中文摘要：

在高拱坝地震反应的整体有限元分析中,由于计算规模的限制,通常难以准确模拟孔口等细部构造的影响。针对这一问题,本文研究了拱坝孔口地震反应分析的有限元子模型方法。以带横缝非线性拱坝为研究对象,分析了子模型计算的网格加密方式,线弹性材料情况下孔口局部区域的应力分布,以及非线性材料情况下孔口区域的损伤开裂情况。分析结果表明,加密的子模型与整体模型相应位置的计算结果吻合良好,子模型方法可以反映孔口细部结构的应力应变变化以及损伤分布特性,为高拱坝细部结构的动力反应分析提供了一种高效手段。

英文摘要：

Accurate representation of detailed structures is usually restricted by expensive computational costs in seismic analysis of high arch dams. To solve the problem, this paper describes a sub-model method that can refine the mesh in particular regions and its application to static and dynamic analyses of an orifice structure in a high arch dam with nonlinear joints. This model is first used to simulate the stress distribution in the orifice region for the case of linear elastic material, and then to calculate and examine the damage state for nonlinear material. The results indicate that the sub-model calculations with mesh refinement of the structure details agree well with those of a global orifice model. The sub-model method provides variations in both the stress/strain state and the damage characteristics in the orifice region and it proves to be an efficient approach to seismic response analysis of detailed structures in high arch dams.