ANALYSIS OF REINFORCED CONCRETE BEAMS STRENGTHENED WITH NEAR SURFACE MOUNTED FRP REINFORCEMENT

摘要

Effective technology for increasing flexural capacity of reinforced concrete structures with near surface mounted (NSM) carbon fiber reinforced polymer (CFRP) reinforcement is presented in the paper. Flexural behavior of the strengthened beams and failure modes of tested beams are discussed. Parameters investigated include the thickness of a concrete cover and density of CFRP reinforcement. The test results indicated that application of the NSM CFRP strips significantly increased load bearing capacity and improved the stiffness of the beams. Failure of all members was resulted by increasing of deflections, crack widths and gradual loosing of adhesion of the CFRP strips to the concrete cover. This technique is more effective than externally bonded CFRP reinforcement, provided higher strength capacity and higher utilization of the strip. A non-linear model of reinforced concrete members was used for analysis. The calculated results correspond to the test results over the entire range of loads.