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工程科学与技术:2011,43(2):22-27
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考虑混凝土龄期及弹塑性徐变的大体积混凝土温度应力研究
(1.中国科学院 武汉岩土力学研究所,岩土力学与工程国家重点实验室,湖北 武汉 430071;2.三峡大学 水利与环境学院,湖北 宜昌 443002;3.中国科学院 武汉岩土力学研究所,岩土力学与工程国家重点实验室;4.三峡大学 水利与环境学院)
Study of Thermal Stress for Mass Concrete Considering Concrete Age and Elastic-plasticity Creep
(1.State Key Lab. of Geomechanics and Geotechnical Eng., Insti. of Rock and Soil Mechanics,Chinese Academy of Sci., Wuhan 430071, China;2.2 College of Hydraulic and Environmental Eng.,China Three Gorges Univ.,Yichang 443002,China;3.State Key Lab. of Geomechanics and Geotechnical Eng., Insti. of Rock and Soil Mechanics,Chinese Academy of Sci.;4.College of Hydraulic and Environmental Eng.,China Three Gorges Univ.)
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投稿时间:2010-04-15    修订日期:2010-08-12
中文摘要: 针对目前大体积混凝土工程上常用的混凝土徐变度是考虑了施加荷载时混凝土龄期的粘弹性模型,在较大的变温荷载作用下计算的温度应力往往过大,与实际不符。将常用的混凝土弹性徐变模型推广为弹塑性徐变模型,建议在弹性徐变模型的基础上串联一个混凝土强度参数及粘滞系数随龄期增长的Bingham元件来考虑混凝土的塑性流变,推导了弹塑性徐变温度应力仿真分析的隐式和显式算法公式,并研制了相关的程序。工程实例仿真分析表明,作者建议的考虑混凝土龄期的弹塑性徐变模型是可行的,其计算的温度应力较弹性徐变模型的计算值更符合实际。
中文关键词: 混凝土  弹性徐变  弹塑性徐变  龄期
Abstract:In view of the fact that the creep degree of concrete commonly used in mass concrete engineering is actually a visco-elastic model which considers concrete age under load,and it is inconsistent with the reality because the thermal stress calculated by visco-elastic model is bigger under big temperature load,the elastic creep formula was promoted to elasto-plastic creep formula.It was proposed that the plastic creep should be considered through linking a Bingham series whose strengthen parameter and viscosity factor increase as the concrete age increases on the basis of elastic creep model.An elastio-plastic creep formula with implicit and explicit arithmetics was deduced.and relative programs were developed based on this formula.The analysis of engineering examples showed that the elastio-plastic creep formula is feasible, and the values calculated by it are more reasonable than that of elastic creep one.
文章编号:201000377     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(90715028;51079079);湖北省教育厅科学技术研究项目(D20101207)
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黄耀英,郑宏,周宜红.考虑混凝土龄期及弹塑性徐变的大体积混凝土温度应力研究[J].工程科学与技术,2011,43(2):22-27.
Huanh Yaoying,Zheng Hong,Zhou Yihong.Study of Thermal Stress for Mass Concrete Considering Concrete Age and Elastic-plasticity Creep[J].Advanced Engineering Sciences,2011,43(2):22-27.