Shear strengthening of reinforced concrete beams with laminate strips of CFRP

摘要

A conventional and three distinct CFRP-based shear reinforcing systems were used to assessthe most effective one on the shear strengthening of reinforced concrete beams. Nowadays, one of theseCFRP-based shear reinforcing systems is currently applied, wrapping the beam with strips of CFRP sheets.The two others CFRP-based shear reinforcing systems are based on bonding, with epoxy adhesive, laminatestrips of CFRP into slits cut on the concrete cover of the lateral surfaces of the concrete beams. These twoCFRP-based reinforcing systems only differ on the direction of the laminates. To evaluate the influence of thebeam height, two series of tests with beams of distinct height were carried. These last reinforcing systemswere more effective than the one based on strips of CFRP sheet, not only in terms of increasing the load bearingcapacity, but also enhancing the beam ductility. They are also much more simple and faster to apply. Inthe present work the tests carried out are described and the main results are presented and analyzed.