跨海大桥小尺度下部结构非线性波浪荷载分析

发布时间：2018-12-10 10:47

【摘要】：为研究跨海大桥桩基、桥墩等小尺度下部结构波浪荷载的非线性特性,以平潭海峡大桥N01号桥墩为例,采用不可压缩流体的N-S方程以及VOF自由液面追踪法,通过FLUENT实现非线性波的二维数值模拟,进而分析非线性波浪速度场和波面变化的特点,并通过Morison方程对比桥墩和单桩在线性波和非线性波下波浪荷载的差异,同时,为进一步研究浅水区非线性波浪特点,对不同直径下桥墩非线性波浪荷载的影响进行研究。研究表明:对于深水区的单桩,非线性波的非线性作用不明显;对于浅水区的桥墩,非线性波与线性波波浪力差异有14%,非线性作用较为显著;随着直径的增加,桥墩发生非线性波浪力峰值滞后现象;在跨海大桥设计中,波浪荷载的非线性应予以重视。
[Abstract]:In order to study the nonlinear characteristics of wave loads on small scale substructures of cross-sea bridge, such as pile foundation and pier, the N-S equation of incompressible fluid and the VOF free liquid level tracing method are adopted in the case of Pier N01 of Pingtan Strait Bridge. The two-dimensional numerical simulation of nonlinear wave is realized by FLUENT, and the characteristics of nonlinear wave velocity field and wave surface variation are analyzed. The difference of wave loads between pier and pile under linear and nonlinear waves is compared by Morison equation. In order to further study the characteristics of nonlinear waves in shallow water, the influence of nonlinear wave loads on piers with different diameters is studied. The results show that the nonlinear effect of nonlinear wave is not obvious for single pile in deep water area, and the difference between nonlinear wave force and linear wave force is 14 for bridge pier in shallow water area, and the nonlinear effect is obvious. With the increase of the diameter, the nonlinear wave force lag phenomenon occurs in the pier, and the nonlinear wave load should be paid more attention to in the design of sea crossing bridge.
【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金(51525804) 四川省创新研究团队科研项目(2015TD0004)
【分类号】：U443.2

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