The behavior of strengthened RC beams under pure torsion using NSM-CFRP rope

IF 2.1 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Building Pathology and Adaptation Pub Date : 2024-01-11 DOI:10.1108/ijbpa-02-2023-0024

Ahmed Ashteyat, A. Obaidat, Yasmeen Obeidat, Ahmad Bani Awwad

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引用次数: 0

Abstract

PurposeThe paper aims to introduces an experimental work to investigate the torsional behavior of reinforced concrete (RC) beams strengthened by near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) ropes.Design/methodology/approachIn this research, nine rectangular RC beams of 250 mm × 300 mm cross-section and 1,600 mm in length were constructed and tested considering the studied parameters. These parameters include the length of the CFRP rope, the orientation of the CFRP rope, the arrangement of longitudinal and the scheme of NSM-CFRP ropes.FindingsIn comparison to control specimens, the results demonstrate a considerable improvement in the torsional response of RC beams strengthened with the CFRP rope. Additionally, specimens strengthened with 90° vertical ropes increase torsional moment capacity more efficiently than specimens strengthened with 45° inclined ropes since the stress concentration leads to premature debonding of the CFRP rope. Whereas RC beams' ability to withstand torsional moments is reduced as the distance between reinforcing CFRP ropes is increased. According to test results, adding CFRP ropes to RC beams' bottoms had a slightly positive impact on torsional response.Originality/valueThis paper fulfills an identified need to study how the using of the CFRP rope is effective in strengthening RC beam subjected to torsion moment.

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使用 NSM-CFRP 绳在纯扭转下加固 RC 梁的行为

目的本文旨在介绍一项实验工作，研究通过近表面安装（NSM）碳纤维增强聚合物（CFRP）绳索加固的钢筋混凝土（RC）梁的扭转行为。设计/方法/方法在这项研究中，考虑到所研究的参数，建造并测试了九根横截面为 250 mm × 300 mm、长度为 1,600 mm 的矩形 RC 梁。这些参数包括 CFRP 绳的长度、CFRP 绳的方向、NSM-CFRP 绳的纵向排列和方案。研究结果与对照试样相比，结果表明使用 CFRP 绳加固的 RC 梁的扭转响应有了显著改善。此外，使用 90° 垂直绳索加固的试样比使用 45° 倾斜绳索加固的试样更有效地提高了抗扭能力，因为应力集中会导致 CFRP 绳索过早脱落。而随着 CFRP 加固绳之间距离的增加，RC 梁承受扭矩的能力也会降低。根据测试结果，在 RC 梁底部添加 CFRP 绳索对扭转响应有轻微的积极影响。

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

International Journal of Building Pathology and Adaptation CONSTRUCTION & BUILDING TECHNOLOGY-

CiteScore

4.80

自引率

18.20%

发文量

期刊介绍： The International Journal of Building Pathology and Adaptation publishes findings on contemporary and original research towards sustaining, maintaining and managing existing buildings. The journal provides an interdisciplinary approach to the study of buildings, their performance and adaptation in order to develop appropriate technical and management solutions. This requires an holistic understanding of the complex interactions between the materials, components, occupants, design and environment, demanding the application and development of methodologies for diagnosis, prognosis and treatment in this multidisciplinary area. With rapid technological developments, a changing climate and more extreme weather, coupled with developing societal demands, the challenges to the professions responsible are complex and varied; solutions need to be rigorously researched and tested to navigate the dynamic context in which today''s buildings are to be sustained. Within this context, the scope and coverage of the journal incorporates the following indicative topics: • Behavioural and human responses • Building defects and prognosis • Building adaptation and retrofit • Building conservation and restoration • Building Information Modelling (BIM) • Building and planning regulations and legislation • Building technology • Conflict avoidance, management and disputes resolution • Digital information and communication technologies • Education and training • Environmental performance • Energy management • Health, safety and welfare issues • Healthy enclosures • Innovations and innovative technologies • Law and practice of dilapidation • Maintenance and refurbishment • Materials testing • Policy formulation and development • Project management • Resilience • Structural considerations • Surveying methodologies and techniques • Sustainability and climate change • Valuation and financial investment