索膜结构的非线性风振响应

Nonlinear Wind-Induced Vibration Response of Cable-Membrane Structures

索膜结构是一种新型大跨度空间结构形式,该类轻柔结构对风的作用十分敏感,风荷载往往是结构设计的控制荷载.文中运用有限元程序对一实际索膜结构进行了自振分析,然后用自编程序进行了结构风振响应的理论分析,分析中考虑了风向、风速、膜预张力等基本参数对结构响应的影响,发现索膜结构的自振频率随膜预张力的增加而明显增大,风速对结构风振响应也有较大影响.

As a new long-span space structure type, the cable-membrane structure is sensitive to wind due to its light weight and flexibility. Thus, the wind load is generally taken as the control load in the design of cable-membrane structures. In this paper, the free vibration of a practical cable-membrane structure is analyzed by using the finite element program, and the wind-induced vibration response of the structure is theoretically analyzed by using a self-developed program. In the analyses, the influences of some basic parameters, such as the wind direction, the wind velocity and the membrane prestress, on the wind-induced vibration response are considered. The results indicate that the natural frequency of the cable-membrane structure significantly increases with the membrane prestress, and that the wind velocity is closely related to the wind-induced vibration response.