某带肋局部双层椭球壳的自振特性和风振动力响应分析

Mode shapes and wind-induced response analysis for a partially double layer elliptic shell

通过对某影视艺术中心屋盖结构体系的频率和模态分析显示出,此带肋局部双层椭球壳结构的自振频率密集,采用频域法进行风振响应分析时应该考虑多阶振型的影响。但从各阶振型对系统能量的贡献可知,仅考虑前20阶振型及各振型之间耦合项的影响,即可满足结构设计的需要。

The frequencies of a partially double layer elliptic shell are densely distributed through analyzing the frequencies and modes of a movie and video center roof,so many modes must be taken into account when windinduced response is analyzed adopting frequency domain method.According to the contributions of modes to strain energy of system,the contribution of modes to windinduced response of structures is defined.The windinduced response was analyzed considering the first 30th modes,and the contribution of each mode to energy of system is obtained.It is shown that the accuracy can meet the requirement of the structural design when including the first 20th modes and the coupling of modes for this roof structure.