郭为强, 魏亚. 基于微预应力-固结理论的早龄期混凝土高温拉伸徐变试验与模拟[J]. 工程力学, 2017, 34(3): 197-203. DOI: 10.6052/j.issn.1000-4750.2015.08.0658
引用本文: 郭为强, 魏亚. 基于微预应力-固结理论的早龄期混凝土高温拉伸徐变试验与模拟[J]. 工程力学, 2017, 34(3): 197-203. DOI: 10.6052/j.issn.1000-4750.2015.08.0658
GUO Wei-qiang, WEI Ya. MICROPRESTRESS SOLIDIFICATION THEORY-BASED EXPERIMENTAL AND MODELING OF EARLY-AGE CONCRETE TENSILE CREEP AT ELEVATED TEMPERATURES[J]. Engineering Mechanics, 2017, 34(3): 197-203. DOI: 10.6052/j.issn.1000-4750.2015.08.0658
Citation: GUO Wei-qiang, WEI Ya. MICROPRESTRESS SOLIDIFICATION THEORY-BASED EXPERIMENTAL AND MODELING OF EARLY-AGE CONCRETE TENSILE CREEP AT ELEVATED TEMPERATURES[J]. Engineering Mechanics, 2017, 34(3): 197-203. DOI: 10.6052/j.issn.1000-4750.2015.08.0658

基于微预应力-固结理论的早龄期混凝土高温拉伸徐变试验与模拟

MICROPRESTRESS SOLIDIFICATION THEORY-BASED EXPERIMENTAL AND MODELING OF EARLY-AGE CONCRETE TENSILE CREEP AT ELEVATED TEMPERATURES

  • 摘要: 研究了早龄期混凝土高温拉伸徐变特性,建立起能够考虑混凝土内部水化热和外界环境温度影响,并且适用于早龄期混凝土拉伸徐变的数值计算方法。采用自行设计的门式徐变加载设备和环境箱控制系统,进行了室温(23℃)和高温(43℃)环境下的混凝土拉伸徐变试验,加载龄期分别为1 d、7 d和28 d。利用徐变试验结果确定模型的计算参数,进而模拟、验证温度因素对于混凝土拉伸徐变的影响。研究结果表明,早龄期混凝土的拉伸徐变对混凝土的加载龄期和温度变化非常敏感,基于微预应力-固结理论建立起考虑温度效应和早龄期特征的数值模型,可以较好地描述不同温度历史下的早龄期混凝土拉伸徐变特征。模型采用应力-应变增量关系进行数值计算,能够为通用有限元软件徐变分析的二次开发提供基础。

     

    Abstract: This paper investigates nsile creep behavior of early-age concrete at normal and elevated temperature numerically and experimentally. The tensile creep is measured under the temperature of 23oC and 43oC and the specimens are loaded at the ages of 1, 7, and 28 days. A numerical model is established to account for the temperature effect from cement hydration and the environment. The results show that the tensile creep of early-age concrete is very sensitive to temperature rise and loading ages. The established microprestress solidification theory-based numerical model predicts tensile creep of early-age concrete at elevated temperature very well, and it can be used for commercial finite element analysis.

     

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