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Study on Style and Mechanism of Aerostatic Stability for Long Span Bridge

Author: OuYangWei
Tutor: LiYongLe
School: Southwest Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: Long-span bridges Finite element method MARC Aerostatic stability Static wind load
CLC: U441.2
Type: Master's thesis
Year: 2007
Downloads: 181
Quote: 6
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Abstract


With the increasing span of the bridge , the bridge structure under wind loads static stability issues have become increasingly prominent . According to the results of wind tunnel model test at home and abroad , the long-span bridges the aerostatic stability issues critical wind speed may be lower than the critical wind speed of dynamic instability . In addition , the strong wind loads , long-span bridges geometric nonlinear static wind load nonlinear effects can not be ignored . Therefore, on the basis of comprehensive consideration of static wind loads on non-linear and geometrically nonlinear impact , the use of wind load incremental method of combining with the two-fold iteration ( geometrically nonlinear the convergence iteration of wind load coefficient of tri convergence iterations) based MSC.MARC and Python scripting language , developed the corresponding calculation control analysis program . Use the aerostatic behavior and instability of the whole process of analysis of this procedure on a suspension bridge and a cable-stayed bridge ; aerostatic stability law and by way of a component to increase the coefficient of tri reveals explore the mechanism of instability of long-span bridges aerostatic ; also investigated under different initial angle of attack the structural instability path and force status with the third force coefficient curve changes ; Finally, the static wind stable linear and non-linear calculation method were compared. Aerostatic based on MSC.MARC and Python scripting language stability analysis calculated stability, speed , should be introduced.

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