基于ANSYS的斜拉桥抖振时域实用分析方法

抖振是大跨度桥梁易发生的一种风振形式.基于大型通用有限元软件ANSYS,本文提出了一种大跨度桥梁抖振时域实用分析方法.在该方法中,自激力是通过向有限元模型中添加气动刚度和气动阻尼单元的方式实现的.以深圳湾大桥为例,计算了该桥在不同风速和迎角下的抖振位移响应,与传统频域分析结果的比较表明了该方法的可行性.

Simplified buffeting analysis in time domain on the basis of ANSYS for cable-stayed bridge

Buffeting is one of recurring aeroelastic dynamic responses of long-span bridge. A simplified method used to predict the buffeting responses of long-span bridges in time domain is developed on the basis of ANSYS. In this method, the time domain transformation of self-exited force is realized by means of adding aerodynamic stiffness and aerodynamic damping element to FE model. As an engineering example, buffeting responses of Shenzhen Gulf Bridge are calculated under different wind velocities and angles. Results by the presented method are in conformity with those of traditional buffeting analysis in frequency domain.