Dynamic shear responses of RC circular columns strengthened with recycled FRPs

IF 3.9 2区工程技术 Q1 ENGINEERING, CIVIL

Structures Pub Date : 2025-05-19 DOI:10.1016/j.istruc.2025.109234

Zhi-Wei Yan , Yanchen Song , Yu-Lei Bai , Kun Liu

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引用次数: 0

Abstract

Increasingly heavy urban traffic exacerbates vehicle impacts on reinforced concrete (RC) bridge columns, possibly leading to shear failure and structural collapse. To enhance the dynamic shear resistance of these columns, fiber reinforced polymers (FRPs) made from recycled polyethylene terephthalate (PET) plastic bottles were used for external strengthening. PET FRPs offer an eco-friendly alternative by repurposing plastic waste, reducing pollution, and promoting circular economy. This study focused on the dynamic shear responses of RC columns strengthened with PET FRPs. The influences of FRP types and number of FRP layers were experimentally revealed in terms of the failure modes, impact force, reaction force, shear force and impact force-displacement relationship. It was found that significant shear damage occurred in RC columns under horizontal impact loads, with carbon FRPs (CFRPs) strengthening unable to alter the failure mode. Nevertheless, the use of PET FRPs transformed the failure mode to a flexural-shear mode, significantly reducing the impact duration, maximum and residual displacements, and energy dissipation. Moreover, a finite element model was validated to describe the impact resistance of PET FRP-strengthened RC columns, as supported by experimental data. A parametric study further investigated the effects of impact velocity, impact mass, number of FRP layers, and reinforcement ratios on the dynamic shear responses. Based on the truss-arch model, a dynamic shear strength model was proposed and can well predict the dynamic shear capacity of FRP-strengthened RC circular columns.

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循环frp加固钢筋混凝土圆柱的动力剪切响应

日益繁忙的城市交通加剧了车辆对钢筋混凝土桥柱的冲击，可能导致结构剪切破坏和倒塌。为了提高这些柱的动态抗剪能力，使用回收的聚对苯二甲酸乙二醇酯（PET）塑料瓶制成的纤维增强聚合物（frp）进行外部强化。PET frp通过重新利用塑料废物、减少污染和促进循环经济，提供了一种环保的替代品。研究了PET frp加固RC柱的动力剪切响应。试验揭示了FRP材料种类和FRP层数对破坏模式、冲击力、反作用力、剪切力和冲击力-位移关系的影响。研究发现，水平冲击荷载作用下，钢筋混凝土柱发生了明显的剪切破坏，碳纤维复合材料（cfrp）加固不能改变破坏模式。然而，PET frp的使用将破坏模式转变为弯剪模式，显著减少了冲击持续时间、最大和剩余位移以及能量耗散。此外，通过实验验证了PET frp加固RC柱抗冲击性能的有限元模型。参数化研究进一步探讨了冲击速度、冲击质量、FRP层数和配筋率对动态剪切响应的影响。在桁架-拱模型的基础上，提出了一种动态抗剪强度模型，该模型能较好地预测frp加固RC圆柱的动态抗剪能力。

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.