The Study Of Mechanical Performance Of Strengthening Reinforced Concrete Beam Using Double Prestressed Carbon Fiber Plate

Prestressed carbon fiber reinforced beam can give full play to the strengthcharacteristics of the fiber material and increase the bending stiffness, yield and ultimatebearing capacity of the beam and improve the fatigue life of components, etc. In recentyears, more and more research on prestressed carbon fiber reinforcement technology arecarried on. It has became research hotspots in the field of strengthening technology andcutting edge. Up to now, most studies adopt tensioned single layer of carbon fiberreinforcement. But for long-span bridge and less space structure (such as large span Tbeam), the use of a single prestressed carbon fiber, in a narrow space, only allow toarranged a small number of carbon fiber, which exerts small prestress value. As a resultthat the reinforcement effect is not obvious and it can not meet the design requirements.If we can use two or more layers of carbon fiber reinforcement, in the same conditions,the reinforcement quantity and prestressed is bigger, and it is more easily to meetengineering needs. As no studies on multi-layer carbon fiber reinforced, this article wastested in this area to explore.This article tests using the hinge the waveform anchor carbon fiber tension anchorsystem to take the corresponding experimental study of three7.2m reinforced concretetest T beams. The research is mainly focused on the double carbon fiber reinforcedprestressed concrete T beam performance of the force, and obtained the followingresults:(1) reinforced concrete beam with three pieces of batch production as test objectwere adopted. One was chosen as a contrast beams; the other applied a single layer ofcarbon fiber on2000MPa tensile stress control; the third applied double carbon fiber on1500MPa tensile stress control. Three test beams was observed, such as forcecharacteristics, failure pattern, carrying capacity, phenomenon of crack developmentand test beams with prestressed carbon fiber deformation interoperability test, test thehinge the waveform anchor anchorage performance and prestressed carbon fiberreinforced practicality of the construction process.(2) Under the condition of laboratory, carbon fiber applied2000MPa and applied1500MPa double carbon fiber prestressed carbon fiber observation bonding system prestress loss analysis of its influencing factors. Analysis of test data derived fromobservations, it is recommended that the waveform anchor bonding system, the lossesof carbon fiber prestressed is low.(3) Under the condition of simply supported, three beams was tested with the staticload test. The results showed that prestressed carbon fiber reinforcement technology cansignificantly improve the member carrying capacity, flexural rigidity, reduce thedeformation of members in the use phase, give full play to the longitudinal tensilestrength of carbon fiber, carbon fiber and good tensile reinforcement interoperability,shared the stage imposed loads.(4) Waveforms can be a good anchor holding and anchoring layer carbon fiber,carbon fiber and guarantee double the prestressing process and the static load test of theforce line. Under the same anchorage measures, it can exert prestress level is higher, thebetter applicability. And under the same level of prestress, multi-layer carbon fibersafety margin is higher. For long-span bridge reinforcement, has important practicalsignificance.The above test results show double prestressed carbon fiber was well involved inthe T beam and reinforcement effect is much more remarkable than single carbon fiber.This outcome for T beam bridges and long-span bridges reinforcement has a veryimportant practical value.