考虑库底吸收作用时挡水坝的抗震分析

本文基于分区加权余量法的思想,提出了一种配点-伽辽金混合方案研究考虑库底吸收作用时挡水坝的地震反应.分析中计及了库水和地基的动力相互作用效应,所建议的方法在水平或竖向地震作用下,对于垂直和倾斜坝面,可压缩和不可压缩水体,完全反射和部分吸收的库底条件,均可以采用统一的计算格式,并具有较高的计算效率.文中还通过所举算例,讨论了地基柔性、水体可压缩性和库底吸收作用等对水坝地震反应的影响.

Earthquake Analysis of Dams Considering Reservoir Bottom Absorption

Based on the thought of subregion weighted residual method,a mixed point collocation-Galerkin alculating model is presented to investigate the earthquake responses of dams while considering reservoir bottom absorption.The dynamic interaction effects of impounded water and foundation rock are considered.The present method can be used while the ground motion is assumed to be horizontal or vertical;the upstream surface of the dam vertical or inelined;the impounded water compressible or incompressible and the reservoir bottom absolutely reflective or partially absorptive.Numerical analysis show that the recommented method is very effective.The effects of foundation flexibility,water compressibility and reservoir bottom absorption on dynamic responses of darns are also discussed.