Strengthening of reinforced concrete beams in shear with fiber reinforced cementitious matrix

摘要

The development of cement-based composites has been fruitful in the recent years. It is important to examine the new materials and technologies so they can fulfill repairing and strengthening applications in the structural engineering fields. An experimental study on the behavior of reinforced concrete beams strengthened in shear using an externally applied fiber reinforced cementitious matrix (FRCM) is presented. The PBO-FRCM system consists of two components: the reinforcing mesh is Polyparaphenylene benzobisoxazole – PBO fiber composite and the bonding agent is cementitious matrix. The test variables included two different configurations of U-wrapped systems and the PBO reinforcement’s ratio. The aims of this study were to investigate the effectiveness and the shear performance of the PBO-FRCM system for strengthening reinforced concrete beams in shear. All the beams were instrumented and tested under four-points loading. The test results included the observed shear contribution of the PBO-FRCM system and the failure mode of the strengthened beams.