Effects of submersion depth on wave uplift force acting on Biloxi Bay Bridge decks during Hurricane Katrina
Effects of submersion depth on wave uplift force acting on Biloxi Bay Bridge decks during Hurricane Katrina
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DOI：
10.1016/j.compfluid.2010.04.009
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发表时间：
2010-09
影响因子：
2.8
通讯作者：
H. Xiao;W. Huang;Q. Chen
中科院分区：
文献类型：
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作者：
H. Xiao;W. Huang;Q. Chen
比洛克西湾大桥的很大一部分被2005年卡特里娜飓风引发的水面波浪和风暴潮淹没和摧毁。本文采用波浪加载模型，研究了卡特里娜飓风作用下比洛克西海湾大桥的波浪力时程。模型采用流体体积法（Volume of Fluid， VOF）跟踪水面变化。为了获得卡特里娜飓风期间桥址的波浪参数和风暴潮高程，将风暴潮模型和波浪传播模型耦合进行水动力条件的后推。将耦合波涌模型的输出输入到波浪加载模型中，以模拟作用在桥面上的动力波浪力。研究了不同水深下5种不同桥面高程下的最大升力。采用波浪加载模型模拟了波桥相互作用过程。分析了桥梁附近的波浪剖面、速度场和甲板上的动波力。结果表明：在卡特里娜飓风极端风暴潮条件下，沉水桥面跨距上扬力大于桥面自重；此外，数值模拟表明，当风暴潮水位达到桥面顶部时，隆升波力最大。
A large portion of the Biloxi Bay Bridge was submerged and destroyed by surface waves and storm surge associated with Hurricane Katrina in 2005. In this paper, the time history of wave forces exerted on the Biloxi Bay Bridge during Hurricane Katrina was investigated by a wave-loading model. The Volume of Fluid (VOF) method was adopted in the model to track the variations of water surface levels. In order to obtain wave parameters and storm-surge elevation at the bridge site during Hurricane Katrina, a storm surge model and a wave propagation model were coupled to hindcast the hydrodynamic conditions. Outputs of the coupled wave–surge models were imported to the wave-loading model to simulate the dynamic wave forces acting on the bridge deck. In order to evaluate the maximum uplift wave force, five different bridge deck elevations submerged at different water depths were investigated. The processes of wave–bridge interaction were simulated by the wave-loading model. The wave profiles, velocity field in the vicinity of the bridge, and dynamic wave forces on the decks were analyzed. Results indicate that the uplift force on the submerged bridge deck span exceeded its own weight under the extreme wave and storm surge conditions during Hurricane Katrina. Moreover, the numerical simulations suggest that the maximum uplift wave force occurred when the storm surge water level reached the top of the bridge deck.