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变温度环境下混凝土的三维收缩徐变效应

杨永清 李世伟 李晓斌 余取

杨永清, 李世伟, 李晓斌, 余取. 变温度环境下混凝土的三维收缩徐变效应[J]. 西南交通大学学报, 2019, 54(5): 931-936. doi: 10.3969/j.issn.0258-2724.20170256
引用本文: 杨永清, 李世伟, 李晓斌, 余取. 变温度环境下混凝土的三维收缩徐变效应[J]. 西南交通大学学报, 2019, 54(5): 931-936. doi: 10.3969/j.issn.0258-2724.20170256
YANG Yongqing, LI Shiwei, LI Xiaobin, YU Qu. 3D Shrinkage and Creep Effects of Concrete Under Varying Temperature Environment[J]. Journal of Southwest Jiaotong University, 2019, 54(5): 931-936. doi: 10.3969/j.issn.0258-2724.20170256
Citation: YANG Yongqing, LI Shiwei, LI Xiaobin, YU Qu. 3D Shrinkage and Creep Effects of Concrete Under Varying Temperature Environment[J]. Journal of Southwest Jiaotong University, 2019, 54(5): 931-936. doi: 10.3969/j.issn.0258-2724.20170256

变温度环境下混凝土的三维收缩徐变效应

doi: 10.3969/j.issn.0258-2724.20170256
基金项目: 铁道部科技研究开发计划重大课题资助项目(2008G031-K)
详细信息
    作者简介:

    杨永清(1965—),男,教授,博士,博士生导师,研究方向为大跨度桥梁结构行为、新建桥梁及既有桥梁结构评估,E-mail:yangyongqingx@163.com

  • 中图分类号: U448.218;TU311.41

3D Shrinkage and Creep Effects of Concrete Under Varying Temperature Environment

  • 摘要: 为准确分析混凝土的收缩徐变效应,基于收缩徐变的三维特性,对自然变温度环境下的混凝土收缩徐变效应进行了分析,建立了变温环境下混凝土三维收缩徐变效应的力学模型,并结合有限元分析软件ABAQUS开发了相应的计算程序,随后通过两个算例验证了方法的可行性与结果的可靠性. 研究结果表明:对于长期下挠和混凝土应变,模型计算值最大误差分别为8.2%和 –7.1%;模型能够很好地体现温度对徐变应变的影响,总体变化趋势与实测值较为一致,最大误差为 –20.5%,随着龄期增长误差越来越小,最终值误差为6.4%.

     

  • 图 1  收缩徐变效应计算程序流程

    Figure 1.  Shrinkage and creep effect computation program flow chart

    图 2  试验方案

    Figure 2.  Test setup

    图 3  试验环境温度变化曲线

    Figure 3.  Ambient temperature during the test

    图 4  有限元模型网格

    Figure 4.  Finite element mesh model

    图 5  跨中长期下挠计算曲线

    Figure 5.  Calculated long-term deflection curve of mid-span

    图 6  混凝土应变计算曲线

    Figure 6.  Calculated concrete strain curve

    图 7  徐变试验加载装置

    Figure 7.  Creep test apparatus

    图 8  试验环境温度变化曲线

    Figure 8.  Ambient temperature during the test

    图 9  有限元模型网格

    Figure 9.  Finite element mesh model

    图 10  混凝土徐变应变计算曲线

    Figure 10.  Calculated concrete creep-strain curve

    表  1  跨中长期下挠计算值比较

    Table  1.   Comparison of computed long-term deflection of mid-span

    时间/d实测值/mm文献[9]计算
    值/mm
    本文模型计算值/mm文献[9]与实测值误差/%本文模型与实测值误差/%文献[9]变异
    系数
    本文模型变
    异系数
    50 8.46 8.50 7.99 0.5 –5.6 0.9 1.7
    100 9.14 9.62 8.83 5.3 –3.4 1.4 2.7
    150 9.37 9.97 9.24 6.5 –1.4 2.1 3.4
    200 9.33 10.14 9.47 8.7 1.5 3.3 3.9
    250 9.30 10.28 9.63 10.5 3.5 4.7 4.1
    300 9.38 10.37 9.73 10.6 3.8 6.1 4.4
    350 9.60 10.43 9.81 8.7 2.3 8.0 4.7
    400 9.63 10.49 9.88 9.0 2.6 9.1 5.3
    450 9.56 10.48 9.93 9.6 3.9 9.5 5.1
    495 9.21 10.50 9.96 14.1 8.2 10.4 5.3
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出版历程
  • 收稿日期:  2017-04-06
  • 修回日期:  2017-10-18
  • 网络出版日期:  2019-06-18
  • 刊出日期:  2019-10-01

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