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Research on I steel reinforced concrete-filled GFRP tubular short columns

机译：Ⅰ型钢骨混凝土GFRP管式短柱的研究

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摘要

This paper presents an experimental investigation on I steel reinforced concrete-filled glass fiber reinforced plastic (GFRP) tubular short columns under axial load. The study aimed to explore the effect of three parameters of steel ratio, thickness of GFRP tube and concrete strength on the mechanical behavior of I steel reinforced concrete-filled GFRP tubular short columns under axial load. A total of twenty-seven I steel reinforced concrete filled GFRP tubular short column specimens were tested with steel ratio of 4.6%, 6.8% and 8.3%, thicknesses of GFRP tube of 5, 8 and 10 mm and concrete strengths from 20 to 40 MPa. What's more, three reference tests including the pure I-section, pure GFRP tube and fully filled GFRP tube without I-sections were conducted in this paper to compare with the proposed composite sections. The failure modes, axial load-strain relationships, axial load-axial displacement relationships and ultimate loads are presented in this paper. The strength index is proposed to better evaluate the section behavior of the composite columns. Experimental results show that the failure modes of all the specimens are basically the same. The transverse strain of GFRP tube is smaller than the axial strain under the same axial load in the linear stage. Specimens with higher concrete strength obtain higher load-bearing capacity but lower deformation capacity and strength index. Increasing steel ratio fails to improve the load-bearing capacity and stiffness, but can lighten the weight of the columns. The results also indicate that thicker GFRP tube can both improve the load-bearing capacity and obtain better deformation capacity but generate a problem of low cost-efficient. Design formulas for the load-bearing capacity of I steel reinforced concrete-filled GFRP tubular short columns under axial load are proposed.
机译：本文介绍了在轴向载荷下工字钢骨玻璃纤维增​​强塑料（GFRP）管状短柱的试验研究。本研究旨在探讨钢比例，玻璃纤维增​​强塑料管的厚度和混凝土强度这三个参数对I钢骨混凝土GFRP管状短柱在轴向载荷下的力学性能的影响。总共测试了27个I型钢填充的GFRP管状短柱试样，钢比例为4.6％，6.8％和8.3％，GFRP管的厚度为5、8和10 mm，混凝土强度为20至40 MPa 。此外，本文进行了三个参考测试，包括纯I形截面，纯GFRP管和不带I形截面的完全填充GFRP管，以与建议的复合截面进行比较。给出了破坏模式，轴向载荷-应变关系，轴向载荷-轴向位移关系以及极限载荷。提出强度指标以更好地评估复合材料柱的截面性能。实验结果表明，所有试样的破坏模式基本相同。在线性阶段，在相同轴向载荷下，GFRP管的横向应变小于轴向应变。具有较高混凝土强度的试样可获得较高的承载能力，但具有较低的变形能力和强度指标。增加钢的比例不能改善承载能力和刚度，但可以减轻柱子的重量。结果还表明，较厚的GFRP管既可以提高承载能力，又可以获得更好的变形能力，但会产生成本效益低的问题。提出了钢纤维混凝土GFRP钢管短柱在轴向载荷下的承载力设计公式。

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  • 来源
    《Thin-Walled Structures》 |2017年第11期|282-296|共15页
  • 作者

    Xie Wentao; Chen Yu; Han Shaohua; Zhou Wenbo; He Kang;

  • 作者单位

    Yangtze Univ, Sch Urban Construct, Jingzhou 434023, Peoples R China;

    Yangtze Univ, Sch Urban Construct, Jingzhou 434023, Peoples R China;

    Yangtze Univ, Sch Urban Construct, Jingzhou 434023, Peoples R China;

    Yangtze Univ, Sch Urban Construct, Jingzhou 434023, Peoples R China;

    Yangtze Univ, Sch Urban Construct, Jingzhou 434023, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    GFRP tube; Ultimate load; Concrete-filled columns; I steel; Steel ratio;

    机译：GFRP管;极限载荷;混凝土填充柱;I型钢;钢比;

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