Experimental Study On Shear Performance Of RC Beam Reinforced With Near Surface Mounted CFRP Strips

Because of aging of the structures,upgrading essential infrastructure and accidental damages , the studies on strengthening and retrofitting structures were more and more concerned by countries of the world. In virtue of the advantages of fiber-reinforced plastic/polymer (FRP), light-weight, high-strength, nice environmental and fatigue resistibility, it has been broadly used in structural strengthening . Recently, a new technology of strengthening structures with near surface mounted FRP has been proposed. The beams are strengthened using FRP inserted into a groove cut at the surface of the beam. It's a promising technology for increasing flexural and shear strength of a deficient reinforced concrete (RC) member effectively.Based on the results of two-point loading tests of 7 RC beams and the influence of spacing of CFRP strips, bonding area of CFRP and spacing of stirrups. This thesis studies the shear performance of the strengthening RC beams with near surface mounted CFRP strips. It describes the process and phenomenon of the experiment in detail, studies and analyses the failure modes and shear strength of the test beams, summaries the influence of three parameters. It gives the failure machnism. It present a simple and valid shear strengthen model. After comparing with the test results and theoretical results, it made sure of the validity of this model for practical engineering applications.