Optimization Design Of A Concrete Arch Bridge Reinforced Engineering

In this paper, the Red River bridge was the research object, cracking the bottom of the existing bridge deck, the main arch radial cracks appear, wave longitudinal seam roof, cover the bottom of the beam and bottom beam cracks and other diseases, many reinforcement programs are proposed by calculating the ratio of reinforcement, and then propose a more reasonable reinforcement methods, it is not also meet the needs of the carrying capacity, but also make it more economically.(1) Firstly,we must analysis the disease of this bridge, to provide a basis for the further reinforcement reasonable method.(2) For cracks in the bottom of the bridge deck, and using CFRP and plates steel to reinforce method for bridge deck, and the carrying capacity of these two methods to calculate and compare the economic applicability. By calculation, when using these methods to make the bridge deck span to achieve the same bending capability, using carbon fiber sheet of economic performance is better. but calculated Shear by its ability to find, using the Paste steel method than CFRP method can improve its shear capacity. So choose Paste steel plate on the bridge deck reinforcement.(3) The main arch ring radial cracks on both sides of the bridge, box arch rib concrete cracking, peeling off and exposed tendons and other diseases and the lateral beam cracks. The strengthening method of main arch of the bridge and the transverse connection, horizontal linkages with bonding steel plate, the transverse girder and arch rib reinforcement cracking at the rigid connection. Reinforcement method of main arch ring according to the design scheme with both sides box pasting steel plate and sticking carbon fiber sheet type arch rib. Through the analysis of its static and moving load history analysis method using a smaller plate than with paste paste CFRP main arch span bridge vertical deflection and stress levels; while its modal analysis and buckling stability analysis showed that after pasting steel reinforcement to enhance structural rigidity and stability than the use of carbon fiber sheet method, based on the above analysis of the final method using paste steel reinforcement of the main arch of the bridge.(4) For the above of analysis, it need to optimize the horizontal linkages, two programs:firstly, it is only part of transverse beam reinforcement. Second, based on the results of a program to further optimize the research, and do not strengthening the lateral beam. Through the two programs static and dynamic analysis shows that:when using some of the horizontal linkages, arch across the deflection and longitudinal stress and little difference between the value of the original design calculations, while dynamic analysis, structural baseband and stability coefficients were reduced by11%and17%. When no horizontal linkages:structure in the static analysis, bridge vertical deflection and stress values larger than the original structure of the design value, and the dome tensile stress, while dynamic analysis, the fundamental structure and stability coefficients were reduced33%and41%. And when not horizontal linkages reinforce its stable value is less than specification values, so the second optimization results are impartial safe.(5) Based on the above of analysis, The bridge deck with bonding steel plate, the main arch ring of bonding steel plate and the transverse part of the design method of reinforcement.