Fundamental insights into fracture characteristics and interfacial bond behavior of RC beams strengthened with CFRP

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-02-23 DOI:10.1016/j.istruc.2025.108531

Sihai Bao , Yafang Zhang , Juan Lu , Zhongxiang Guo , Libin Duan

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引用次数: 0

Abstract

This study aims to investigate fracture characteristics and interfacial bond behavior of CFRP strengthened beams. The strain distribution pattern, mechanical behavior and CFRP-concrete interfacial bond behavior of RC beam with various CFRP lengths were analyzed by using DIC. Moreover, based on interfacial bond shear stress-slip curves, the numerical model considering CFRP-concrete interfacial behavior was established. The failure process was described, and the average crack spacing of RC beams strengthened with various CFRP length was quantitatively characterized. The results indicated CFRP could alter the stress transfer mechanism and enhance the range of stress distribution. According to crack distribution characteristics, the modified maximum crack width equation for CFRP strengthened beam is proposed, and the applicability of modified model is validated. In addition, the numerical method that considers CFRP-concrete interfacial behavior can realistically simulate the processes of crack initiation, propagation, and penetration in CFRP strengthened beams. Noteworthy, linear functions are used to quantitatively analyze the variation pattern of accumulated AE energy with CFRP length.

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CFRP加固RC梁断裂特征和界面粘结行为的基本见解

本研究旨在研究CFRP加固梁的断裂特征及界面粘结行为。采用DIC分析了不同碳纤维布长度RC梁的应变分布规律、受力性能及碳纤维布-混凝土界面粘结性能。基于界面粘结剪应力-滑移曲线，建立了考虑cfrp -混凝土界面行为的数值模型。描述了破坏过程，定量表征了不同碳纤维布长度加固RC梁的平均裂缝间距。结果表明，碳纤维布可以改变应力传递机制，增大应力分布范围。根据裂缝分布特点，提出了CFRP加固梁最大裂缝宽度修正方程，并对修正模型的适用性进行了验证。此外，考虑CFRP-混凝土界面行为的数值方法可以真实地模拟CFRP加固梁的裂缝萌生、扩展和渗透过程。值得注意的是，利用线性函数定量分析了累积声发射能量随CFRP长度的变化规律。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.