高层钢结构建筑横向支撑地震动力响应分析

Seismic Response of High-rise Steel Structure Buildings with Transverse Bracing

为测试高层钢结构建筑抗震性能,在有限元模型中以某高层钢框架结构办公大厦作为研究对象,测试其横向支撑地震动力响应状况。选取地震峰值加速度为200 cm/s^2的El-Centro波作为地震波输入,采用瞬态动力方法分析不同楼板厚度下建筑地震模拟响应,得到建筑顶层位移时程曲线;在SAP2000结构软件中分析建筑工程添加横向支撑前后的反应谱,记录各楼层垂直与水平方向位移与层间位移角。得到如下结果:高层钢结构建筑在地震响应下产生的位移不随楼板厚度的增加而增大,楼板厚度为100 mm、170 mm时位移波动显著;添加横向支撑后,建筑水平刚度显著提升,同理,添加横向支撑后横向层间位移角的最大值变化较大,且低于1/250,符合相关建筑标准。

To test the seismic performance of high-rise steel structures,we used a high-rise steel-frame office building as our research object.Using the finite element model,we analyzed the seismic response of its transverse bracing.As the input wave,we used the El-Centro wave with a peak acceleration of 200 cm/s^2.To analyze the seismic simulation response of the building with different slab thicknesses,we used the transient dynamic method and obtained the displacement time-history curves at the top floor of the building.Using SAP200 software,we analyzed the response spectra of the building before and after setting the transverse bracing,then recorded the vertical and horizontal displacements and the story drift ratio.The results are as follows:(1)The displacement of the high-rise steel structure building under earthquake did not increase with increased slab thickness,and displacement fluctuation was obvious at slab thicknesses of 100 mm and 170 mm.(2)After setting the transverse bracing,the horizontal stiffness of the building was obviously improved,and the maximum story drift ratio varied greatly,but was always less than 1/250,which meets the requirements of the relevant building code.