混凝土断裂判据的研究及应用(正文).doc

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摘要：

本文综述了国内外专家学者在断裂力学方面近三十年来所取得的成果。通过学习混凝土断裂力学的根本原理以及应力强度因子K，断裂韧度等根本概念，再利用理论和经验断裂判据判断一些复合型裂缝〔本文主要是针对I-II型〕的稳定性问题。

最后利用断裂有限元原理并结合ANSYS软件分析重力坝在上游坝中和坝踵以及下游坝踵处出现的I-II型复合型裂缝，根据裂缝长度尺寸以及受力状态的不同〔分别的拉伸，拉剪，压剪〕得出相应的应力强度因子和，判断裂缝的稳定性，得出大坝的应变图，并将3次计算得出的结果进行比拟。

关键词：混凝土断裂力学应力强度因子断裂有限元

Abstract：

Inthispaper,

Keywords：

中英文摘要······························································································

第一章绪论·····················································································

引言··································································································

混凝土断裂力学的开展及应用························································

第三节本文的主要工作··············································································

第二章混凝土断裂破坏机理·········································································

第一节混凝土破坏现象的观测·················································································

第二节分析混凝土破坏机理的几个根本观点····························································

线弹性断裂力学的根本理论··························································

第一节应力函数和Griffith准那么··························································

第二节应力强度因子及断裂韧度······························································

线弹性断裂准那么············································································

第四节复合型断裂判据············································································

第四章断裂有限元方法计算应力强度因子················································

第一节断裂有限元计算应力强度因子计算原理····················································

第二节Ansys程序计算结构应力强度因子··············································

第五章混凝土断裂判据在工程实例中的应用··················································

第一节工程简介······································································································

第二节工程结构裂缝稳定性计算······························································

第六章总结和展望····································································

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