大型站臺雨棚風振響應時域和頻域法對比分析
王奇1，張杰1，校曙東2
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（1 浙江大學建筑設計研究院， 杭州 310028； 2 浙江展城建筑設計有限公司， 杭州 310005）［摘要］在對某大型火車站站臺雨棚屋蓋進行了剛性模型測壓風洞試驗的基礎上，采用時域內(nèi)的直接積分法和頻域內(nèi)的模態(tài)疊加法分別計算結構的風致響應，并以時域結果為依據(jù)評價頻域算法的計算精度。在通過模態(tài)疊加法計算風致響應時，分考慮各振型耦合作用的CQC法和不考慮耦合作用的SRSS法分別計算。計算結果表明對于此類大跨屋蓋結構振型耦合項的作用不可忽略。最后，還對結構的關鍵節(jié)點進行不同振型階數(shù)的模態(tài)疊加法計算，并進一步討論采用頻域法分析時參與振型數(shù)量的選取問題。［關鍵詞］大型站臺雨棚； 時域分析； 頻域分析； CQC法； SRSS法中圖分類號：TU312+.1 文獻標識碼：A 文章編號：1002-848X(2013)15-0088-03Contrast analysis of wind-induced response of large platform canopy by time and frequency domain methodWang Qi1, Zhang Jie1, Xiao Shudong2(1 Architectural Design and Research Institute of Zhejiang University, Hangzhou 310028, China; 2 Zhejiang Zhancheng Construction Design Co., Ltd., Hangzhou 310005, China)Abstract: By using the rigid model wind tunnel test data of a large railway station platform canopy, the wind-induced response of the steel roof was calculated by direct integration method in time-domain and mode superposition method in frequency-domain respectively, and the accuracy of the result got by frequency-domain method was judged by the time-domain result. When using mode superposition method to get the wind-induced response, the CQC method which takes into account the coupling of each mode and the SRSS method which does not think over the influence of coupling were proposed respectively, and the results show that the mode coupling of the long-span roof structure cannot be ignored. The response of the key structure nodes is superposed by using different numbers of modes in order to decide the effective number of modes.Keywords: Long-span platform canopy; time; frequency; domain analysis; CQC method; SRSS method; wind response作者簡介：王奇，工學博士，一級注冊結構工程師，Email：wangqi@zju.edu.cn。參考文獻［1］顧明，葉豐. 高層建筑風致響應的簡化分析方法［J］. 工程力學，2006，23(8):57-61.［2］NAKAYAMA M,SASAKI Y,MASUDA K.An efficient method for selection of vibration modes contributory to wind response on dome-like roofs［J］.Journal of Wind Engineering and Industrial Aerodynamics,1998，(73):31-43.［3］周暄毅，顧明，李亞明，等. 某大型博物館結構風致響應分析［J］. 振動與沖擊，2008，27(2):25-28.［4］顧明，黃鵬，周暄毅，等.北京首都機場3號航站樓風荷載和響應研究［J］.土木工程學報，2005，38(1):40-44.［5］周向陽，梁樞果，張其林. 武漢體育館鋼結構屋蓋風振響應分析［J］. 土木工程學報，2008，41(5):33-39.［6］顧明，周暄毅，黃鵬. 大跨屋蓋結構風致抖振響應研［J］.土木工程學報，2006，39(11):37-42.
