大型超高层建筑的随机风振响应分析  

Random wind-induced response analysis of a large-scale and high-rise building

作　　者：卜国雄[1] 谭平[2] 张颖[3] 周福霖[2] 

机构地区：[1]哈尔滨工业大学深圳研究生院,深圳518055 [2]广州大学教育部工程抗震减震与结构安全重点实验室,广州510405 [3]湖南大学土木工程学院,长沙410082

出　　处：《哈尔滨工业大学学报》2010年第2期175-179,共5页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50608021);高等学校博士学科点专项科研基金资助项目(20061078001)

摘　　要：大型超高层建筑结构具有自由度数庞大、小阻尼及振型密集等特点,针对传统方法在处理大型复杂实际结构受多点随机激励中存在计算效率比较低或精确性不高等不足,提出了基于虚拟激励法的复杂超高耸结构的随机风振响应分析方法.运用虚拟激励法将脉动风荷载作用下的多点激励转化为简谐虚拟激励向量,并根据平稳随机理论推导出相应风振响应的表达式,自动计入了多点风激励的空间相关性和振型间的相关性.以目前在建的深圳第一高楼——深圳金基大厦为算例,分析结果验证了方法的有效性和准确性,可以提高多点随机激励响应的计算效率和精确度,在大型高层实际工程风振响应计算分析中有较强的实用价值.Considering the shortages of traditional methods in calculating a large-scale and complex structure with multiple-point wind excitations, the random wind-induced response analysis of large-scale and high-rise structures based on pseudo excitation method is presented. The multiple-point fluctuating wind loads are changed into harmonic pseudo-excitation vector by using the pseudo-excitation method, then the expression of wind-induced response can be derived according to the stationary stochastic theory which can automatically take the space correlation of multiple-point wind-excitations into account. The highest building under construction in Shenzhen city, Jin-Ji Tower, is employed as a numerical example. Results show that this method exhibits high accuracy and efficiency, and it is valuable in the analysis of stochastic wind-induced response of real complex and high-rise tower structures.

关 键 词：虚拟激励法 大型超高层结构 风致响应 多点激励 耦合性 

分 类 号：TU311[建筑科学—结构工程]