基于风洞试验的大跨度钢桁梁悬索桥颤振性能研究  

Flutter performances of a long-span suspension bridge with steel trusses based on wind tunnel testing

作　　者：王凯[1] 廖海黎[1] 李明水[1] 

机构地区：[1]西南交通大学风工程试验研究中心,成都610031

出　　处：《振动与冲击》2015年第15期175-180,194,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51378442;51278435)

摘　　要：目前研究大跨度桥梁颤振性能的主要手段是节段模型风洞试验,而如何利用试验结果对桥梁主梁断面进行优化还没有得到彻底解决。以某大跨度钢桁梁悬索桥为工程背景,给出了桥梁设计基准风速的计算方法和结果。进行1∶48比例节段模型颤振振动试验,得出了主梁在各个攻角下的颤振临界风速。在最不利工况下,试验了下中央稳定板、上中央稳定板和水平稳定板对主梁颤振性能的影响,最后根据试验结果,在考虑安全、经济和美观等因素的条件下,选择最优气动方案,满足了桥梁抗风设计的要求。最后用1∶100比例全桥气弹模型试验验证了节段模型试验结果的可靠性。同时总结了大跨钢桁梁悬索桥颤振折算风速值一般位于数值4左右的规律,为今后类似钢桁梁悬索桥的颤振性能研究提供了借鉴和参考。Section model wind tunnel test is currently the main technique to investigate the flutter performance of long-span bridges. But a further study on applying test results in aerodynamic optimization of the bridges＇ main beam is still needed. Here,the calculation methods and results for base wind speed of bridge design were presented with an example of one long-span steel truss girder suspension bridge. The flutter critical wind speeds at different attack angles were obtained through 1： 48 proportion section model flutter tests. Under the most unfavorable working condition,tests to investigate the effects of upper central stabilized plate,lower central stabilized plate and horizontal stabilized plate on the flutter performance of the main beam were conducted. According to the test results,the optimal aerodynamic scheme was chosen to meet the requirements of the bridge wind resistance design in consideration of safety,economy and aesthetics.At last,the reliability of the results was verified with a 1： 100 proportion full bridge aerodynamic elastic model test. The law that the flutter converted wind speed of long-span steel truss suspension bridges is approximately 4 was concluded as a reference for the investigation of the flutter performance of similar steel truss girder suspension bridges.

关 键 词：钢桁梁 悬索桥 节段模型 颤振 气动优化 风洞试验 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]