风向角对超高层建筑横风向效应的影响

随着建筑高度的增加，结构自振周期延长，抗侧刚度相对变小，风荷载效应增大。本文以200m高的高层建筑为研究对象，基于风洞试验所得的横风向风压时程数据对其结构进行了计算。试验模型缩尺比为1／400。试验取风向角从0°到45°，每级风向角增量为5°，模拟了两种地面粗糙度。对试验数据进行了迎风面和背风面气动效应的分析。考虑结构第一模态振型发生的位移，由振型分解法按Duhamel积分获得了结构顶点位移和顶点加速度，探讨了结构响应最大值和标准差与风向角、结构自振基频、地面粗糙度等因素的关系。研究表明：风荷载效应与风向角有密切的联系，结构最大响应一般发生在0°。

Wind direction effects on across wind dynamic response of high rise building

As building height increases,the effects of wind become more important.The high rise buildings are vulnerable to have large displacement amplitudes due to longer natural period and high flexibility.Dynamic response in across wind direction is calculated based on wind tunnel test.Time series data are required from the test models which simulated the building of height 200m with length scale 1/400.Wind direction is from 0 degree to 45 degree by increasing 5 degree.Two terrain roughness categories are simulate...