关键词: 索膜结构, 模态分析, 风致振动, 非线性响应

Abstract:

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.

Key words: cable-membrane structure, modal analysis, wind-induced vibration, nonlinear response