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钢管混凝土柱徐变稳定性分析

赵人达 吴德宝 王永宝 贾毅 廖平

赵人达, 吴德宝, 王永宝, 贾毅, 廖平. 钢管混凝土柱徐变稳定性分析[J]. 西南交通大学学报, 2019, 54(3): 468-474. doi: 10.3969/j.issn.0258-2724.20170371
引用本文: 赵人达, 吴德宝, 王永宝, 贾毅, 廖平. 钢管混凝土柱徐变稳定性分析[J]. 西南交通大学学报, 2019, 54(3): 468-474. doi: 10.3969/j.issn.0258-2724.20170371
ZHAO Renda, WU Debao, WANG Yongbao, JIA Yi, LIAO Ping. Creep Buckling Analysis of Concrete-Filled Steel Tubular Columns[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 468-474. doi: 10.3969/j.issn.0258-2724.20170371
Citation: ZHAO Renda, WU Debao, WANG Yongbao, JIA Yi, LIAO Ping. Creep Buckling Analysis of Concrete-Filled Steel Tubular Columns[J]. Journal of Southwest Jiaotong University, 2019, 54(3): 468-474. doi: 10.3969/j.issn.0258-2724.20170371

钢管混凝土柱徐变稳定性分析

doi: 10.3969/j.issn.0258-2724.20170371
基金项目: 国家重点研发计划资助项目(2016YFB1200401);国家自然科学基金资助项目(51778531);原铁道部科技研究开发计划课题(2010G018-A-1-04)
详细信息
    作者简介:

    赵人达(1961—),男,教授,研究方向为结构非线性分析及组合结构行为,E-mail:rendazhao@163.com

  • 中图分类号: U448.22

Creep Buckling Analysis of Concrete-Filled Steel Tubular Columns

  • 摘要: 为了探讨混凝土徐变对钢管混凝土柱轴向荷载作用下长期稳定性的影响,基于能量法和按照龄期调整的有效模量法,应用失稳准则,推导了考虑徐变和屈曲前变形的两端铰接、一端固定一端铰接和悬臂柱3种边界条件下的钢管混凝土柱长期稳定临界力计算公式,研究了该类柱徐变稳定临界力与核心混凝土强度的影响规律,并将规范取值与该临界力进行了对比. 研究结果表明:考虑徐变的钢管混凝土柱稳定临界力与徐变系数有关,相同计算长度但不同边界条件的该类柱徐变稳定临界力一致;核心混凝土强度的提高,会减小徐变对构件稳定临界力的影响;当按现行混凝土结构设计规范对核心混凝土强度等级低于C45的钢管混凝土柱进行设计时,应注意徐变失稳问题;钢管混凝土柱的徐变稳定承载力在前60 d下降明显且占总下降量约80%,在100 d后承载力逐渐趋于稳定.

     

  • 图 1  不同边界条件的受压构件失稳示意

    Figure 1.  Buckling modes of compression columns with three common boundary conditions

    图 2  管内混凝土强度与长期效应无量纲屈曲荷载关系

    Figure 2.  Relationship between dimensionless buckling load of long-term effects of creep and core concrete strength

    图 3  算例的临界力对比结果

    Figure 3.  Critical force comparison results of a numerical example

    图 4  无量纲徐变稳定临界力与时间曲线

    Figure 4.  Critical force time curve with different slenderness ratio

    表  1  混凝土等级与徐变系数终极值的关系表(CEB10模型)

    Table  1.   Relationship between concrete grade and the ultimate value of creep factor (CEB10 model)

    混凝土强
    度等级
    徐变系数
    终极值
    混凝土强
    度等级
    徐变系数
    终极值
    C154.145C551.603
    C203.525C601.512
    C253.085C701.362
    C302.775C801.243
    C352.325C901.147
    C402.133C1001.066
    C451.832C1100.998
    C50 1.708 C120 0.939
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-05-09
  • 修回日期:  2017-10-26
  • 网络出版日期:  2019-02-23
  • 刊出日期:  2019-06-01

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