Test Study On Mechanical Performance Of C50 Concrete Cylindrical Confined By CFRP Under Axial Load

As China's economic development, the concrete building to the structure more complex and require higher strength direction, so that high-strength concrete in engineering more and more widely. However, the improvement of high-strength concrete with the strength, the brittleness of concrete increases, deformation worse, damage has been more sudden change.Carbon fiber is now confined concrete structures as reinforcement of domestic and international hot spots of engineering structures. Our late start this technology, but with China's economic construction and rapid development of transport, a considerable portion of the existing buildings at the design load standards as reasons for the lower result, some existing buildings to change the use of features is difficult to meet the needs of the current standard use, urgent in need of repair, reinforcement. Strengthen the reinforced concrete structure with traditional methods of comparison, CFRP reinforced have the advantages of high strength and efficiency, easy handling, corrosion resistance, fatigue, light weight and not increasing the structure size.Most of the research at home and abroad is on the FRP reinforced concrete structures common for FRP confined HSC component relationsh-ips; for concrete studies are focused on areas in the side column of FRP confined concrete cylinders of less. In this paper, bound for the C50 concrete cylindrical CFRP conducted the following studies:1,14 groups of CFRP by binding to C50 axial compression tested of concrete columns, analysis of different package layers, constrained way, the bar width and spacing of the different bands, on the ultimate load, failure mode effect of such constraints. All constraints, whether the specimen or sample strips, with parcels increased, the bar width increased, the band spacing decreased, the specimens showed more serious damage, the greater the ultimate bearing capacity, bound the better. 2,The experimental data analysed of the carbon fiber reinforcement with different amount of C50 on Concrete CFRP binding effect, and according to the test to fited the measured data, maked calculations of concrete cylinder wall bound CFRP confining factor k1 amended values, and to make the final bound C50 CFRP axial compressive bearing capacity of concrete formula.