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Mechanics Performance Analysis of the Super-span Suspension Bridge with CFRP Cables

Author: BiYinBo
Tutor: MeiKuiHua
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Carbon fiber reinforced polymer (CFRP) Suspension Cable Static Analysis Vibration characteristics Wind stability
CLC: U448.25
Type: Master's thesis
Year: 2010
Downloads: 112
Quote: 3
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Abstract


In the new century, large span suspension bridge designers study more and more attention, especially the new material in the large span suspension bridge in applied research. Because large span suspension bridge flexible large, geometric nonlinear effects prominent, so that the mechanical properties of the state into the bridge with wind stability problems become complicated, therefore, to carry out related research in this area is necessary. In this paper, rope suspension bridge with CFRP cable cable suspension bridge wind stability, mechanical properties and do basic research and analysis. First, the system elaborated computational theory of suspension bridges, including the theory of elasticity and deflection theory, and at this stage using finite displacement theory and the theory of analytic calculation and comparative analysis of the advantages and disadvantages of the latter two theories for the analysis of the mechanical properties of suspension provided a theoretical basis. Secondly, using the finite element method comparative analysis of main span 2000m, 3000m level CFRP cable suspension bridge cable suspension bridge with steel cables and CFRP cable suspension bridge 5000m level static performance, including dead load, vehicle load, temperature loads static performance. CFRP cable suspension bridge in the constant tension of the main cable loads, hanging cable cable cable forces are less than suspension, but the stiffening girder bending slightly; loads in the automotive vertical displacement and torsion angles are greater than wire rope cable suspension bridge, but the amount of deformation are not meet the actual needs; temperature effects on cable cable suspension bridge a greater impact on the CFRP cable suspension bridge effect is very small, which is composed of two materials with different coefficients of linear expansion of the result. Again, using the finite element method comparative analysis of main span 2000m, 3000m level CFRP cable suspension bridge cable suspension bridge with steel cables and CFRP cable suspension bridge 5000m level dynamic performance, including structural vibration characteristics of the vibration frequency. CFRP cable and wire rope suspension bridge cable suspension bridge similar to the shape of the first vibration mode, CFRP cable suspension bridge is slightly smaller than the lateral vibration baseband cable wire rope suspension bridge, vertical vibration fundamental frequency slightly, reversing the fundamental frequency has risen markedly, contortion frequency ratio significantly accounted for excellent wind stability. Finally, the article also raise large span cable suspension bridge wind stability CFRP structural measures conducted a preliminary study for further wind-induced vibration, seismic and other studies provide analytical basis. Through the establishment of different forms of structural model cable, including cross sling model, spatial modeling and cable main cable truss bridge model, comparative analysis of several major programs wind stability, has a certain reference value to draw some conclusions.

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Suspension Bridge
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