Theoretical and Numerical Analysis of Reinforced Concrete Beams Strengthened with Externally Prestressed CFRP Bars
With the increase of service time and vehicle load,old reinforced concrete bridges face with many problems such as insufficient bearing capacity,deformation overrun,etc.The use of externally prestressed CFRP reinforcement is an effective solution.In this study,finite element analysis software ABAQUS is used to conduct numerical simulation and parametric analysis on a railway bridge with a span of 24 m.For the different diameters(31 mm,43 mm,61 mm)and prestress levels(250 MPa,500 MPa,750 MPa,1000 MPa,1250 MPa)of CFRP prestressed tendons,the cracking bending moment of the model beam,the yield bending moment of the reinforcement at the bottom of the beam and the midspan deformation when the beam cracks can be obtained.By comparing the theoretical calculation results of current Chinese codes such as Code for design of concrete structures(GB 50010-2010)with the numerical simulation results,it can be found that they are in good agreement,with an error of less than 15%,which verifies the rationality and accuracy of the formula for calculating the cracking moment of reinforced concrete beams,the formula for calculating the bearing capacity of normal sections and the formula for calculating the mid span deflection in the codes,for strengthening reinforced concrete beams with externally prestressed CFRP bars.This study provides references for the reinforcement design of practical projects.
prestressed concrete beamCFRP reinforcementABAQUSfinite element analysistheoretical calculation
万方数据
维普
