The Design And Static Analysis Of Composite Box Girder Bridge Section

Composite material as a new material,with a lightweight,high strength,can be designned,good shock absorption performance,high fatigue strength,corrosion resistance,strength and better protection and concealed the role of excellent performance.In view of the bridge to protect our military forces in the importance of mobility and lack of existing research, this paper present research results,through numerical simulation method,designed the track-type box bridge section is to protect the military for 50T tracked vehicle load and 20T-class wheeled vehicle load.System and in-depth study of the composite box section btidge design methed,bridge section for thd overlay approach,cross-section forms of the preferred progam,as well as in the correspomding section of the vridge under load occurring issues such as bending and torsion deformation, this paper's main work and innovative results are as follows:(1) By reading lots of literatures, the development of domestic and foreign military bridge is summed up in detail, the application of composite material in military bridge structure and the theoretical of bending and torsion and other aspects of the composite box girder is studied and analyzed.(2) A Track-type Box bridge section is designed to protect the military for 50T tracked vehicle load and 20T-class wheeled vehicle load by using the finite element software MSC.Patran / Nastran with reference to the structural design of composite materials and military bridge section structural design requirements and guidelines. The overlay method, layer thickness, and the bridge section height and section of the form and other aspects of the laminated composite plate which composed the bridge section is designed respectively in detail.(3) Through the methed of numerical analysis, the corresponding finite element analysis model to the section form, layer thickness, bridge section height of the laminate layers is established. The influence of the changes of laminate thickness and box section form to the strength and rigidity of bridge section is analyzed. And a more reasonable and economic structure scheme is established by comparing and optimizing the numerical analysis results.(4) The bending, torsion and stress of the bridge section's wing plate and web in the corresponding two kinds of loads of the designed bridge section structure are analyzed respectively, and the maximum deflection and torsion angle is obtained. Meanwhile, the stiffness and strength of the bridge is checked.