Flexural strengthening of reinforced concrete beams with different levels of damage using ambient-cured ultra-high performance concrete

IF 2.6 3区 工程技术 Q2 ENGINEERING, CIVIL
Chen Wu, Xiaofei Xiao, Shenglan Ma, Kedan Chen, Guoliang Lin
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Abstract

AbstractThis paper proposes an ambient-cured ultra-high performance concrete (ACUHPC) by optimising its mixing procedure based on general materials. Seven reinforced concrete (RC) beams were designed and subjected to different levels of damage and strengthened using the proposed ACUHPC. Flexural experiments were performed, and corresponding finite element (FE) models were developed to investigate the flexural performance of the strengthened beams. The influence of the level of damage and thickness of the ACUHPC strengthening layer on the response of the beams was evaluated. The scope of application of the proposed ACUHPC strengthening method, suggestions for its implementation, and methods for estimating the flexural capacity and mid-span deflection of the strengthened beams are presented herein. The results indicated that using the ACUHPC can significantly increase the flexural capacity and effectively decrease the deflections and maximum crack width of the strengthened beams. Furthermore, the flexural capacity of the most severely damaged beam was enhanced by 36.3% after strengthening.Keywords: Ambient-cured ultra-high performance concretedamaged beamsdeflectionsflexural behaviourreinforced concrete beamsstrengthening Disclosure statementThe authors declare that there is no any competing interest for this study.Additional informationFundingAuthors acknowledge the financial support provided by the Industry-university Cooperation Project of Fujian Province, China (Grant No. 2022H6032); the Natural Science Foundation of Fujian Province, China (Grant No. 2020J05184); and National Natural Science Foundation of China (Grant No. 52378494).
采用环境固化超高性能混凝土对不同损伤程度的钢筋混凝土梁进行抗弯加固
摘要本文提出了一种环境固化超高性能混凝土(ACUHPC),在普通材料的基础上,对其搅拌工艺进行了优化。设计了7根钢筋混凝土(RC)梁,并使用拟议的ACUHPC进行了不同程度的损伤和加固。进行了抗弯试验,建立了相应的有限元模型,对加固梁的抗弯性能进行了研究。评估了损伤程度和ACUHPC加固层厚度对梁响应的影响。提出了ACUHPC加固方法的适用范围、实施建议以及加固梁的抗弯承载力和跨中挠度估算方法。结果表明:采用ACUHPC可以显著提高加固梁的抗弯承载力,有效降低加固梁的挠度和最大裂缝宽度;损伤最严重的梁经加固后抗弯承载力提高了36.3%。关键词:环境固化超高性能混凝土损伤梁挠曲性能钢筋混凝土梁加固披露声明作者声明本研究没有任何竞争利益。作者感谢福建省产学研合作项目(批准号2022H6032)提供的资金支持;福建省自然科学基金(资助号2020J05184);国家自然科学基金项目(52378494)。
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来源期刊
Structure and Infrastructure Engineering
Structure and Infrastructure Engineering 工程技术-工程:机械
CiteScore
9.50
自引率
8.10%
发文量
131
审稿时长
5.3 months
期刊介绍: Structure and Infrastructure Engineering - Maintenance, Management, Life-Cycle Design and Performance is an international Journal dedicated to recent advances in maintenance, management and life-cycle performance of a wide range of infrastructures, such as: buildings, bridges, dams, railways, underground constructions, offshore platforms, pipelines, naval vessels, ocean structures, nuclear power plants, airplanes and other types of structures including aerospace and automotive structures. The Journal presents research and developments on the most advanced technologies for analyzing, predicting and optimizing infrastructure performance. The main gaps to be filled are those between researchers and practitioners in maintenance, management and life-cycle performance of infrastructure systems, and those between professionals working on different types of infrastructures. To this end, the journal will provide a forum for a broad blend of scientific, technical and practical papers. The journal is endorsed by the International Association for Life-Cycle Civil Engineering ( IALCCE) and the International Association for Bridge Maintenance and Safety ( IABMAS).
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