X型超高层建筑扭转风荷载谱计算模型研究  

Computational model investigation of torsional wind load on high-rise building with X-shape

作　　者：金虎[1] 楼文娟[1] 沈国辉[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310027

出　　处：《空气动力学学报》2009年第2期147-153,共7页Acta Aerodynamica Sinica

摘　　要：通过X型超高层建筑模型多点同步测压风洞试验,文中研究了高层建筑扭转风荷载系数平均值、均方根值沿高度的变化规律。提出了X形高层建筑扭转动力风荷载功率谱密度函数的数学计算模型,并根据试验数据对模型参数进行了拟合,结果表明该计算模型与风洞试验结果吻合较好。文中还探讨了各层扭转动力风荷载的相干特性,以Vickery提出的尾流激励相干函数公式为计算模型,根据风洞试验数据利用最小二乘法拟合了模型参数,并给出拟合的计算参数。文中最后研究了扭转风荷载与顺风向、横风向风荷载的相干性,并提出了相应的数学计算模型,结果证明该模型与试验数据基本一致。Based on the multi-points synchronous pressure test in wind tunnel for the building with X shape, average distribution law and root mean square（tins） of torque coefficients along height direction are discussed. The computational model of power spectrum density（psd） for torque wind load is proposed and fitting calculation is conducted according to wind tunnel test data. The mathematical model is proved to agree well with test result. Coherence functions between the dynamic torque wind load of different heights are dis- cussed. On the premise of mathematical model for coherence functions proposed by Vickery, the computional parameters are fitted according to experimental data by least-squares procedure. Coherence curve between torque and alongwind and acrosswind wind load are investigated together. Mathematical models for each coherence curve are also proposed in this text. The models are tested to agree well with the experimental data in wind tunnel test.

关 键 词：高层建筑 扭转风荷载 功率谱 相干函数 

分 类 号：TU973[建筑科学—结构工程]