基于风洞试验的高层建筑钢结构风致加速度研究

对钢结构高层建筑群中的典型狭长形建筑进行了表面风压的风洞模型试验,分别考虑了建筑为单体和群体的情况。利用试验获得的风荷载时程对该高层结构进行风振响应的动力时程分析,并着重对得到的与风致舒适度关联的加速度响应进行分析和讨论,对比群体效应对顺风向、横风向和扭转向峰值加速度的不同影响。结果表明,对于平面为狭长形的住宅钢结构高层建筑,扭转效应引起的风致峰值加速度不容忽略;而群体效应一般对结构的加速度呈增大趋势,而且对横风向及扭转向的增大程度通常大于对顺风向的程度。

RESEARCH ON WIND-INDUCED ACCELERATION OF HIGH-RISE STEEL STRUCTURE BASED ON WIND TUNNEL TEST

Wind tunnel test is carried out to measure the surface wind pressure on typical narrow and long building among steel structure building cluster under two conditions, including single building and building cluster. Dynamic time history of wind-induced vibration response of high-rise structure is analyzed in terms of wind load time history obtained in test and the acceleration response related to the obtained wind-induced comfort is analyzed and discussed. Different influences of group effect on peak acceleration of downwind, crosswind and torque wind. The analysis result shows that wind-induced peak acceleration caused by torque effect can not be ignored for steel structure high-rise residential building and that group effect generally has an increasing influence on acceleration of structure and the increasing degrees for crosswind and torque wind are higher than that for downwind.