RC T-beams with flexural strengthening in the negative moment region under different configurations of NSM CFRP rods

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL Engineering Failure Analysis Pub Date : 2025-05-15 Epub Date: 2025-02-24 DOI:10.1016/j.engfailanal.2025.109458

Yanuar Haryanto , Nanang Gunawan Wariyatno , Fu-Pei Hsiao , Hsuan-Teh Hu , Ay Lie Han , Laurencius Nugroho , Hioe Hartono

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Abstract

This study employed a near-surface mounted (NSM) technique to enhance the flexural performance of reinforced concrete (RC) T-beams in the negative moment region, using carbon fiber reinforced polymer (CFRP) rods embedded at varying depths. An experimental investigation was conducted, supported by analytical calculations and finite element (FE) simulations, to validate the results. The experiments revealed that beams with half-embedded CFRP rods experienced partial debonding at significant crack locations, a problem potentially mitigated by fully embedded rods. Strengthening with NSM-CFRP rods increased cracking, yield, and ultimate loads by 10–21%, 36–38%, and 30–40%, respectively, compared to control beams, while also enhancing stiffness. However, these methods may have a twofold impact on the specimen by decreasing its ductility and energy absorption capacity. The analytical approach provided accurate and conservative predictions, with a coefficient of variation of 4.5%, while the FE model demonstrated high accuracy, achieving a coefficient of variation of 3.5% when compared to experimental flexural load capacity results.

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负弯矩区抗弯加固钢筋混凝土t梁在NSM碳纤维布杆的不同配置下

本研究采用近表面安装（NSM）技术，采用不同深度的碳纤维增强聚合物（CFRP）棒，在负弯矩区增强钢筋混凝土（RC） t梁的抗弯性能。在分析计算和有限元模拟的支持下，进行了实验研究，以验证结果。实验表明，半埋入CFRP棒的梁在重要的裂缝位置经历了部分剥离，这一问题可能会被完全埋入棒所缓解。与对照梁相比，使用NSM-CFRP棒进行加固的梁的开裂、屈服和极限荷载分别增加了10-21%、36-38%和30-40%，同时也增强了刚度。然而，这些方法可能会对试样产生双重影响，降低其延性和能量吸收能力。分析方法提供了准确和保守的预测，变异系数为4.5%，而有限元模型具有较高的准确性，与实验弯曲荷载结果相比，变异系数为3.5%。

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.