某游泳跳水馆钢屋盖结构自振特性和风振动力响应分析

MODE SHAPES AND WIND-INDUCED RESPONSE ANALYSIS FOR A SWIMMING AND DIVING HALL

通过对某游泳跳水馆屋盖结构体系的频率和模态分析发现 ,此类斜拉筒壳结构的自振频率密集 ,振型分布很有规律。根据不同模态对整个结构在脉动风作用下应变能的贡献多少来定义模态对结构风振响应的贡献 ,对此屋盖结构选取前 2 0阶振型进行风振响应分析 ,得到了各阶振型对系统能量的贡献 ,对此屋盖结构 ,考虑前 2 0阶振型的影响 ,可满足结构设计的需要 ,但必须考虑各振型之间的耦合。

By analyzing the frequencies and modes of a swimming and diving hall roof,the densely distributed frequencies and the regularity of modes shapes of the structure are obtained.According to the contributions of the modes to a strain energy of the system,the contribution of the modes to wind-induced response of the structures is defined.The wind-induced response was analyzed considering the first 20th modes,and the contribution of each mode to energy of the system is obtained.It is shown that the accuracy can meet the requirement of the structural design when including the first 20th modes for this roof structure,and the couplings of the modes must be taken into account.