Flexural behavior of reinforced concrete beams strengthened with gradually prestressed near surface mounted carbon fiber-reinforced polymer strips under static and fatigue loading

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Advances in Structural Engineering Pub Date : 2024-04-08 DOI:10.1177/13694332241246374
Shuang Gong, Miao Su, Jianren Zhang, Hui Peng
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Abstract

The near surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) strengthening technique, combined with gradually anchored prestressed technique, is utilized to delay the occurrence of concrete cover separation (CCS) and enhance the ductility of reinforced concrete beams. The load-carrying capacity of fully prestressed beams and gradually prestressed beams are investigated under both static and fatigue loading conditions. The study focused on the effect of gradient prestress on flexural behavior of strengthened beams, analyzed the failure mode, characteristic load, ductility, and stress distribution at CFRP-concrete interface under both prestress and load conditions. Results indicate that gradually prestressed beams outperform fully prestressed ones in restraining crack development, delaying yield of tensile reinforcement, improving bearing capacity and avoiding CCS failure. Bearing capacity was significantly increased by up to 35.48%, while ductility was greatly improved by 100.33% with ultimate deflection for gradually prestressed beams compared to fully prestressed ones. The fatigue life of gradually prestressed beams, which experienced a transition from CCS failure mode to fatigue fracture of tensile reinforcement, was significantly extended. Additionally, their ductility at failure was also greatly enhanced, thus confirming the effectiveness of gradually prestressed NSM CFRP strengthening technique.
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静载和疲劳载荷下使用渐进预应力近表面安装碳纤维增强聚合物条加固的钢筋混凝土梁的挠曲行为
近表面安装(NSM)碳纤维增强聚合物(CFRP)加固技术与渐进锚固预应力技术相结合,可延缓混凝土覆盖层分离(CCS)的发生,提高钢筋混凝土梁的延性。研究了全预应力梁和渐进预应力梁在静载和疲劳载荷条件下的承载能力。研究重点是梯度预应力对加固梁抗弯行为的影响,分析了预应力和荷载条件下 CFRP-混凝土界面的破坏模式、特征荷载、延性和应力分布。结果表明,渐变预应力梁在抑制裂缝发展、延迟受拉钢筋屈服、提高承载能力和避免 CCS 失效方面优于全预应力梁。与全预应力梁相比,渐进预应力梁的承载能力大幅提高了 35.48%,而延性则大幅提高了 100.33%(极限挠度)。逐渐预应力梁的疲劳寿命从 CCS 失效模式过渡到受拉钢筋的疲劳断裂,从而大大延长。此外,其破坏时的延性也大大提高,从而证实了逐步预应力 NSM CFRP 加固技术的有效性。
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来源期刊
Advances in Structural Engineering
Advances in Structural Engineering 工程技术-工程:土木
CiteScore
5.00
自引率
11.50%
发文量
230
审稿时长
2.3 months
期刊介绍: Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.
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