Abstract

This experimental study aims to investigate the effects of the strengthening arrangement on the behavior and the performance of strengthened beams, according to the Near-Surface Mounted (NSM) and the Externally Bonded Reinforcement (EBR) techniques. In total five rectangular beams including a Control Beam (CB) and four Carbon Fiber Reinforced Polymer (CFRP) strengthened beams with NSM and EBR techniques. The beams were tested to failure in Four-Point Bending (FPB) test. The experimental program comprises two beams strengthened by one and two strips according to the NSM technique. Two other beams were strengthened by the same configuration with the EBR, whereas the last beam was un-strengthened and considered as the CB. The responses of control and strengthened beams were compared. The efficiency and the effectiveness of different CFRP configurations were evaluated. The test results showed that the flexural load capacity, the deflection, the ductility and the stiffness of strengthened beams increased with increasing of plates distribution. This increase was more significant for the EBR technique than the NSM. This paper also highlights the beams failure modes due to the different configurations of strengthening. The obtained results revealed that the crack patterns were affected by the arrangement of the strips.

摘要

本实验研究旨在根据近表面安装 (NSM) 和外部粘合钢筋 (EBR) 技术研究加固布置对加固梁的行为和性能的影响。总共有五个矩形梁，包括一个控制梁 (CB) 和四个采用 NSM 和 EBR 技术的碳纤维增强聚合物 (CFRP) 加强梁。在四点弯曲 (FPB) 测试中对梁进行了失效测试。实验程序包括根据 NSM 技术由一个和两个条带加强的两个梁。另外两根梁采用与 EBR 相同的配置进行加固，而最后一根梁未加固并被视为 CB。比较了控制梁和加强梁的响应。评估了不同 CFRP 配置的效率和有效性。试验结果表明，加强梁的抗弯承载力、挠度、延性和刚度随着板分布的增加而增加。这种增加对于 EBR 技术比 NSM 更显着。本文还强调了由于不同的加固配置导致的梁失效模式。所得结果表明，裂纹图案受条带排列的影响。本文还强调了由于不同的加固配置导致的梁失效模式。所得结果表明，裂纹图案受条带排列的影响。本文还强调了由于不同的加固配置导致的梁失效模式。所得结果表明，裂纹图案受条带排列的影响。