基于无限元边界模型的高拱坝损伤开裂数值分析  

Numerical analysis on damage and cracking of high arch dam based on infinite element method

作　　者：杜玉涛 朱彤[1] DU Yutao;ZHU Tong(State Key Lab of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学海岸及近海工程国家重点实验室

出　　处：《人民长江》2019年第9期175-179,213,共6页Yangtze River

基　　金：国家自然科学基金重大研究计划培育和集成项目(91215301)

摘　　要：基于ABAQUS中的混凝土损伤塑性模型,分别建立了考虑地基辐射阻尼效应的有限元—无限元耦合模型和无质量地基模型,讨论高拱坝在设计地震作用下采用两种地基模型得到的应力、横缝开度、坝顶顺河向位移和损伤开裂情况。结果表明:无质量地基模型与无限元边界模型相比,坝体拱向和梁向应力最大值明显增加,增大了坝体的横缝开度和坝顶顺河向位移,同时坝体的损伤开裂情况更为严重。因无限元边界模型能考虑地基的辐射阻尼效应,能真实地反映坝体的地震响应,而无质量地基模型夸大了坝体的地震响应,故用无质量地基模型进行坝体的抗震分析是过于保守的。Based on the concrete damage plasticity model in ABAQUS,a finite element-infinite element coupling model considering the radiation damping of the foundation and a massless foundation model were established.The stress,the transverse joint opening,the displacements of the crest along the stream direction and the damage cracking condition of the high arch dam under design ground motion were discussed.The results show that,compared with the infinite element boundary model,the maximum stress of massless model in arch and beam directions of the dam increases obviously,the transverse joint opening of the dam and the displacements of the crest along the stream direction are increased,and the damage cracking condition of the dam body are more serious.Because the infinite element boundary model can truly reflect the seismic response of the dam considering the radiation damping of the foundation,and the massless foundation model exaggerates the seismic response of the dam,so it is too conservative to use the massless foundation model to analyze the seismic response of the dam.

关 键 词：辐射阻尼 有限元 无限元 无质量地基 拱坝 抗震分析 

分 类 号：P319[天文地球—固体地球物理学]