Numerical Analysis Of Stresses Near Interface Edges In The Reinforced Concrete Beam Strengthened With Carbon Fiber Laminate

At present, most of the research for the reinforced concrete (RC) beamstrengthened with a carbon fiber laminate (CFL) is about the bending, shear, fatigueperformance as well as the stiffness under load at home and abroad. But the reserchof the singular stress distribution near the interface edge in the RC beamstrenthened with CFL is rare. This thesis measures the material constants of theCFL, and then based on the finite element method, the stresses near the interfaceedge in the RC beam strengthened with CFL are analyzed numerically under theconcentrated load and temperature change, respectively. The influence of thestrengthened length, the thickness and bonded angle at the end of the CFL as wellas the bonding layer thickness on the singular stresses near the interface edge isdiscussed by transfering the RC beam into a laminate beam with five layers, It canprovide a reasonable reference for the reinforcement design in engineeringstructure.The numerical results show that the RC beam strengthened with CFL cansignificantly improve strength and stiffness of the beam. The stresses near theinterface edge caused by the temperature rise are similar to those by theconcentrated loads. The stresses near the interface edge show obvious stresssingularity with the decrease of the distance from the interface edge. Beingdifferent to the RC beam bonded with a steel plate, The RC beam reinforced with aCFL is suitable at the higher temperature, which is beneficial to improve thestrength of the RC beam. The reasonable increase of the strengthened length andthe bonding layer thickness and decrease of the thickness and bonded angle at theend of the CFL can all effectively reduce the stresses near the interface edge.