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Study on Aerostatic Stability of Long-span Suspension Bridges

Author: LiWenJie
Tutor: HuangPingMing；MeiKuiHua
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Suspension bridge Aerostatic stability Nonlinear Finite Element Method Static wind load Critical velocity
CLC: U448.25
Type: Master's thesis
Year: 2009
Downloads: 185
Quote: 6
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Abstract


Bridge span is increasing, making the bridge structure under wind loads in the dynamic and static problems have become increasingly prominent. According to model wind tunnel test results at home and abroad, long-span bridges occur Calm wind speed may be lower than the critical buckling dynamic instability of critical velocity; addition, the strong static wind loads, geometric nonlinearity and nonlinear static wind load for long-span bridges are aerostatic stability can not be ignored. Thesis Hurongxi Siduhe State Road Bridge as engineering background, for large span suspension bridge aerostatic stability were studied. Thesis work and major achievements are: 1. Explains the current \Two-dimensional and three-dimensional method for a simple derivation. Elaborated traits suspension vibration analysis method to calculate the four cross the river bridge and modal shapes. Linear equation method to calculate Siduhe Bridge on the critical velocity of aerostatic stability. (2) a brief introduction to the theory of spatial stability first and second class of problems, elaborated stability theory and nonlinear static wind several methods, and these types of stability theory for a simple comparison. Describes the use of finite element program MIDAS aerostatic stability analysis of the calculation method. 3 using MIDAS finite element program for Siduhe bridge aerostatic stability analysis, nonlinear buckling analysis and linear elastic buckling analysis and calculation results aerostatic stability of linear equation method to compare the results found that: whether or not considering a big gap between the results of nonlinear and linear elastic buckling analysis of the results can be considered the upper limit of nonlinear buckling analysis, linear formula method of calculation may overestimate their ability to stabilize the structure of static wind. 4 Suspension aerostatic instability process for the whole process analysis, the third force is a comprehensive consideration of the critical wind speed aerostatic stability, and calculate the main cable and the main tower structure static wind load on the stability of the wind . 5, respectively, using the linear formula method and nonlinear finite element analysis of the initial wind angle of attack on the suspension bridge different aerostatic stability. 6 Calculate the velocity of spatial inhomogeneity on suspension bridge aerostatic stability, wind speed and the width of the spatial distribution of different parameters asymmetric distribution aerostatic stability of the structure has a great influence.

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