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混凝土重力坝的地震损伤破坏模拟

发表时间:2011-07-31  浏览量:1273  下载量:427
全部作者: 王娜丽,钟红
作者单位: 大连理工大学建设工程学部
摘 要: 在宏观均质假定的基础上考虑局部易损区的细观非均匀性,采用带残余强度的幂函数下降段损伤演化模型,以最大拉应力准则和摩尔库伦准则作为损伤判断阈值,在ANSYS二次开发的基础上研究混凝土重力坝在地震作用下的损伤破坏情况。通过比较论证3种不同材料特性下Koyna坝应力情况,考虑混凝土材料的细观非均匀性和非线性的必要性;通过Koyna坝只计拉损伤和同时计拉损伤和压损伤2种情况的模拟结果表明:混凝土坝的开裂主要由于受拉破坏引起的,重力坝上下游折坡处和坝踵是抗震薄弱部位,在设计中应着重加强。
关 键 词: 水工结构;混凝土重力坝;细观非均匀性;损伤破坏;数值模拟
Title: Seismic damage simulation of concrete gravity dam
Author: WANG Nali, ZHONG Hong
Organization: Faculty of Infrastructure Engineering, Dalian University of Technology
Abstract: Based on macro homogeneous assumption, this paper considered local vulnerable area�s microscopic heterogeneity, used the damage evolution model with power function decline and residual strength, and applied maximum tensile stress criterion and Moore coulomb standard as damage judgment�s threshold value, and then studied concrete gravity dam�s seismic damage through ANSYS secondary development. Stress compare of Koyna in three material characteristics showed the necessity of considering concrete�s microscopic heterogeneity and non�linear; The compare of Koyna�s simulation results with tensile damage only and tensile� compression damage showed that cracking of concrete dam are mainly due to tensile failure, and the heel and head is seismic weak positions, which should be strengthened in the design.
Key words: hydraulic structure; concrete gravity dam; microscopic heterogeneity; damage; numerical simulation
发表期数: 2011年7月第14期
引用格式: 王娜丽,钟红. 混凝土重力坝的地震损伤破坏模拟[J]. 中国科技论文在线精品论文,2011,4(14):1326-1333.
 
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