考虑风与结构耦合作用的张弦梁结构风振响应分析

基于自回归(AR)模型考虑空间相关性,对张弦梁结构的随机脉动风进行数值模拟;利用有限元软件AN-SYS,考虑风速与结构速度的耦合作用,以材料阻尼模拟气动阻尼对结构进行风振响应分析,求得结构时程响应曲线;脉动风速样本的功率谱与目标功率谱比较结果吻合良好,表明所采用的随机过程模拟理论可靠,风速时程数据的计算机仿真程序有效;同时探讨参数变化对结构风振响应的影响.

Analysis of wind-induced vibrational response of beam-string structure to coupled action of wind with structure

On the basis of auto-regressive(AR) model and considering spatial correlativity,the stochastically fluctuating wind acting on the beam-string structure was numerically simulated.By using the finite element software ANSYS and considering the coupled action of wind velocity with the velocity of the structure,the wind-induced vibrational response was analyzed with a kind of aerodynamic damping simulated by the damping of the material,so that the time history response of the structure was found.It was shown by its comparison to the power spectrum of the sample of fluctuating wind velocity and the objective power spectrum that they were well consistent with each other,showing that the stochastic process simulation theory employed was reliable and the computer simulation program of data processing of time history of the wind velocity was valid.Meantime,the influence of parametric variation on the wind-induced vibrational response was discussed,also.