超高层建筑风压的频域特性  

Frequency Characteristics of Wind Pressure on Super-Tall Buildings

作　　者：叶丰[1] 顾明[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）》2006年第3期285-290,共6页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金创新研究群体科学基金资助项目(50321803);教育部"高等学校骨干教师资助计划"资助项目

摘　　要：对10个典型的超高层建筑模型进行了细致的风洞试验,对模型表面的脉动风压系数的功率谱、水平相关系数和竖向相关系数、水平和竖向相干函数进行了细致分析,讨论了风场对脉动风压频域特性的影响.迎风面脉动风压的主频接近来流脉动风速主频;而侧面脉动风压的能量主要集中在漩涡脱落频率处.脉动风压的水平和竖向相干性均高于风速的相干性.10 typical super-tall building models of different cross-section shapes, aspect ratios and side ratios are tested in a wind tunnel. The power spectrum densities and coherence functions in horizontal and vertical directions are analyzed. The effects of terrain conditions on the power spectrum densities and coherence functions are discussed in detail. Some important conclusions have been finally drawn. The dominant frequencies of fluctuating wind pressures on the building models＇ windward walls are al- most the same as that in the natural wind, while those on the building models＇ side walls concentrate on the vortex frequencies. The horizontal and vertical coherences of the fluctuating wind pressures on the models are stronger than that of the natural wind.

关 键 词：超高层建筑 脉动风压 功率谱 相干函数 

分 类 号：TU973.213[建筑科学—结构工程]