Externally bonded fiber-reinforced polymer (FRP) composites are commonly used to retrofit concrete beams in shear. However, debonding failure limits the effectiveness of such a system. Mechanically anchored systems eliminate the debonding mode of failure, which maximizes the effectiveness of the retrofit system. This study investigates the effectiveness of using a modified mechanical anchor to strengthen concrete T-beams in shear. The fabrication and design details of this system are discussed. Three reinforced concrete (RC) T-beams were tested up to failure under a four-point bending test to assess the effectiveness of the proposed retrofit system. One beam was tested as a control beam, while two beams were strengthened in shear using mechanically anchored dry carbon fiber (CF) sheets. The tested beams were instrumented with conventional instruments to monitor the load, strain, displacement, and acoustic sensors to monitor the damage initiation, progression, and location. The modified mechanical anchor retrofit system increased the shear capacity by up to 22 %. The acoustic emissions (AE) monitoring of the tested T-beams was able to detect the locations of the cracks that caused the failure of the beams.

外部粘合的纤维增强聚合物 (FRP) 复合材料通常用于改造混凝土梁的剪切。然而，脱粘失败限制了这种系统的有效性。机械固定系统消除了脱粘失效模式，从而最大限度地提高了改造系统的有效性。本研究调查了使用改进的机械锚栓在剪切中加强混凝土 T 梁的有效性。讨论了该系统的制造和设计细节。三根钢筋混凝土 (RC) T 型梁在四点弯曲试验下进行了直至失效的测试，以评估所提议的改造系统的有效性。一根梁作为控制梁进行测试，而两根梁使用机械锚固的干碳纤维 (CF) 板进行剪切加固。被测试的梁安装有传统仪器来监测载荷、应变、位移和声学传感器，以监测损伤的发生、进展和位置。改进后的机械锚改造系统将剪切能力提高了 22%。测试 T 型梁的声发射 (AE) 监测能够检测导致梁失效的裂纹位置。