are got through oblique impact test and simulation analysis on a K6 type single-layer dome supported with steel tube column.Based on the large scale reticulated dome model,strain-time history curve of key bars,displacement-time history curve and acceleration-time history curve of key nodes are collected by dynamic strain gauges,dynamic displacement sensors,and acceleration sensors under oblique incident impact action.The impact process,structural deformation and failure modes are photographed using high speed camera.The results show：the failure modes of single-layer reticulated dome supported with steel tube column can be divided into two kinds in impact test.The results of the impact test agree well with those of simulation analysis.The upper and lower structural responses are increasing with the increase of the impact energy,which of the lower column is greater than the upper dome.With the increasing of the height of the impact point height,both the upper and lower structural displacement and strain increase,and acceleration change has no obvious regularity.The dynamic transmission from the impact site to the whole dome is about 1.2~6.1ms.