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以薄平板、闭口扁平箱梁和开槽扁平箱梁三种断面为研究对象进行小比例尺节段模型悬挂弹簧测振风洞实验,分析了紊流度和断面形式对桥梁振动演化特征和失稳风速的影响.研究结果表明:同一种桥梁断面在不同风场下的振动趋势是一致的,其位移响应均值和发散风不随紊流速度增加而增加;失稳风速从低到高依次为薄平板、闭口箱梁、开槽箱梁,而其失稳突发性从小到大顺序则刚好相反,薄平板和闭口箱梁发散时呈现出典型的硬颤振特征,而开槽箱梁发散时呈现出典型的软颤振特征.
Three kinds of thin-slabs, flat-bottomed flat box girder and slotted box girder are selected as research objects to test wind tunnel with small-scale section suspension spring. The effects of turbulence and section shape on vibration characteristics and instability of bridge Wind speed.The results show that: the same type of bridge section in different wind field vibration trend is consistent, the displacement response mean and divergent wind does not increase with turbulent flow rate increases; instability wind speed from low to high order thin flat , The closed box girder and the slotted box girder, and the instability of the box girder from the ascending order of the instability is just the opposite. When the thin flat plate and the box girder diverge, they show typical hard flutter characteristics, while the slotted box girder diverges A typical soft chatter characteristics.