Research On Stiffness Calculation Of Box Girder Based On FRP Reinforcement

Because FRP materials have the quality of light and thin, high-strength reinforcement, good reinforcement efficiency, etc. FRP materials are widely applied to the structural reinforcement. Domestic and foreign scholars on the FRP reinforcement member studied. They studied the mechanism by force range from FRP reinforcement member, anchorage, factors, etc., including a very wide scope. But few scholars for FRP reinforcement box girder stiffness change research later, the box girder plays an increasingly important role in the current development of long-span bridges. For FRP reinforced box beam stiffness in normal use is the ideal stage for the normal operation of box girder could play a decisive factor. This article on the basis of domestic and FRP Reinforced concrete stifmess, combined with the national973Program" application of FRP to achieve basic research "major engineering structure performance and long life (2012CB026205), on8CFRP box beam to simulate analysis and theoretical analysis, and on the basis of research on the use of FRP reinforced box girder in the normal phase stiffness formula derivation, validation. The main contents of this paper are as follows:1) Theoretical and experimental researches on FRP reinforced concrete beam of aspects of the profile, while the stiffness of FRP reinforced concrete beams formulas were analyzed according to their derivation formula, the assumptions to simplify the analysis of FRP reinforced formulas advantages and disadvantages.2) Using ANSYS finite element software FRP reinforced box girder numerical simulation analysis, the analysis carried out in three stages of box girder mechanical characteristics according to the results of numerical simulation, while analysis of FRP reinforced box girder, box girder stiffness change case, and pointed out the comparative analysis of the test when used in this paper some numerical simulation accuracy.3) FRP reinforced box beam influencing factors were analyzed by comparative analysis of the main factors affecting the determination of FRP reinforced box girder, box girder for the derivation formula FRP reinforcement to prepare; paper presents FRP reinforced box girder under different circumstances the stiffness of the equation, and using test data collected for verification of the formula, the formula obtained in this paper has a certain stiffness precision engineering to provide guidance for reinforcement.