基于风洞试验的大跨度钢桁梁悬索桥颤振性能研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (15) : 175-180.

论文

王凯，廖海黎，李明水

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Flutter Stability Study of A Long-span Suspension Bridge with Steel Truss based on wind tunnel testing

WANG Kai, LIAO Hai-li, Li Ming -shui

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文章历史 +

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

Section model wind tunnel test is currently the main technique to investigate the flutter performance of long-span bridges. But further study about applying the results to the aerodynamic optimization of the bridge main beam is still needed. Methods and results of selecting design wind parameters of the bridges in the mountainous valley are determined by using the example of one long-span steel truss girder suspension bridge. The flutter critical winds at different attack angles are obtained through the 1:48 proportion section model flutter test. Under the most unfavorable working condition, tests to investigate the effects that upper central stabilized plate, lower central stabilized plate and horizontal stabilized plate have on the flutter performance of the main beam were conducted. According to the test results, the optimal aerodynamic measure was chosen to have met the requirements of the bridge wind resistance in consideration of safety, economy and aesthetics. At last, the credibility of the results is confirmed by the 1:100 proportion full bridge aerodynamic elastic model test. That the flutter reduced wind speed of long-span steel truss suspension bridges stays approximately at 4 is concluded as a reference for the investigation of the flutter performance of similar steel truss girder suspension bridges.

导出引用

王凯，廖海黎，李明水. 基于风洞试验的大跨度钢桁梁悬索桥颤振性能研究[J]. 振动与冲击, 2015, 34(15): 175-180

WANG Kai, LIAO Hai-li, Li Ming -shui. Flutter Stability Study of A Long-span Suspension Bridge with Steel Truss based on wind tunnel testing[J]. Journal of Vibration and Shock, 2015, 34(15): 175-180

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