| 改进的非线性徐变模型及其在混凝土坝施工期温度应力仿真分析中的应用 |
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| 引用本文： | 刘杏红,周伟,常晓林,周创兵.改进的非线性徐变模型及其在混凝土坝施工期温度应力仿真分析中的应用[J].岩土力学,2009,30(2):440-446. |
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| 作者姓名： | 刘杏红 周伟 常晓林 周创兵 |
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| 作者单位： | 1. 武汉大学,土木建筑工程学院,武汉,430072
2. 武汉大学,水资源与水电工程科学国家重点实验室,武汉,430072 |
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| 摘 要： | 在目前的混凝土坝温度应力仿真计算分析中，一般采用弹性徐变模型考虑施工期混凝土徐变对温度应力的影响。当坝体内的温度应力比较小时，采用弹性徐变模型计算温度应力是可行的，但当坝体的温度应力超过相应龄期的抗拉强度一半时，混凝土的徐变变形不再与坝体的应力呈线性关系，而是呈现出剧烈的非线性变化趋势。温度应力与抗拉强度越接近，相应的非线性徐变变形越大。根据已有的混凝土徐变试验成果，提出了一个用于混凝土坝施工期温度应力仿真计算的混凝土非线性徐变模型，给出了相应的计算方法。算例表明，采用传统的弹性徐变模型与提出的非线性徐变模型计算的温度应力存在一定的差别，采用传统弹性徐变模型计算的温度应力偏大。
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| 关 键 词： | 混凝土坝 非线性徐变 温度应力 有限元 |
| 收稿时间： | 2007-05-17 |
An ameliorative nonlinear creep model and its application to thermal stress simulation during construction period |
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| LIU Xing-hong,ZHOU Wei,CHANG Xiao-lin,ZHOU Chuang-bing.An ameliorative nonlinear creep model and its application to thermal stress simulation during construction period[J].Rock and Soil Mechanics,2009,30(2):440-446. |
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| Authors: | LIU Xing-hong ZHOU Wei CHANG Xiao-lin ZHOU Chuang-bing |
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| Institution: | 1. School of Civil and Architectural Engineering, Wuhan University, Wuhan 430072, China; 2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China |
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| Abstract: | At present elastic creep model is often adopted to compute thermal stress of concrete dam. This method is feasible when thermal stress in dam is lower. But the creep deformation of concrete is no longer to be linear relation with thermal stress when thermal stress is larger than the half of concrete tensile strength; and the relation between the creep and the thermal stress shows a strong nonlinearity. Thermal stress is more close to concrete strength, the concrete creep deformation is more larger. A concrete nonlinear creep model is presented based on concrete creep test results and a corresponding algorithm is also presented. The computation results of an example and actual project show that the thermal stresses computed by elastic creep model and nonlinear creep model exist a little difference between them; and the thermal stress of the former is larger. |
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| Keywords: | concrete dam nonlinear creep thermal stress finite elements |
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