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土石坝抗震极限能力有限元分析的上限法

发表时间:2014-01-31  浏览量:1387  下载量:606
全部作者: 迟世春,杨昕光
作者单位: 大连理工大学水利工程学院
摘 要: 有限元极限分析一般将Mohr-Coulomb强度线性化,不适合具有明显非线性特征的土石坝极限分析。研究将极限分析的二次锥规划(second-order cone programming, SOCP)数学模型转化为对偶问题的“静力形式”,可求解坝体内部应力,从而用迭代的方法确定材料在非线性强度准则下的等效剪切强度,应用于土石坝极限抗震能力分析,得到该问题的上限解。
关 键 词: 水工结构;土石坝;极限分析;上限定理;非线性破坏准则
Title: Upper bound method for aseismatic ultimate capacity analysis of rock-fill dams using finite elements
Author: CHI Shichun, YANG Xinguang
Organization: School of Hydraulic Engineering, Dalian University of Technology
Abstract: The Mohr-Coulomb criterion is taken as a linearized yield surface in limit analysis using finite elements, but it can’t be used directly in earth-rock material possess nonlinear strength properties by upper bound method. In this paper, a static form, which is corresponding dual second-order cone programming (SOCP) problem of the upper bound limit analysis, is formulated. By solving the dual problem, the distribution of stress of slopes can be obtained. Then, the equivalent shear strength parameters of materials with nonlinear criterion can be determined by means of iterative solutions. So the method is applied to rock-fill dams with nonlinear criterion, and the aseismatic ultimate capacity of dam can be determined.
Key words: hydraulic structure; earth rock dam; limit analysis; upper bound theorem; nonlinear failure criterion
发表期数: 2014年1月第2期
引用格式: 迟世春,杨昕光. 土石坝抗震极限能力有限元分析的上限法[J]. 中国科技论文在线精品论文,2014,7(2):186-190.
 
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