【摘要】 本文根据大跨柔性屋盖矩形截面结构的特点，从空间计算模型出发建立这类结构横风向共振响应的计算方法，得到了考虑多振型贡献的位移响应和等效风振力计算式；文中还对有关参数的取值进行了讨论。工程算例的结果表明，对于空间振动特征较强、固有频率较密集的屋盖类结构，考虑多振型贡献与只考虑共振振型贡献相比，计算结果有很大差别。更多还原

【Abstract】 In this paper, computational method is developed for crosswind resonant response of large span flexible roof structures with rectangular section from the point of view of 3 D model; expressions of resonant response computation in which multi mode contribution is taken into account are obtained; and the evaluation of certain coefficients is discussed. The result of an engineering example shows that, for roof structures with 3 D features, these expressions can give quite different results from those given by the expressions in which only the resonant mode is taken into account.更多还原