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首页> 外文期刊>Journal of Constructional Steel Research >Experimental investigation on steel-tube-confined-concrete stub column with different cross-section shapes under uniaxial- compression
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Experimental investigation on steel-tube-confined-concrete stub column with different cross-section shapes under uniaxial- compression

机译：单轴压缩条件下异形钢管混凝土短柱的试验研究

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摘要

An experimental investigation on steel tube confined concrete (STCC) stub columns with circular, square and octagonal cross-section shapes under monotonic axial compression was conducted. Different concrete grades were examined with measured compressive cylinder strengths ranging from 38 MPa to 112 MPa. The nominal yield strength of the steel tube was 355 MPa. The load capacity, load-axial shortening curves and axial-hoop strain behaviour of the STCC stub columns are compared to that of the counterparts, concrete filled steel tubes (CFST), with different cross-section shapes based on the same material and geometric properties. Comparisons indicated that the load capacity of STCC stub columns are very close to that in the CFST with circular and octagonal cross-sections, while the performance of square STCC is not as good as the CFST counterparts due to low effectiveness of confinement. According to the experimental results of lateral behaviours of STCC, CFST and plain concrete columns, it was concluded that with very high strength concrete (cylinder strength over 100 MPa), the axial performance of STCC stub columns is better than that in CFST. A design assessment was also conducted on STCC stub columns and shows that the current design formulae for load capacity of CFST are also applicable to that of STCC stub columns. (C) 2019 Elsevier Ltd. All rights reserved.
机译：进行了单调轴向压缩下圆形，方形和八边形钢管密实混凝土短柱的试验研究。检查了不同等级的混凝土，测得的抗压强度为38 MPa至112 MPa。钢管的标称屈服强度为355 MPa。根据相同的材料和几何特性，将STCC短柱的荷载能力，荷载轴向缩短曲线和轴向箍筋应变特性与具有不同横截面形状的钢管混凝土（CFST）进行了比较。 。比较表明，STCC短柱的承载能力非常接近具有圆形和八边形截面的CFST，而方形STCC的性能由于约束效率低而不如CFST。根据STCC，CFST和普通混凝土柱的侧向性能试验结果，可以得出结论：对于强度非常高的混凝土（筒体强度超过100 MPa），STCC短柱的轴向性能要优于CFST。还对STCC短管柱进行了设计评估，结果表明，目前CFST荷载能力的设计公式也适用于STCC短管柱。 （C）2019 Elsevier Ltd.保留所有权利。

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