Mechanical behavior of CFRP grid-reinforced shear walls enhanced with ECC: An experimental and theoretical investigation

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-05-27 DOI:10.1016/j.istruc.2025.109239

Zhen Huang , Bin Lin , Jie Shen , Lei Feng , Xiaorui Xie

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引用次数: 0

Abstract

Premature concrete spalling at the base of shear walls reinforced with carbon fiber-reinforced polymer (CFRP) grids often limits the full utilization of the high-strength properties of CFRP, compromising structural performance. To overcome this limitation, engineered cementitious composites (ECC) were introduced into the plastic hinge regions in this study, aiming to effectively leverage the mechanical advantages of CFRP grids and enhance the shear capacity and ductility of shear walls. Six shear wall specimens were designed, fabricated, and tested under cyclic loading: one conventional reinforced concrete (RC) shear wall, one CFRP grid-reinforced wall, and four shear walls reinforced with CFRP grids and incorporating ECC in the plastic hinge zones. The failure modes, hysteresis and skeleton curves, energy dissipation capacity, stiffness degradation, and reinforcement strain were investigated. Experimental results showed that ECC-enhanced specimens exhibited significantly improved ductility, crack resistance and energy dissipation compared to specimens without ECC, along with reduced crack propagation angles and reduced stiffness degradation. To accurately predict the shear behavior of these enhanced shear walls, an improved Modified Compression Field Theory (MCFT) was developed by integrating the effects of CFRP grids and the fibers in ECC. Finally, a novel algorithm based on this enhanced MCFT was formulated to calculate the shear capacity of the shear walls, with theoretical predictions closely matching the experimental results.

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ECC加固CFRP格栅剪力墙的力学性能：试验与理论研究

碳纤维增强聚合物（CFRP）网格加固剪力墙底部的混凝土过早剥落往往限制了CFRP高强度特性的充分利用，影响了结构性能。为了克服这一限制，本研究将工程胶凝复合材料（ECC）引入塑性铰区域，旨在有效利用CFRP网格的力学优势，提高剪力墙的抗剪能力和延性。在循环荷载作用下，设计、制作和测试了6个剪力墙试件：1个常规钢筋混凝土剪力墙，1个碳纤维布网格加筋剪力墙，以及4个碳纤维布网格加筋并在塑性铰区加入ECC的剪力墙。研究了结构的破坏模式、滞回曲线和骨架曲线、耗能能力、刚度退化和钢筋应变。实验结果表明，ECC增强后的试件的延性、抗裂性和能量耗散显著改善，裂纹扩展角减小，刚度退化程度降低。为了准确预测这些增强剪力墙的剪切性能，通过综合CFRP网格和ECC中纤维的影响，建立了改进的修正压缩场理论（MCFT）。最后，提出了一种基于增强MCFT的剪力墙抗剪承载力计算算法，理论预测与实验结果吻合较好。

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.