使用近表面安装的后张法碳纤维增强聚合物杆增强老化低强度预应力混凝土梁的抗弯能力

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Sanghyeon Cho, Wonseok Chung, Woo-tai Jung, Jong-sup Park, Heeyoung Lee
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引用次数: 0

摘要

本研究旨在通过研究使用近表面安装(NSM)后张碳纤维增强聚合物(CFRP)对老化的预应力混凝土(PSC)结构进行加固,从而解决预应力混凝土(PSC)结构的老化劣化这一关键问题。共制作了九根 PSC 梁,每根长度为 6.5 米,用于四点弯曲试验。实验中考虑了各种参数,包括加固方法、PSC 梁中混凝土的抗压强度以及 PSC 梁的预应力。结果表明,与 NSM 非后张 CFRP 加固系统相比,NSM 后张 CFRP 加固系统更为有效。与 PSC 参考梁相比,NSM 后张法 CFRP 加固系统在低强度劣化的 PSC 梁下的抗弯能力提高了 30.9%。此外,还将实验结果与有限元分析结果进行了比较,并对 PSC 梁的材料特性进行了参数研究。因此,NSM 后张法 CFRP 加固系统有望成为解决低强度 PSC 结构退化问题的有效解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhancing the Flexural Capacity of Deteriorated Low-Strength Prestressed Concrete Beam Using Near-Surface Mounted Post-Tensioned Carbon Fiber-Reinforced Polymer Bar

Enhancing the Flexural Capacity of Deteriorated Low-Strength Prestressed Concrete Beam Using Near-Surface Mounted Post-Tensioned Carbon Fiber-Reinforced Polymer Bar

This study aimed to address the critical issue of age deterioration in prestressed concrete (PSC) structures by investigating the strengthening of aged PSC structures using a near-surface mounted (NSM) post-tensioned carbon fiber-reinforced polymer (CFRP). A total of nine PSC beams, each with a length of 6.5 m, were fabricated for a four-point bending test. Various experimental parameters were taken into account, including the strengthening method, compressive strength of concrete in the PSC beam, and the prestressing force of the PSC beam. The results indicated that the NSM post-tensioned CFRP strengthening system proved more efficient when compared to the NSM non-post-tensioned CFRP strengthening system. The flexural capacity of the NSM post-tensioned CFRP strengthening system, under the deteriorated low-strength PSC beam, increased by up to 30.9% compared to the PSC reference beam. Additionally, the experimental results were compared to a finite-element analysis, and a parametric study was conducted to examine the material properties of the PSC beam. Consequently, the NSM post-tensioned CFRP strengthening system is expected to be an effective solution for addressing the issue of deteriorated low-strength PSC structures.

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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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