高层建筑悬挂式电缆桥架模拟地震振动台试验

Shaking Table Test on Suspended Cable Tray in High-Rise Buildings

摘要:

电缆桥架是高层建筑中的一类典型的非结构构件。为研究其抗震性能，采用足尺模型进行了2组模拟地震振动台试验。第1组试验针对配置了3种不同类型抗震支架的电缆桥架；第2组试验针对一个带有水平弯通与竖向弯通的L形立体电缆桥架。输入了多组地震动，对悬挂在钢结构平台上的电缆桥架进行了试验，分析了电缆桥架的损伤与破坏情况、动力特性、位移反应和加速度反应。试验结果表明，悬挂式电缆桥架的地震损伤主要集中在电缆托盘主次梁连接节点上，该节点失效导致次梁掉落。安装不同类型抗震支架的电缆桥架位移响应和损伤情况差异较为明显，而加速度响应差异较小。拉杆式抗震支架的抗震性能优于型钢式抗震支架，抗震强化式支架的抗震性能最强。相比于直线段桥架，弯通段桥架的地震损伤较小。增加抗震支架横向刚度和提高抗震支架附近桥架主次梁节点的强度有助于改善桥架的抗震性能。

Abstract:

A cable tray is a typical non-structural component in high-rise buildings. In order to study its seismic performance， two groups of simulated earthquake shaking table tests were conducted using full-scale models. The first group test aimed at cable trays equipped with three different types of seismic supports； the second group test aimed at an L-shaped three-dimensional cable tray with horizontal and vertical bend-way sections. Several groups of ground motions were input to the cable tray suspended on the steel platform. The damage， dynamic characteristics， displacement response， and acceleration response of the cable tray were described and analyzed. The test result shows that the seismic damage to the suspended cable tray is mainly concentrated at the joints of the main and sub beam of the tray component， and the failure of the joints causes the sub beam to fall. The displacement response and damage of cable trays with different types of seismic supports are significantly different， while the acceleration response is less different. The seismic performance of rod-type seismic support is better than that of section-steel-type seismic support. Moreover， the seismic performance of reinforced seismic support is the best. Compared with the straight section of the cable tray， the seismic damage to the bending section is smaller. Increasing the lateral stiffness of the seismic support and the strength of the main and sub beam joints of the tray component can improve the seismic performance of the cable tray.