大跨屋盖结构位移风振系数研究

Study on Wind Displacement Factor on a Rigid Model of Long-Span Roof Structure

以株洲体育中心大跨屋盖结构为背景,基于刚性模型测压试验的脉动风荷载时程,通过有限元方法在时域内对大跨屋盖结构进行了分析,研究了不同情况下结构的位移风振系数及其变化规律,并与荷载风振系数进行了比较.结果表明:与荷载风振系数不同,大跨屋盖结构位移风振系数对位置以及阻尼比的变化不敏感,且结构整体的几何非线性对结构的荷载风振系数和位移风振系数影响相对均较小.在计算风振系数时,可以荷载风振系数为主,位移风振系数作为前者的补充.

With program and software interface technology,based on the result of wind pressure measurements test of long-span roof of Zhuzhou sports center,the wind displacement factor analysis is performed in time domain on ANSYS working platform.The regularities of wind displacement factor changing with wind direction is studied,and effect of different structure parameters and calculating methods on the wind load factor of the structure under different wind direction is also discussed.The results are helpful for designers.