Experimental Study Of Prestressed Carbon Fiber Reinforced Damaged Components

Bridge as a link between regional economic development, plays an importantrole in road traffic. However, due to the long-term cumulative damage, or due toaccidental loads, such as earthquakes,overloading and other causes, bring aboutserious damage to part of the bridge, so urgent, fast, effective bridge reinforcementtechnology is very important. Quick prestressed carbon fiber reinforcementtechnology is an active reinforcement technology, which integrates the advantages ofCFRP reinforcement technology and prestressed reinforcement technology, to achieverapid and effective Reinforcement for bridge structure.and it is currently a hot andfrontier research at home and abroad, but also is a very broad application prospectsreinforcement technology. Prestressed carbon fiber reinforced trials were conducted inthe past, most of the components were relatively good state and were firmed, thereinforcement of the test components damaged serious has not been publicly reported,so in this article studied a severely damaged (crack width reaches1.5mm) concreteT-beam component.After the T-beam was reinforced by prestressed carbon fiber, itscarrying capacity and the performance of the deformation improved significantly.thetest obtained the following important results:①Although the initial crack width of the component damaged severely was large,but after prestressed carbon fiber reinforcement,the crack width significantlyreduced,and after observed the discharge loss and long-term loss of prestressed carbonfiber,the test showed that long-term loss was very small,less than1percent of thethird times tensile stress.②Throughout the loading process of the trial,until the crushing of concrete onthe edge,carbon fiber anchor did not occur to failure,and the peeling did not occurbetween the carbon fiber and the member.Carbon fiber remains intact, and the carbonfiber is better to work together with the T-beam member,effection of reinforcementclose to that of general micro-damage component reinforcement.Indicating quicklyprestressed carbon fiber reinforcement can better recover and improve the capacityand performance of the force to the original structure.③Theoretical analysis shows that based on the use of flat section assumption andinternal forces balance, calculation was good agreement with the experimentalresults.Indicating that the mechanical model based on the traditional flat section assumption can be better predicted work performance of prestressed carbon fiberreinforced and flexural members.Above rapid reinforcement study to the members seriouly damaged,there isgreat valuable to engineering application of emergency rapid rescuing the carryingcapacity of the bridge in the emergency of bridge emergency rescue,disaster reliefand so on.