CFRP加固梁的抗弯性能——与解析模型的比较

IF 3 Q2 ENGINEERING, CIVIL
P. Prabhakaran, G. Joseph
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引用次数: 4

摘要

摘要近年来,使用纤维增强聚合物(FRP)复合材料加固钢筋混凝土结构的方法在土木工程行业受到了广泛的关注和认可。近表面安装(NSM)钢筋和外部粘结钢筋(EBR)板已成为新的加固方法,其中外部钢筋(以钢筋或板的形式)嵌入凹槽或用环氧粘合剂粘附在截面上。本文提出了一种简化的分析方法来预测碳纤维增强聚合物(CFRP)加固的钢筋混凝土(RC)梁的弯曲性能。基于应变相容性和平衡原理,利用三线弯矩-曲率关系分析了FRP加固梁在三个临界点(i)裂纹萌生点(ii)钢屈服萌生点和极限承载力点)的抗弯承载力和变形性能。通过模拟NSM和EBR方法加固RC梁的试验程序中记录的力-挠度响应,评价了分析模型的良好预测性能。无论CFRP加固的布置如何,分析解也对文献中的实验结果给出了准确的预测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flexural performance of CFRP strengthened beams - comparison with analytical model
ABSTRACT In recent years, strengthening methods for reinforced concrete structures using fibre-reinforced polymer (FRP) composites have been gaining widespread interest and growing acceptance in civil engineering industry. Near surface mounted (NSM) reinforcement as well as externally bonded reinforcement (EBR) sheets have emerged as new strengthening methods in which external reinforcement (in the form of bars or sheets) is embedded into grooves or adhered to the section with epoxy adhesive. This paper proposes a simplified analytical approach to predict flexural behaviour of simply supported reinforced-concrete (RC) beams strengthened with carbon fibre-reinforced polymer (CFRP) using the above-mentioned methods. The flexural capacity and deformational behaviour of FRP strengthened beams are analysed using trilinear moment curvature relationship at three critical points namely (i) crack initiation point (ii) steel yield initiation point and (iii) ultimate capacity point, based on strain compatibility and principles of equilibrium. A good predictive performance of analytical model is appraised by simulating force-deflection response registered in the experimental program composed of RC beams strengthened with NSM as well as EBR methods. The analytical solutions have also given accurate prediction of experimental results in the literature regardless of the arrangement of CFRP reinforcement.
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来源期刊
CiteScore
3.90
自引率
9.50%
发文量
24
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