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方中空不锈钢管混凝土短柱轴压承载力性能

唐红元 廖静 刘瑞忠 胡晓维

唐红元, 廖静, 刘瑞忠, 胡晓维. 方中空不锈钢管混凝土短柱轴压承载力性能[J]. 西南交通大学学报, 2023, 58(2): 421-429. doi: 10.3969/j.issn.0258-2724.20210388
引用本文: 唐红元, 廖静, 刘瑞忠, 胡晓维. 方中空不锈钢管混凝土短柱轴压承载力性能[J]. 西南交通大学学报, 2023, 58(2): 421-429. doi: 10.3969/j.issn.0258-2724.20210388
TANG Hongyuan, LIAO Jing, LIU Ruizhong, HU Xiaowei. Bearing Capacity of Concrete-Filled Double Skin Stub Columns with Square outer Stainless Steel tube Under Axial Compression[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 421-429. doi: 10.3969/j.issn.0258-2724.20210388
Citation: TANG Hongyuan, LIAO Jing, LIU Ruizhong, HU Xiaowei. Bearing Capacity of Concrete-Filled Double Skin Stub Columns with Square outer Stainless Steel tube Under Axial Compression[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 421-429. doi: 10.3969/j.issn.0258-2724.20210388

方中空不锈钢管混凝土短柱轴压承载力性能

doi: 10.3969/j.issn.0258-2724.20210388
基金项目: 教育部春晖计划合作项目(Z2016156)
详细信息
    作者简介:

    唐红元(1974—),男,教授,博士,研究方向为钢结构及组合结构,E-mail:tanghyseu@163.com

  • 中图分类号: TU398.9

Bearing Capacity of Concrete-Filled Double Skin Stub Columns with Square outer Stainless Steel tube Under Axial Compression

  • 摘要:

    为促进方中空不锈钢管混凝土构件在土木工程中的应用,以不锈钢外管厚度和混凝土强度为变量的6组试件为研究对象,首先,进行轴压试验,得到了不同试件在轴压荷载作用下的破坏模式、荷载-位移曲线、荷载-应变曲线,并进一步分析了不锈钢方管宽厚比、核心混凝土强度以及不锈钢方管约束效应系数对方中空不锈钢管混凝土短柱极限承载力的影响;然后,初步讨论了倒角对强度和延性的影响,提出了避免内管先于外管屈曲的最小厚度计算方法;最后,基于试验结果以及已有文献数据,采用拟合方法推导了方中空不锈钢管混凝土短柱的抗压承载力计算式,并与已有文献的简化模型及国外主要规范的计算结果进行对比. 研究结果表明:试件宽厚比由34.9降至20.9,极限承载力的提升率平均为98.5%,核心混凝土强度由C40提升至C60时,试件极限承载力的提升率平均为7.3%;短柱的轴压极限承载力随约束效应系数近似呈线性增加,约束效应系数$ \xi $越大,短柱的承载力越高;本文得到的计算式可以较好地预测方中空不锈钢管混凝土短柱的轴压承载力.

     

  • 图 1  试件加载系统和测点布置

    Figure 1.  Test setup and measuring point arrangement

    图 2  试件破坏形式

    Figure 2.  Failure modes of the specimens

    图 3  试件位移-荷载曲线

    Figure 3.  Load-displacement curves

    图 4  荷载-应变曲线

    Figure 4.  Load-strain curves

    图 5  约束效应系数对承载力的影响

    Figure 5.  Influence of constraint effect coefficient on bearing capacity

    图 6  混凝土强度与宽厚比对承载力的影响

    Figure 6.  Influence of concrete strength andwidth-thickness ratio on bearing capacity

    图 7  拟合曲线

    Figure 7.  Regression curve

    图 8  试验值与计算值比值统计

    Figure 8.  Statistics of the ratio of experimental value to calculated value

    表  1  试件参数

    Table  1.   Measured parameters of all specimens

    试件编号D/mmd/mmto/mmti/mmL/mmr/mmti.min/mmfsyi,min/MPa
    AS120-3-40119.657.23.433.41359.150.66185
    S120-4-40120.757.64.183.51358.420.90336
    S120-5-40121.257.95.813.62359.051.12497
    S120-3-60119.857.83.423.47359.250.66183
    BS120-4-60120.657.64.143.51359.020.90332
    S120-5-60120.657.85.803.59358.851.12499
    下载: 导出CSV

    表  2  金属材料性能

    Table  2.   Measured material properties

    类型名称σ0.2/MPaE/GPaf0.2,c/MPaμn
    不锈钢S120-33632035790.38
    S120-455020010100.34
    S120-55862049990.34
    碳钢ϕ57-34302200.3
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-05-12
  • 修回日期:  2021-10-18
  • 网络出版日期:  2023-01-07
  • 刊出日期:  2021-12-13

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