摘要
采用离散涡(DVM)及风洞测力方法,确定主梁静气动力系数.采用抖振时域方法,计算最大双悬臂状态时的抖振响应,与风洞试验结果进行对比分析,计算中阻尼系数由气弹模型实测阻尼比确定;由于气弹模型设计中阻尼比相似不能够实现,故修正计算结果,探讨阻尼比对抖振响应的影响;最后采用两种抗风分析方法——阵风系数法和抖振时域分析法,分别对结构进行分析计算.实例分析的计算结果表明,按阵风系数法得到的横桥向响应偏于保守.
Static aerodynamic coefficients of main girder were determined by the Discrete Vortex Method（DVM） and measurement of static forces in wind tunnel. Time-domain buffeting method was used to calculate buffeting-induced responses at the maximum double cantilever stage, which were compared with the wind tunnel test results, and damping coefficients were determined by measured damping ratio of aeroelastic model in the analysis. Because the required damping ratio can not be achieved in the design of an aeroelastic model, a proper modification for the dynamic response is carried out and the influence of damping ratio on buffeting-induced responses is discussed. At last, wind-resistant analysis is made by means of gust coefficient method and time-domain buffeting method, and the results show that the transverse response calculated with gust coefficient method is conservative.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第2期166-170,共5页
Journal of Tongji University:Natural Science
基金
国家自然科学基金重大资助项目(50478109)
关键词
桥梁施工
抗风稳定性
抖振时域
最大双悬臂状态
阻尼比
阵风系数法
construction stage
wind-resistant stability
time-domain buffeting
the maximum double cantilever stage
damping ratio
gust coefficient method
