考虑抖振影响的大跨度桥梁静风稳定性分析

1.41.2

工 程 力 学 101

竖向位移/m

0.8

0.60.40.2

1

-0.2

t/s

图16 东海大桥230m/s风速下跨中竖向位移时程 Fig.16 Time history of vertical displacement of east coast

bridge in middle span under 230m/s wind speed

3 结语

从以上西堠门大桥与东海大桥的静风稳定计算结果可知，忽略抖振响应的影响得出的静风失稳临界风速是偏于保守的。对于超大跨度的悬索桥，由于沿桥跨方向脉动风空间相关性的减弱，可能会大幅度地提高静力扭转发散的临界风速，甚至完全防止静风失稳的可能性，因此，对于超大跨度悬索桥，在均匀流下按静风稳定验算满足设计要求后可以不再考虑抖振响应对扭转发散的影响。从本文对西堠门大桥悬索桥(主跨1650m)与东海大桥斜拉桥(主跨420m)的静风稳定计算结果也可以看出，抖振响应对大跨度悬索桥静风稳定性影响显著，而对跨度较小的斜拉桥，其影响并不十分明显。 参考文献：

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