索膜屋盖结构重量轻、柔度大、阻尼小，风荷载成为外力作用的主要因素。在索膜结构设计中，风振系数成为确定结构风荷载的主要参数。本文首先讨论了风振响应统计量与风振系数的概念，然后提出采用非线性有限元分析与人工神经网络相结合的新方法，寻找风振系数与平均风速以及与索膜预张力之间的关系。以一个大型索膜屋盖结构为例进行了分析，验证了本文方法的有效性。获得了风振系数随平均风速和索膜张力变化的规律，为索膜结构抗风设计提供了科学依据。

Wind load is the critical load applied to cable-membrane roof structures because of the special properties such as light weight, large flexibility, and small damping. In design of cable-membrane structures, the dynamic coefficient is a major parameter for determination of the wind load. In this paper, the wind-induced response statistics and the dynamic coefficients are firstly defined, then a new method that the nonlinear finite element analysis combines with the artificial neural network technique is proposed to find the relations between dynamic coefficient with the mean wind velocity and with the structural prestresses. A large scale cable-membrane roof structure is taken for example to show the validity of the proposed method. The rules of variation of dynamic coefficients with mean wind velocity and with the structural prestresses are obtained, which provide a scientific basis for wind-resistant design of cable-membrane structures.