高拱坝非线性地震反应分析中横缝模拟方案研究

A Study on the Simulation Scheme of Joints in the Nonlinear Seismic Response Analysis of High Arch Dam

本文采用显示有限元结合人工透射边界的地震波动模拟方法和动接触力模型 ,研究了高拱坝地震反应分析计算模型中 ,合理模拟坝体非线性地震反应所需的横缝设置条数、位置和间距 ,得出了设置少数横缝能基本反映坝体应力反应 ,但横缝张开度则与横缝布置间距密切相关 ,准确模拟横缝开合情况需模拟横缝实际间距 。

In this paper, the wave simulation method in which the explicit finite element is combined with artificial transmitting boundary and the dynamic contact force model are used to study the requirement on the amount, the position and the distance of the joints to be considered in the seismic analysis of high arch dam. The conclusions are drawn that the stress distribution of the dam can be simulated by a few number of joints, but the openness of the joints will be evidently influenced by the distance of the joints, so it is necessary to consider the actual distance to simulate the opening and closing of the joints exactly. The top of arch crown and the dam abutments are the dangerous positions to occur a maximum opening.