地震波输入角度对钢网格盒式束筒结构响应的影响

为研究空间钢网格盒式束筒结构在地震作用下的弹塑性性能,采用ETABS有限元软件建立数值模型.通过改变地震波输入角度,对钢网格盒式束筒结构进行罕遇地震作用下弹塑性时程分析.从结构顶点时程位移、基底剪力、层间扭转角及各构件塑性发展进行对比分析,寻求对结构不利的地震波输入角度.分析结果表明:坐标轴方向并不是地震波作用的最危险方向,与结构X轴成45°左右的方向对该结构的影响最大;盒式束筒结构抗震防线明确,具有良好的抗震性能.

Effects of Seismic Wave Input Angle on Response of Steel Grid Cassette Bundled Tube Structure

In order to study the elastic and plastic properties of space steel grid cassette bundled tube structures under the earthquake action, the numerical model was established using ETABS software. The elastic-plastic time-history analysis of the structures under rare earthquake action was performed with different input angles of seismic waves. The analysis results including structural top displacement, the base shear force, floor displacement angles and plastic development of components are compared to find unfavorable seismic wave input angle against structure. Analysis results show: the most unfavorable direction of the earthquake actions is not the X axis, but is the angle of 45° to X axis; the cassette bundle tube structure has good seismic performance.