Research on I steel reinforced concrete-filled GFRP tubular short columns
Research on I steel reinforced concrete-filled GFRP tubular short columns
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DOI：
10.1016/j.tws.2017.08.031
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发表时间：
2017-11
影响因子：
6.4
通讯作者：
W. Xie;Yu Chen;Shaohua Han;Wenbo Zhou;K. He
中科院分区：
文献类型：
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作者：
W. Xie;Yu Chen;Shaohua Han;Wenbo Zhou;K. He
对工字钢-玻璃纤维增强塑料(GFRP)钢管混凝土短柱进行了轴压试验研究。研究了配筋率、GFRP管厚度和混凝土强度三个参数对工字钢加固GFRP管混凝土短柱轴心受压性能的影响。共进行了27根工字钢骨GFRP管混凝土短柱试件的试验，其含钢率分别为4.6%、6.8%和8.3%，GFRP管厚度分别为5、8和10 mm，混凝土强度为20~40 Mpa。此外，本文还进行了纯工字形截面、纯GFRP管和不含工字形截面的全填充GFRP管的三个参考试验，并与所提出的组合截面进行了比较。文中给出了破坏模式、轴向荷载-应变关系、轴向荷载-轴向位移关系和极限荷载。为了更好地评价组合柱的截面性能，提出了强度指标。试验结果表明，所有试件的破坏模式基本相同。在相同轴向荷载作用下，在线性阶段，GFRP管的横向应变小于轴向应变。混凝土强度较高的试件具有较高的承载能力，但变形能力和强度指标较低。提高含钢率不能提高柱的承载能力和刚度，但可以减轻柱的重量。结果还表明，较厚的GFRP管既能提高承载能力，又能获得较好的变形能力，但存在成本效益低的问题。提出了工字型钢骨GFRP管混凝土短柱轴心受压承载力的设计公式。
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.