Experimental Study Of Unbonded Prestressed Concrete Beams Reinforced With Carbon Fiber

Reinforcement technology of prestressed carbon fiber plate is a combination ofthe prestressed technology and high performance carbon fiber material, not only canmake the high strength carbon fiber material, but also can improve the reinforcementeffect greatly. It is the research focus and thereinforcement technology.General prestressed carbon fiber reinforcement technology refers to the carbonfiber plate affixed to the surface tension of the reinforced structure reinforcementtechnology, is a bonded prestressed. However,when the carbon fiber plate thicknessis large (or larger amount ofreinforcement), or when the adhesive fails due tovarious reasons, it is very limited to rely on shear bonding layer stress transfer. Infact, prestressed carbon fiber board has become external prestressed carbon fiberplate, instead of surface bonded prestressed. For in vitro prestressed carbon fiberreinforced components, there is no relevant research data at home and abroad, thepaper design and experimental study of unbonded prestressed carbon fiberreinforced concrete T-beam test a large proportion of the main results obtained are asfollows:①At higher prestress levels (the test up2113.1Mpa), the smaller the totalprestress loss of prestressed carbon fiber, and less than3%, he explains the use ofprestressed anchor hinge waveform craft work high efficiency, it also shows thecarbon fiber at higher stress relaxation rate, is an excellent pre-stressed materials.②External prestressing unbonded prestressed carbon fiber loss in post-tensioning and anchoring stage phase conducted experimental research andtheoretical analysis, several factors prestressing loss: the anchoring devicedeformation of concrete elastic compression stress relaxation prestressed carbonfiber, concrete shrinkage.③Load test results in vitro unbonded prestressed carbon fiber reinforcedconcrete T-beam shows that the size effect on crack width of prestressed structureslarger deflection structure to little effect.④Theoretical and experimental values of stress increment of unbondedprestressed carbon fiber deflection and energy method to calculate the comparativeanalysis. ⑤Analysis of unbonded prestressed carbon fiber reinforced concrete beamflexural carrying capacity and comparative analysis of the theoretical value of theanti-camber deflection values with experimental values.More research on the design of unbonded prestressed carbon fiber reinforcedconcrete beams calculation is instructive.