Research on the method for selecting dominant modes of wind-induced response for large-span roofs
Received:November 28, 2008  Revised:October 29, 2009
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KeyWord:large-span roof  wind-induced response  dominating mode  mode identification
李玉学 北京交通大学 土木建筑工程学院,北京
杨庆山 北京交通大学 土木建筑工程学院,北京
田玉基 北京交通大学 土木建筑工程学院,北京
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      Because of the characteristics of multi-mode participant of wind-induced vibration response for large-span roofs, it is an important matter to efficiently select dominant modes. In this paper, taking the correlation of mode and wind load in spatial distribution form as an criterion for selecting dominant modes. considering the uncertainty of wind load around the large-span roofs, according to the lower frequency modes with significant contribution to response, an indirectly way considering correlation of wind load and higher frequency modes is proposed. On the basis of this, the number of higher frequency participant modes are greatly reduced; then, an equivalent matrix of displacement response variance matrix is constructed, the diagonal element of equivalent matrix indicate the extent of contribution to the response of every participant modes. Based on this equivalent matrix, the modes which would participate the final calculation of the wind-induced vibration is further decided. At last, The effectiveness of the proposed method is verified by the wind-induced vibration of National Stadium main roof.