Strengthened By Cfrp Reinforced Concrete Beams Pilot Study

Carbon fiber sheet ( CFS ) is a new method that reinforce the concrete construction, because it have the high strength, light weight, bear to decay, easy operation, not affect the construction of the shape and the external appearance, in recent years it has extensive application in reinforcing the concrete construction, research and develop carbon fiber sheet to strengthen the construction have importance of engineering application value.This paper proceeded the flexural experiment respectively of two flexural strengthen beam by CFS, one compared reinforced concrete beam, and proceed sheared experiment research of two U style stirrups of CFS combined compacted sheared strengthen beam, one compared reinforced concrete beam. analyze and compare some working characters such as width of cracks, the deflection and ultimate moment of an unstrengthen compared beam, an initial strengthen beam and a beam strengthened after crack by compacting .Glue to stick the carbon fiber the cloth to reinforce the reinforced concrete beam to suffer the to experiment to pan out the research to analyze the enunciation to beam bottom: that function and reinforcing bar that carbon fiber the cloth is similar, and the beam bottom glue the carbon fiber the cloth can show the anti- to increase the piece the loading dint; The early condition( is reinforced the beam if have already opened the ) that reinforce the ex- beam influence beam suffer load dint not very, reinforce the beam can adopt same alike of suffer the loading the dint calculation the formula; This text still calculation ({Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laminate )) CECS 146:2003 inside carbon fiber cloth reinforce reinforced concrete beam cut load dint the method proceeds the calculation method physics of the improvement, improvement empress the meaning is more clear and definite, with experiment the data to fit together than good, can satisfy the actual engineering the request that design. Reinforce crack width that the early condition of the ex- beam to normal usage appearance of beam contain obvious influence, according to this experimented to consequently bring upped the beam bottom to glue the carbon fiber the cloth to reinforce the beam's crack width and degree the calculation method.Suffer to shear to experiment the research the enunciation: Adoption carbon fiber U form hoop+ the layering reinforce suffering of the empress's reinforced concrete beam to shear to load the obvious exaltation of dint, and reinforce the early conditionof the ex- beam to suffer to shear to load the dint influence to beam not very, directly reinforce the beam with press the to behind reinforce the beam to have to suffer to shear to load the dint can all by the current ((Technical specification for strengthening concrete structures with carbon fiber reinforced polymer laminate)) the CECS146:2003 cut to suffer to shear to load the dint the calculation the formula calculation; Suffer to shear to experiment the result to express, adopt the carbon fiber U form the hoop at the same time+ the layering anti- shear to reinforce the beam of the empress, break the front to can appear the carbon fiber the cloth to rise the drum, shrivel or tear to pieces the etc. the breakage the omen, and make suffer to shear break suddenly the sex get a certain degree's improvement.