基于风洞试验的大跨度钢桁梁悬索桥颤振性能研究

发布时间：2018-11-29 09:26

【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。
[Abstract]:At present, the main method to study flutter performance of long-span bridges is wind tunnel test with segmental model. However, how to optimize the cross-section of the main girder by using the test results has not been thoroughly solved. Taking a long-span steel truss suspension bridge as the engineering background, the calculation method and results of the design datum wind speed of the bridge are presented. The flutter vibration test of the 1:48 proportional segment model was carried out and the flutter critical wind speed of the main beam at each angle of attack was obtained. Under the most unfavorable working conditions, the effects of the lower central stable plate, the upper central stabilized plate and the horizontal stabilized plate on the flutter performance of the main beam are tested. Finally, according to the test results, the safety, economy and beauty are considered. The optimal aerodynamic scheme is chosen to meet the requirements of wind resistant design of bridges. Finally, the reliability of the results of the segmental model test is verified by using 1: 100 proportional full bridge Aeroelastic model test. At the same time, the law that the value of flutter velocity of long-span steel truss suspension bridge is generally about 4 is summarized, which provides reference and reference for the research of flutter performance of similar steel truss suspension bridge in the future.
【作者单位】：西南交通大学风工程试验研究中心;
【基金】：国家自然科学基金(51378442,51278435)
【分类号】：U441.3

【参考文献】