高层建筑的扭转风荷载功率谱密度  

Power Spectral Densities of Torsional Wind Loads on Tall Buildings

作　　者：唐意[1] 顾明[1] 全涌[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《同济大学学报（自然科学版）》2007年第4期435-439,共5页Journal of Tongji University:Natural Science

基　　金：国家自然科学创新研究群体基金资助项目(50321803);教育部高等学校骨干教师计划资助项目

摘　　要：利用高频天平技术,在四种不同风场中对13种不同尺寸的矩形超高层建筑的刚性模型进行了风洞试验,测量了这些模型的基底扭矩,即一阶广义扭转风荷载,考察了风场类型、模型长细比、厚宽比对高层建筑扭转广义风荷载谱的影响,并拟合出一个以风场类型、模型长细比、厚宽比为参数的高层建筑扭转广义风荷载谱的闭合表达式.通过与国外有关文献给出的结果的对比,验证了拟合公式的精度.13 models of typical square and rectangular tall buildings are tested with high frequency force balance （HFFB） technique in a wind tunnel; and the base torques of these models, namely the first mode generalized torsional wind forces, are obtained accordingly. Effects of parameters such as wind-field, models＇ aspect ratio and side ratio on the first-mode generalized torsional wind loads of tall buildings are then studied. New formulas for the power spectral densities （PSDs） of torsional wind loads of the tall buildings are formulated by using the nonlinear least-squares method. And by comparison with the results from the present wind tunnel test and other literatures, the precision and applicability of the present formulas are finally verified.

关 键 词：高层建筑 扭转风荷载 高宽比 厚宽比 公式 

分 类 号：TU312.1[建筑科学—结构工程]