大跨度桥梁实用颤振控制方法

当大跨度桥梁面临颤振威胁时,合理有效的被动气动控制方法是避免其在服役期内发生风毁的最好保障.研究了适用于闭口箱梁等3种大跨度桥梁常用主梁的多种被动气动颤振控制方法.结果表明,中央开槽适合于提高气动稳定性能较好的闭口箱梁的颤振性能,风嘴则能显著提升气动外形钝化的开口边主梁的颤振临界风速,而中央稳定板几乎适合于各种主梁形式.此外,对检查车轨道等附属装置进行局部调位也可以起到良好的颤振控制效果,而多种控制方法的合理组合可以进一步发挥其控制作用.气动控制措施的效果与其设置参数紧密相关,针对各种控制方法的合理参数设置进行了研究和优化.

Practical Flutter Control Method for Long span Bridges

When faced with the threat of flutter instability, a reasonable and effective passive aerodynamic flutter control method is the best protection scheme for a long-span bridge from wind-induced collapse in its service life. The effects of several passive aerodynamic flutter control methods were investigated for three widely adopted main girders for long-span bridges including closed box girder. It can be concluded that each girder section has different optimum control method. While central slotting best suits closed box girder, fairings are able to improve the flutter performance of more bluff girder section significantly, and central stabilizer can be applied to all three girder sections. In addition, adjusting the position of inspection rails can also achieve the flutter control goal, and a rational combination of different methods may have extra advantages. It should be noted that the flutter control effect of a method is largely influenced by its parameters, so the appropriate setting and optimization of detailed parameters for different flutter control measures are also investigated.