Study on eccentric compression performance of partially encased recycled concrete columns after high temperature

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL
Jiongfeng Liang , Xiang Luo , Caisen Wang , Wei Li
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Abstract

Waste concrete has caused significant environmental damage. With the increasing use of recycled concrete in construction, its mechanical properties and performance under high-temperature conditions have become critical concerns. In fire situations, the eccentric behavior of recycled concrete columns wrapped with H-shaped steel sections may be significantly impaired, leading to a notable reduction in load-carrying capacity and structural stability. To mitigate this issue and conserve natural resources, this study investigates the application of recycled coarse aggregate in partially encased concrete (PEC) columns. The effects of temperature (T), recycled coarse aggregate replacement ratio (R), and eccentricity ratio (e/h) on the eccentric compressive behavior of partially encased recycled concrete (PERC) columns after high temperatures were examined. Six PERC columns were designed for this study, along with one PEC column as a control specimen. The experimental results indicate that PERC columns exhibit different failure modes, all ultimately failing due to concrete crushing and flange buckling. Exposure to high temperatures resulted in a maximum mass loss of 4.63 % in the specimens. Among the three variables, the eccentricity ratio (e/h) had the most significant impact on the ultimate load capacity and ductility of the PERC columns. Specifically, when the e/h ratio increased from 0 to 0.2, the ultimate load capacity of the column decreased by 43.9 %, while its ductility increased by 26.2%. Based on these findings, a new formula for predicting the ultimate load of PERC columns after high temperature is proposed, providing an effective reference for post-fire PERC column analysis.
部分包覆再生混凝土柱高温后偏心受压性能研究
废旧混凝土对环境造成了严重破坏。随着再生混凝土在建筑中的应用越来越多,其在高温条件下的力学性能和性能成为人们关注的焦点。在火灾情况下,h型钢包覆再生混凝土柱的偏心行为可能会受到严重影响,导致其承载能力和结构稳定性显著降低。为了缓解这一问题并保护自然资源,本研究探讨了再生粗骨料在部分包裹混凝土(PEC)柱中的应用。研究了温度(T)、再生粗骨料替代率(R)和偏心比(e/h)对高温后部分包覆再生混凝土(PERC)柱偏心受压性能的影响。本研究设计了六个PERC柱,以及一个PEC柱作为对照标本。试验结果表明,PERC柱表现出不同的破坏模式,均因混凝土破碎和翼缘屈曲而最终破坏。高温下试样的最大质量损失为4.63 %。其中偏心比(e/h)对PERC柱极限承载能力和延性的影响最为显著。其中,当e/h比值从0增加到0.2时,柱的极限承载能力降低43.9% %,延性提高26.2%。在此基础上,提出了高温作用下PERC柱极限荷载的新预测公式,为火灾后PERC柱的分析提供了有效参考。
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来源期刊
Structures
Structures Engineering-Architecture
CiteScore
5.70
自引率
17.10%
发文量
1187
期刊介绍: Structures aims to publish internationally-leading research across the full breadth of structural engineering. Papers for Structures are particularly welcome in which high-quality research will benefit from wide readership of academics and practitioners such that not only high citation rates but also tangible industrial-related pathways to impact are achieved.
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