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Experimental and numerical investigation on the deflection behavior of pre-cracked and repaired reinforced concrete beams with fiber-reinforced polymer

机译：具有纤维增强聚合物预裂纹和修复钢筋混凝土梁挠曲行为的实验性和数值研究

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This paper presents an experimental and numerical study on the effect of fiber-reinforced polymer (FRP) sheets/laminates on the flexural deflection of pre-cracked and repaired reinforced concrete (RC) beams. The experimental program was aimed at studying the carrying capacity of repaired beams through load-deflection curves along with failure modes which can occur in unrepaired and repaired RC beams. The types of FRP reinforcement (CFRP sheet, GFRP sheet and CFRP laminate) and the number of FRP layers were selected as two main parameters in the test program. The major code models, namely Eurocode 2, the ACI-318 and the BS-8110 are used for evaluation of ultimate moment, and the results are also compared with experiments ones. Finite element analysis (FEA) using ANSYS software is presented to predict the load-deflection behavior of the RC beams, and completed with a numerical analysis to assess the interfacial shear stresses, focusing on debonding failure. The experimental results show an improvement in the ultimate load capacity of repaired RC beams with FRP ranging from 13% to 100%, with lower midspan deflections ranging from 15% to 35% as compared to the control beam (without FRP). On the other hand, the major code models could not accurately predict the moment capacity of RC beams strengthened with FRP sheets/laminates, with a gap closer to 1.40. Moreover, the numerical FEA predictions show a good agreement in the load-deflection response for all tested beams. Also, the numerical analysis results indicate that the shear stresses rise with the number of FRP sheets layers. (C) 2020 Elsevier Ltd. All rights reserved.
机译：本文介绍了纤维增强聚合物（FRP）片材/层压物对预裂纹和修复钢筋混凝土（RC）梁弯曲挠度效果的实验和数值研究。实验计划旨在研究通过载荷偏转曲线以及在未料和修复的RC光束中发生的故障模式的修复梁的承载能力。 FRP加固（CFRP板，GFRP板和CFRP层压板）的类型和FRP层的数量被选为测试程序中的两个主要参数。主要代码模型，即欧洲码2，ACI-318和BS-8110用于评估最终时刻，结果也与实验相比。提出了使用ANSYS软件的有限元分析（FEA）以预测RC光束的负载偏转行为，并通过数值分析完成以评估界面剪切应力，专注于剥离失败。实验结果表明，与控制梁（无FRP）相比，RC射线的维修RC光束的最终负载能力的改善范围为13％至100％。另一方面，主要代码模型无法准确地预测RC光束加强的RC光束的力矩容量，间隙更接近1.40。此外，数值FEA预测显示了所有测试光束的负载偏转响应中的良好一致性。而且，数值分析结果表明剪切应力随FRP片材的数量升高。 （c）2020 elestvier有限公司保留所有权利。

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