Flexural performance of steel-concrete composite beams strengthened with a CFRP grid-ECC layer at the hogging moment region

IF 4.3 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-09-09 DOI:10.1016/j.istruc.2025.110160

Jing Li , Xiaoyang Liu , Chenghua Peng , Weikang Gong , Guotao Yang , Jian-Guo Dai

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引用次数: 0

Abstract

The combination of carbon fibre reinforced polymer (CFRP) grid with engineered cementitious composite (ECC) provides a promising solution for structural strengthening. This paper presents an investigation into the application of the CFRP grid-ECC method for strengthening steel-concrete composite beams at the hogging moment region. Four composite beams are fabricated and tested to investigate the effects of the ECC thickness and the number of CFRP grids on their flexural responses, in terms of failure mode, load-carrying capacity, load-deflection, load-slip behaviour, and ductility. The obtained results demonstrate that the ECC layer provides effective bonding between the CFRP grid and the concrete substrate, and this strengthening technique effectively enhances the hogging moment capacity of the composite beams, achieving improvements of 11.3 % in yield load and 10.1 % in peak load. Additionally, a finite element (FE) model is developed for the strengthened composite beams to further investigate the effects of ECC thickness, rebar strength, reinforcement ratio, number of CFRP grids, steel beam strength, as well as the thicknesses of the top and bottom flanges on the hogging moment capacity. Furthermore, an analytical formula is developed for evaluating the hogging moment capacity of the strengthened composite beams, and the results exhibit reasonable agreement with the test results.

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CFRP格栅- ecc层加固钢-混凝土组合梁在弯矩区抗弯性能

碳纤维增强聚合物（CFRP）网格与工程胶凝复合材料（ECC）的结合为结构加固提供了一种很有前途的解决方案。本文研究了CFRP格栅- ecc法在钢-混凝土组合梁拱弯矩区加固中的应用。制作并测试了四个组合梁，以研究ECC厚度和CFRP网格数量对其弯曲响应的影响，包括破坏模式、承载能力、负载挠度、负载滑移行为和延性。结果表明，ECC层在CFRP格栅与混凝土基板之间提供了有效的粘结，这种加固技术有效地提高了组合梁的弯矩承载力，使屈服荷载和峰值荷载分别提高了11. %和10. %。此外，建立了加固组合梁的有限元模型，进一步研究了ECC厚度、钢筋强度、配筋率、碳纤维布网格数量、钢梁强度以及上下翼缘厚度对占用弯矩能力的影响。建立了加固组合梁的弯矩承载力分析公式，计算结果与试验结果吻合较好。

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.