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The Stability Analysis of Concrete-Filled Steel Tube "Fly-Bird-Type" Arch Bridges

Author: TianLu
Tutor: ZhangXieDong
School: Wuhan University of Technology
Course: Road and Railway Engineering
Keywords: CFST Arch Bridge Delphinium style Stability Nonlinear Safety factor
CLC: U441
Type: Master's thesis
Year: 2011
Downloads: 43
Quote: 0
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Abstract


CFST arch bridge has the advantages of light weight, strength, resistance to deformation, better adapted to the modern bridge building required to achieve material saving, light weight, simple construction, large carrying capacity installed many of the demands closer years has been the rapid development and wide application. The the delphinium-CFST Arch Bridge as a unique bridge type, bridge engineers are constantly being favored its excellent aesthetic image and strong advantages of steel pipe concrete materials. However, after all, belongs to the new bridge, all aspects of the theory and technology is not very sophisticated, many issues there are to be studied, and then analyze the stability, explore, research becomes necessary. In this paper, on the basis of the basic theory of expounding the mechanical properties of the steel pipe concrete arch bridge stability calculation theory and structure of non-linear finite element method to span 55 240 55m the Jianghan five bridge engineering background, delphinium steel tubular The stability of the concrete arch bridge modeling analysis. MIDAS and ANSYS two large general-purpose finite element software delphinium-CFST arch bridges were established structure calculation model, numerical simulation analysis, linear elastic and elastoplastic stability of its construction process and the bridge stage conditions were obtained all kinds of conditions stable safety factor, buckling mode and second type of stability safety factor. Model derived linear elastic structure stability safety factor significantly larger; geometric nonlinear analysis results derived structural stability safety factor and linear elastic or less geometric nonlinear CFST Arch Bridge stability was less affected; consider material nonlinearity factors calculated critical load values ??significantly greater decline than line elastic analysis and geometric nonlinear analysis results. While CFST Arch Bridge instability occurs in the elastic and plastic deformation range, that arch lateral buckling occurs when the structure of the stress is greater than the elastic limit of the material, geometric and material nonlinear theory to obtain the arch bridge instability of the stability of the load of the ultimate load is the arch bridge. Finally, expand the discussion of the main factors to affect the stability of delphinium CFST Arch Bridge. Arch-axis coefficient were calculated to analyze the rise to span ratio, wide-span ratio, rib rigid boom stiffness, boom For uninsured force, and the number of wind bracing form and stiffness of various factors on the delphinium steel tubular concrete arch bridge stability, structural stability of influencing factors in the study of the different values ??of status value or form a reasonable range.

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics
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