CFRP加固火灾后钢筋混凝土梁抗弯抗剪性能试验与分析研究

Q3 Engineering

Open Civil Engineering Journal Pub Date : 2023-07-01 DOI:10.28991/cej-2023-09-07-05

Vu Nguyen Nguyen, V. Cao

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引用次数: 0

摘要

本研究对碳纤维增强聚合物(CFRP)加固火灾后钢筋混凝土(RC)梁进行了试验研究，并进行了理论分析。对11根不同火灾持续时间的RC梁进行了试验，并对其进行了CFRP加固，对其进行了弯曲和剪切试验。试验结果表明，火灾将火灾后RC梁的弯曲破坏转变为弯剪破坏。CFRP加固后的RC梁经历了渐进的剥离破坏。与对照梁相比，FRP加固可显著提高屈服挠度58.2% ~ 97.3%，降低极限挠度43.0 ~ 55.5%。因此，延性降低69.7 - 74.7%，属于低延性。CFRP加固成功地使火灾后30分钟梁的强度比对照梁提高了23.1%。与对照梁相比，火灾显著降低了火灾后梁的刚度46.4% ~ 49.2%，而CFRP加固并没有完全恢复火灾后梁的刚度。最后，基于从实际火灾中获得的有限数据的实用性，建立了一个简单的无/有CFRP加固的火灾后梁的弯矩承载力模型。该模型具有简单、实用、精度合理等优点，可为结构工程师进行火灾后FRP加固提供参考。Doi: 10.28991/CEJ-2023-09-07-05全文:PDF

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Experimental and Analytical Study on Postfire Reinforced Concrete Beams Retrofitted with CFRP in Flexure and Shear

In this study, experiments were performed on carbon fiber reinforced polymer (CFRP) retrofitted postfire reinforced concrete (RC) beams, followed by theoretical analyzes. Experiments were conducted on eleven RC beams, which were exposed to different fire durations and retrofitted with CFRP in flexure and shear. The experimental results indicated that fire shifted the flexure failure to the flexure-shear failure of postfire RC beams. CFRP retrofitted postfire RC beams experienced progressive peeling-off failure. FRP retrofitting significantly increased the yield deflection by 58.2−97.3% but decreased the ultimate deflection by 43.0−55.5% compared with that of the control beam. Consequently, the ductility was reduced by 69.7−74.7%, categorized as low ductility. CFRP retrofitting successfully increased the strengths of 30-min postfire beams by up to 23.1% higher than those of the control beam. Fire significantly decreased the stiffness of postfire beams by 46.4−49.2% compared with that of the control beam, whereas CFRP retrofitting did not fully recover the stiffness of postfire beams. Finally, a simple model of the moment capacity of postfire beams without/with CFRP retrofits was developed based on the practicability of limited data feasibly obtained from real fires. The proposed model, with its simplicity, practicability, and reasonable accuracy, can be a useful tool for structural engineers in the FRP retrofitting of postfire RC structures. Doi: 10.28991/CEJ-2023-09-07-05 Full Text: PDF

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来源期刊

Open Civil Engineering Journal Engineering-Civil and Structural Engineering

CiteScore

1.90

自引率

0.00%

发文量

期刊介绍： The Open Civil Engineering Journal is an Open Access online journal which publishes research, reviews/mini-reviews, letter articles and guest edited single topic issues in all areas of civil engineering. The Open Civil Engineering Journal, a peer-reviewed journal, is an important and reliable source of current information on developments in civil engineering. The topics covered in the journal include (but not limited to) concrete structures, construction materials, structural mechanics, soil mechanics, foundation engineering, offshore geotechnics, water resources, hydraulics, horology, coastal engineering, river engineering, ocean modeling, fluid-solid-structure interactions, offshore engineering, marine structures, constructional management and other civil engineering relevant areas.