ANCHORING OF EXTERNALLY BONDED CFRP REINFORCMENT

On using the externally bonded reinforcement for strengthening concrete structure elements, the significant affecting parameter that controls the obtained strengthening efficiency is the anchoring stress. This shear stress is generated at the end region of the longitudinal external reinforcement. Although there is a lot of information available on the behaviour of r.c. structure elements strengthened with externally bonded steel plates, little is known about their behaviour when carbon-fiber-reinforced-plastic (CFRP) laminates are used as a substitute for steel plates. So an experimental investigation was carried out on five r.c. beams and twenty four shear test specimens to study the effect of using this modern materials, CFRP laminates, as well as the different proposed techniques implemented at the end region of longitudinal CFRP laminates to alleviate or overcome the anchoring stress concentration generated at this region on the behaviour of strengthened beams. The paper also includes the discussion and evaluation of the modified formula suggested to predict the load carrying capacity of the beams strengthened with externally bonded CFRP laminates. The correspondence between experiments and predicted values is superior to the predictions by formulae available in literature up to now.

• INTRODUCTION

• EXPERIMENTAL PROGRAMME

• ANALYSIS AND DISCUSSION OF TEST RESULTS

• FRACTURE MECHANICAL APPROACH

• CONCLUSION AND RECOMMENDATION

• ACKNOWLEDGEMENT

• REFERENCES