大型矩形渡槽-水耦合体系的动力性能分析

Dynamic characteristics of large rectangular aqueduct-water coupling system

本文把任意拉格朗日-欧拉(ALE)方法用于分析大型矩形渡槽结构-水耦合体动力性能,并针对不同的水位、不同截面深宽比,研究渡槽结构在谐波激励、地震激励下的振动反应。研究表明,渡槽结构中水体的泼溅具有明显的非线性特征;渡槽中水位对耦合体动力特性影响极具规律性,但是随截面深宽比减小,水体振荡的非线性明显增强;渡槽结构截面深宽比选择合理,水体泼溅作用产生的倾覆力矩不会使槽体发生倾覆失稳,但是水体的大幅晃动产生的动水压力对渡槽槽身应力有显著的影响,在渡槽抗震设计中应给予足够重视。

The goal of this work is to study the dynamic characteristics of large-scale rectangular aqueduct using arbitrary Lagrangian Eulerian (ALE) method, and the reactions of aqueduct structure with different water level and different depth-width ratio under sinusoidal loads and earthquake action. Significant nonlinear behaviors arise from the sloshing of free surface, and with the increase of the water level the aqueduct-water coupling system follows the same law, but with the decrease of depth-width radio, nonlinear behaviors become stronger. Meanwhile, if the reasonable depth-width radio is selected, the aqueduct structure will not lose transverse stability under hydrodynamic pressure aroused by the sloshing effect of water, but it will change the distributions of stresses in the aqueduct structure, which should be paid more attention in the aseismic design of aqueduct structure.