大跨度屋盖结构考虑模态耦合的抖振共振响应分析方法

Analytical approach considering modal coupling effects for buffeting resonant response of large-span roof structures

提出了可考虑模态耦合效应的共振响应分量近似形式,并基于此得出用于计算风振响应共振分量的修正SRSS法。最后将该方法运用于上海南站工程屋面结构的共振响应分析以检验其正确性及精度。本方法为进一步建立复杂大跨度屋盖结构等效静力风荷载方法奠定了基础。

Resonant equivalent static wind load is usually described as the inertial force. Holmes proposed an equation for equivalent static wind loads of structures with multi-modes recently. But this method can＇t take modal coupling effects into account in the resonant response component. To overcome the shortcoming of this method, an approximate variance solution for resonant responses is derived, which leads to a modified SRSS method. Then the roof structure of Shanghai South Railway Station is taken as an example to show the accuracy of the method. The modified SRSS method considering modal coupling effects presented here lays the foundation for the equivalent static wind load of large-span roof structures.