拱坝有限元计算应力等效步骤可换性分析  

Convertibility of Stress Equivalence Steps for Finite Element Calculations of Arch Dam

作　　者：付雨晨 王亚军 余进 FU Yuchen;WANG Yajun;YU Jin(College of Hydraulic and Environmental Engineering,Three Gorges University,Yichang 443002,China;School of Marine Engineering Equipment,Zhejiang Ocean University,Zhoushan 316100,China)

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]浙江海洋大学海洋工程装备学院,浙江舟山316100

出　　处：《人民珠江》2025年第3期9-15,共7页Pearl River

基　　金：浙江省自然科学基金(LHY21E090003)。

摘　　要：拱坝等效处理后的主应力是拱坝应力重要的控制指标。针对常用的有限元等效应力法计算得到的主应力和大型有限元软件计算输出主拉应力、主压应力后直接等效处理的主应力是否一致的问题,结合实际工程开展某高拱坝基本组合工况应力变形计算,进而探讨了二者的可换性。研究结果表明:坝踵和坝趾应力依赖网格尺寸,等效处理后,应力集中能较好地消减;采用传统的有限元等效应力法等效步骤计算得到的主应力和由大型有限元软件输出的主应力直接进行等效处理的主应力较接近,误差基本在5%以内,2种等效步骤具有可换性。The principal stress of an arch dam after the equivalent treatment is an important control index of arch dam stress.To explore whether the principal stress calculated by the common finite element equivalent stress method is consistent with the principal stress obtained from direct equivalent treatment of the output principal tensile stress and principal compressive stress calculated by the large finite element software,this paper carried out the stress and deformation calculations of a high-arched dam under the basic combination of conditions through the actual project and then explore the convertibility between the two steps.The results show that the stresses in the heel and toe of the dam are dependent on the mesh size,and the stress concentration can be better reduced after the equivalent treatment;the principal stress calculated by the traditional equivalence step of the finite element equivalent stress method is closer to the principal stress obtained from direct equivalent treatment of the principal stress output by the large finite element software,and the error is basically within 5%,two equivalence steps are convertible.

关 键 词：拱坝 等效应力 有限元法 主应力 应力集中 

分 类 号：TV315[水利工程—水工结构工程]