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| 混凝土拱坝线性开裂随机分析与非线性强度分析 |
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杨令强1,练继建1,张社荣1,陈祖坪2
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1. 天津大学,建筑工程学院,天津,300072
2. 首钢大学,北京,l00041
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| 摘要: |
| 将拱坝坝体与地基当作一个藉连的体系，建立三维线弹性与非线弹性力学模型，引入随机变量，对该模型进行随机分析。结合某双曲混凝土拱坝的算例，给出了拱坝开裂单元的位置和开裂顺序，指出单元进一步开裂的可能性很小，坝踵处4单元开裂后，将使坝体应力状态得到改善，故在坝踵部位设置底缝等工程措施十分必要。算例还表明，在对拱坝进行应力分析时，可用线弹性开裂分析的应力结果代替非线弹性的分析。 |
| 关键词: 线弹性 非线弹性 开裂 随机分析 应力 准则函数 可靠度指标 混凝土拱坝 |
| DOI： |
| 分类号:TV314 |
| 基金项目:国家自然科学基金资助项目 (5 97780 0 2 ) |
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| Linear cracking stochastic analysis and nonlinear intension analysis of concrete arch dams |
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YANG Ling qiang ,LIAN Ji jian ,ZHANG She rong ,CHEN Zu ping
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YANG Ling qiang 1,LIAN Ji jian 1,ZHANG She rong 1,CHEN Zu ping 2
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| Abstract: |
| A 3 dimension linear elastic model and a 3 dimension nonlinear elastic model of concrete arch dam are developed considering the dam and its foundation as an interactive system. Stochastic variables are introduced to analyze the models. A double curvature concrete arch dam is taken as an example, and the location and sequence of cracking elements are presented. It is pointed out that the other elements have less possibility to crack. After four elements crack at the dam heel, the stress state of the dam is thus improved, so it is necessary to take measures at dam heel such as bottom joint. Calculation results also show that linear elastic cracking analyses can replace nonlinear elastic analyses in stress analyses for an arch dam. |
| Key words: linear elastic,nonlinear elastic,crack,stochastic analysis,stress,criterion function,reliability index,concrete arch dam |
