Experimental investigation on axial compression behavior of heat-damaged concrete cylinders confined with CFRP sheets

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL Structures Pub Date : 2024-10-29 DOI:10.1016/j.istruc.2024.107560

Kang Zhao, Zhongjun Hu, Boxin Wang, Yuchuan Wen, Jingyi Han, Qiong Wu, Yan Xu

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Abstract

This study focuses on the axial compression behavior of heat-damaged concrete cylinders repaired with carbon fiber-reinforced polymer (CFRP) sheets. A total of 52 specimens were tested to investigate the effects of heating temperature, CFRP layers and cooling methods on the mechanical properties of heat-damaged concrete cylinders. The test results indicated that the residual compressive strength of heat-damaged concrete with water cooling is lower than that of heat-damaged concrete with natural cooling when the exposure temperature is ≥ 400 ℃. The confinement of CFRP can enhance the residual compressive strength of heat-damaged concrete. Considering the effect of the heating temperature and cooling method, a combination model was suggested to predict the ultimate strength of heat-damaged concrete confined by CFRP sheets, as well as the accuracy and applicability of the combination model were examined and demonstrated with test results and collected experimental data.

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用 CFRP 片材限制热损伤混凝土圆柱体轴向压缩行为的实验研究

本研究的重点是用碳纤维增强聚合物（CFRP）片修复的热损伤混凝土圆柱体的轴向压缩行为。共测试了 52 个试件，以研究加热温度、CFRP 层数和冷却方法对热损伤混凝土圆柱体力学性能的影响。试验结果表明，当暴露温度≥ 400 ℃时，水冷却热损伤混凝土的残余抗压强度低于自然冷却热损伤混凝土的残余抗压强度。CFRP 的约束作用可以提高热损伤混凝土的残余抗压强度。考虑到加热温度和冷却方式的影响，提出了一个组合模型来预测由 CFRP 片材约束的热损伤混凝土的极限强度，并通过试验结果和收集的实验数据检验和证明了该组合模型的准确性和适用性。

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来源期刊

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.