钢结构工业栈桥风速时程分析

Time course analysis of wind speed on steel industrial bridges

运用AR模型自回归过滤技术,考虑空间相关性,对栈桥各点进行随机风速时程模拟;采用SAP2000有限元分析软件建立了钢结构栈桥有限元模型,利用AR法获得的时程曲线并对栈桥结构体系进行风速时程分析。研究表明:钢结构栈桥体系属柔性结构,对风荷载作用敏感,不能忽略高阶振型对风振响应的影响;将风速时程分析得出的位移风振系数与规范规定风振系数进行对比,得出风荷载沿栈桥体型的分布规律,建议工程设计时考虑风速时程分析法进行设计校核。结论对实际工程抗风设计具有指导意义。

Considering the spatial correlation,AR model regression filter technology is used for random wind speed time history simulation at various points on the gallery.A model established by SAP2000 software and time history curve from AR method is used to study wind speed time history analysis on the gallery structure system.The conclusion shows that:the vibration mode of steel structure gallery is dense and sensitive to wind and can’t ignore the higher order modes contribution to wind vibration response;The distribution along the gallery particle from the wind vibration coefficient of displacement and the wind vibration coefficient of load code shows that the precision of the latter is insufficient for the structure that it is dense and not uniform along the vertical distribution.Advice when engineering design wind speed time history analysis method is adopted to design check.The conclusion has guiding significance for the wind resistant design of practical engineering.