大型三维矩形、U形渡槽地震响应对比分析

本文应用任意拉格朗日-欧拉(ALE)有限元方法对比分析大型三维排架支撑矩形、U形渡槽结构地震响应，以获得渡槽中动水压力资料。研究表明，渡槽中水体的晃动幅度十分显著，水体的大幅晃动显著地改变两种截面形式渡槽中水压力、槽体应力值及U形渡槽动水压力和应力分布，对矩形渡槽动水压力和应力分布规律影响不大。动应力分布的改变直接影响到大型预应力U形截面渡槽结构中预应力钢筋的有效性。在渡槽的抗震设计中，应充分考虑U形截面渡槽动水压力和动应力分布变化问题，动水压力应该作为一项主要的外荷载予以考虑。

Comparative analysis of earthquake responses of large 3D rectangular and U-shaped aqueduct

Arbitrary Lagrangian-Eulerian(ALE) method is employed to study the earthquake responses of frame-supported large-scale rectangular and U-shaped aqueduct structure to get data of hydrodynamic pressures. Significant sloshing effects arise from the free surface, and the large amplitude sloshing effects greatly change the value of hydrodynamic pressure and stress of rectangular and U shaped aqueduct, and significantly change the distribution of hydrodynamic pressure and stress of U shaped aqueduct, but do not have much effects on the regularity of the distribution of hydrodynamic pressure and stress of rectangular aqueduct. Such changes of distribution of hydrodynamic stress directly affect the effectiveness of prestressed steel bar in the large prestressed U shaped aqueduct structure. Therefore, the irregular distribution of hydrodynamic pressure and stress in the U shaped aqueduct should be paid enough attention, and the hydrodynamic pressure should be treated as an important external load in the seismic design of large aqueduct.