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桁架增强十字形钢管混凝土柱的偏心受压性能

Eccentric Compression Behavior of Truss-Reinforced Cross-Shaped Concrete-Filled Steel Tubular Columns.

作者信息

Tao Yu, Zhang Sumei, Xiong Gaopeng, Gong Chao, Hou Zhaoxin, Li Xiaozhong

机构信息

School of Civil and Environmental Engineering, Harbin Institute of Technology, University Town, Shenzhen 518055, China.

Guangdong Provincial Key Laboratory of Intelligent and Resilient Structures for Civil Engineering, Harbin Institute of Technology, Shenzhen 518055, China.

出版信息

Materials (Basel). 2024 Jul 28;17(15):3738. doi: 10.3390/ma17153738.

DOI:10.3390/ma17153738
PMID:39124402
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11313521/
Abstract

In the paper, the eccentric compression behavior of the truss-reinforced cross-shaped concrete-filled steel tubular (CCFST) column is investigated. A total of eighteen CCFST columns were tested under eccentric compression, and the key test variables included the reinforced truss node spacing ( = 140 mm and 200 mm), slenderness ratio ( = 9.2, 16.6, and 23.1), and eccentricity ratio ( = 0, 0.08, and 0.15). The failure mode, deformation characteristic, stress distribution, strain distribution at the mid-span of the steel tube, and the eccentric compression bearing capacity were assessed. The results show that due to the addition of reinforced truss, the steel plates near the mid-span of eccentrically compressed CCFST columns experienced multi-wave buckling rather than single-wave buckling after the peak load was reduced to 85%, and the failure mode of concrete also changed from single-section to multi-section collapse failure. Comparisons were made with the unstiffened specimen. The ductility coefficient of the stiffened specimen with eccentricity ratios of 0.08-0.15 and node spacings of 140 mm200 mm increased by 7083%, approaching that of the multi-cell specimens with an increasing steel ratio of 1.8%. In addition, by comparing the test results with the calculation results of four domestic and international design codes, it was found that the Chinese codes CECS159-2018 and GB50936-2014, and the Eurocode 4 (2004) can be better employed to predict the compression bearing capacity of truss-reinforced CCFST columns.

摘要

本文研究了桁架增强十字形钢管混凝土（CCFST）柱的偏心受压性能。共对18根CCFST柱进行了偏心受压试验，关键试验变量包括桁架加强节点间距（=140mm和200mm）、长细比（=9.2、16.6和23.1）以及偏心率（=0、0.08和0.15）。评估了破坏模式、变形特性、应力分布、钢管跨中应变分布以及偏心受压承载力。结果表明，由于添加了加强桁架，偏心受压CCFST柱跨中附近的钢板在峰值荷载降至85%后经历了多波屈曲而非单波屈曲，混凝土的破坏模式也从单截面破坏转变为多截面破坏。与未加劲试件进行了对比。偏心率为0.08 - 0.15且节点间距为140mm200mm的加劲试件的延性系数提高了70%83%，接近含钢率增加1.8%的多格构试件的延性系数。此外，通过将试验结果与四个国内外设计规范的计算结果进行比较，发现中国规范CECS159 - 2018和GB50936 - 2014以及欧洲规范4（2004）能更好地用于预测桁架增强CCFST柱的受压承载力。

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本文引用的文献

1
Axial Compressive Behavior of Cross-Shaped CFST Stub Columns with Steel Bar Truss Stiffening.带钢筋桁架加劲的十字形钢管混凝土短柱的轴压性能
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