复杂周边环境下超高层建筑的强风动力响应特性  

Dynamic response characteristics of super high-rise building subjected to strong wind in the complicated ambient circumstance

作　　者：黄鹏[1] 陶玲[1] 全涌[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：《振动与冲击》2009年第12期140-145,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(50708082;90715040;50878159);国家自然科学基金创新研究群体计划(50621062)联合资助

摘　　要：对处于强风地区复杂周边环境下的某方形截面超高层建筑分别进行了刚性模型测压试验和高频天平测力试验。基于测压试验得到的结构表面的风压分布,采用随机振动理论,进行了风致振动响应计算,结果表明其上下一致的方形截面导致漩涡脱落强烈,强风下横风向涡激响应非常显著,值得重视。在高频天平测力试验得到的基底弯矩谱上同样可以看到在涡脱频率附近的显著峰值。基于基底弯矩谱试验值同样计算了结构的风致振动响应,其结果与基于刚性模型测压试验计算的各响应非常接近,从而验证了2种试验方法的可靠性。Both rigid model pressure measurement tests and high-frequency-force-balance tests were conducted on a super high-rise building with squared cross-section,located in complicated ambient circumstance and subjected to strong wind.The surface pressure distribution derived from the rigid model pressure measurement tests was used to calculate the wind-induced vibration response by virtue of random vibration theory.The results show that the vortex shedding is very strong due to the consistent squared cross-section from top to bottom of the building,and the across-wind vortex-induced response under strong wind is badly remarkable,which should be paid attention to.Meanwhile,the peak of the base moment spectra obtained from high-frequency-force-balance tests on the building is also significant at the frequency near which the vortex was shedding.The wind-induced vibration response was also computed based on the base moment spectra,and the results turn out to highly approach to those based on the rigid model pressure measurement and thus the reliabilities of the two experiment methods were verified.

关 键 词：超高层建筑 方形截面 风洞试验 基底弯矩谱 横风向响应 

分 类 号：TU392[建筑科学—结构工程]