【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.更多还原

【Abstract】 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.更多还原