Experimental Investigation on Axial Strength Improvement of Cold-Formed Steel Jacketed Concrete Stub Columns

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Apisith Waenpracha, Tanyada Pannachet, Maetee Boonpichetvong
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Abstract

This paper presents an experimental study on the behavior of low-strength concrete columns confined with cold-formed steel under axial compression. The laboratory test specimens consist of four groups of rectangular concrete stub columns in the size of 130 \(\times \) 200 mm cross section and 300 mm height; the first group composes of the unconfined specimens, while the other three contain the confined specimens under 0%, 25% and 50% sustained axial loads. The jackets are made of two G450-grade channel cold-formed steel sections of 2.4 mm thickness welded together. No bonding material is used between the core concrete and the steel jacket. From the results, it is found that the cold-formed steel jacketing can increase the axial strengths of the unconfined concrete specimens by approximately 40-65%. The strength increase comes mainly from the confinement action, as only small axial deformation is detected in the jacket. Based on the given amount of prescribed preloads in this study, the presence of preload in the column does not have a significant effect on the increase in strength of the confined concrete columns. The measured strength enhancement ratio and the confinement ratio of the tested specimens are compared using five existing strength predictive equations. The performance of the unbonded cold-formed steel jacketing technique adopted in the stub columns is observed to closely conform with the predictive confinement model of the concrete-filled tubes.

Abstract Image

提高冷弯钢套钢混凝土支柱轴向强度的实验研究
本文介绍了冷弯型钢约束的低强度混凝土柱在轴向压缩下的行为实验研究。实验室试件由四组矩形混凝土桩柱组成,截面尺寸为 130 \(\times \) 200 mm,高度为 300 mm;第一组为非约束试件,其他三组为约束试件,分别承受 0%、25% 和 50%的持续轴向荷载。夹套由两个厚度为 2.4 毫米的 G450 级槽钢冷弯型钢焊接而成。核心混凝土和钢套之间没有使用粘结材料。研究结果表明,冷弯型钢护套可将非约束混凝土试件的轴向强度提高约 40-65%。强度的提高主要来自于约束作用,因为在钢套中只检测到很小的轴向变形。根据本研究中给定的预紧力,柱中预紧力的存在对约束混凝土柱强度的提高没有显著影响。利用现有的五个强度预测方程,对测试试件的强度增强率和约束率进行了比较。据观察,桩柱中采用的无粘结冷弯型钢护筒技术的性能与混凝土填充管的预测约束模型非常吻合。
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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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