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Mechanics Characteristics Analysis on Cable-Stayed-Suspension Bridges

Author: WenZuo
Tutor: ShenRuiLi
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Cable - Suspension Bridge Static characteristics Dynamic characteristics Finite Element Analysis
CLC: U448.27
Type: Master's thesis
Year: 2007
Downloads: 244
Quote: 3
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Abstract


Cable - stayed suspension system bridge is a cable-stayed and suspension bridges collaborative use of the new bridge type. Cable - stayed suspension system bridge can give full play to the cable-stayed bridge, the advantages of a suspension bridge, to compensate for their deficiencies. In some special cases, such as soft ground environment, strong typhoon areas, cable - stayed suspension system bridge better display its unique advantages. However, at home and abroad this bridge type less. In this paper, a main span of 1692m of cable-stayed - suspension system design bridge as the research object, using the finite element software modeling, compare BNLAS the structural design parameters of the structure. The paper begins with a brief review carried out by the cable - stayed bridge development status of the suspension system, as well as at home and abroad this bridge type study, then describes the structural characteristics and mechanical characteristics of this bridge type; finite element software BNLAS, with a main span 1692m of cable - stayed suspension system design bridges to establish the analysis model, rigid support continuous beam method and the bending energy minimization method to determine the reasonable finished dead state cable force, and two sets of cable force conducted a comparative analysis, the analysis found that two ways to determine a reasonable cable force is similar; force characteristics of the structure, the structure dead load of the main beam internal force, the main beam internal forces under live load and deflection, structural influence line; analysis main beam high, pylon stiffness, the main cable vector high, the main cable side of the main cross-ratio, side cross auxiliary pier and support systems for these structural design parameters in the live load and earthquake on the structure of the internal forces, deformation, the main cable live set out the impact of the level of tension; paper analyzes the cable-stayed, suspension stiffness coordination of the junction. The analysis revealed that the cable - stayed suspension bridge main cable pull system is smaller than the same span suspension bridge, thereby reducing the project cost can be reduced by the use of the amount of the main cable and anchorages. With respect to bridge, has good stability due to the oblique part of the role, such bridge type. Structure found by comparing the major structural design parameters, the main beam stiffness increases and the increase in the number of auxiliary piers can be more effective to improve the mechanical properties of the structure, cable-stayed, suspension stiffness coordination and structure the junction overall stiffness. Hope I can get the benefit of such bridge-type preliminary design recommendations for the analysis and discussion of the system of cable - stayed suspension bridge mechanical characteristics.

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Cable-stayed bridge
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