| 马震岳,何鹏程,张运良,张宏战.水电站充水保压蜗壳结构非线性仿真分析[J].,2010,(6):1014-1019 |
| 水电站充水保压蜗壳结构非线性仿真分析 |
| Nonlinear simulation analysis for preloading spiral case of keeping constant internal water pressure of hydropower station |
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| DOI：10.7511/dllgxb201006031 |
| 中文关键词: 水电站蜗壳 仿真分析 非线性有限元 ABAQUS |
| 英文关键词: spiral case of hydropower station simulated analysis nonlinear FE ABAQUS |
| 基金项目:辽宁省教育厅重点实验室科研基金资助项目(2008S045). |
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| 摘要点击次数: 1025 |
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| 中文摘要: |
| 以ABAQUS有限元软件为平台，考虑水电站蜗壳充水保压浇筑外围混凝土、卸载形成间隙和再充水运行的全过程，建立仿真计算模型，研究保压蜗壳钢衬和外围混凝土部分联合承载的机理和混凝土结构损伤发生发展的规律．以某大型水电站充水保压蜗壳结构为实例，进行了三维非线性仿真分析，并与传统简化模型的计算结果进行比较，通过两模型间主要差异存在原因的探讨，得出了钢衬与混凝土间间隙不均匀性和间隙过早闭合是混凝土结构受力偏大和损伤程度发展的不利因素的结论．研究认为，仿真模型能够更真实地模拟保压蜗壳结构的受力与工作状态，可以为蜗壳结构优化设计和钢筋有效配置提供更为可靠的分析方法． |
| 英文摘要: |
| Based on the FE software — ABAQUS, a simulation model was established to research into the construction and running process of the preloading spiral case keeping constant internal water pressure of hydropower station. The model firstly takes into account the surrounding concrete constructing keeping a preloading internal water pressure with constant value, then the removing of the preloading load and initial gap established, and finally the re-filling of water with normal operation. The load-bearing properties both by spiral case steel liner and the surrounding concrete and the concrete damage developing process were studied mainly. Taking a large preloading spiral case as a real model, 3D-nonliner simulation was carried out, and the experimental results were compared with those of the traditional simplification model. Through the analysis of the main differences between two models and discussion of the developing and closing process of the gap between steel liner and the outer concrete structure, it is concluded that the non-uniform distribution and too-earlier closing of the gap are the main reasons of the higher stress level of the concrete and the damage developing. The simulation model could represent more practically the bearing characteristics and the operation properties of the preloading spiral case, and could be taken as a reliable simulation method for the structure design of the spiral case and rebar′s playing. |
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