Taking the Yichang Bridge over Yangtze River as example,evolutions of flutter stability with the deck erected by different sequences are determined by three-dimensional nonlinear flutter analysis,the role and mechanism of the static wind action and erection sequence in flutter stability of suspension bridges under erection are investigated and discussed in the paper.
With increasing span length of suspension bridges,the cable's diameter and also the wind load acting on it,the static wind action and the spatial non-uniformity of wind speed increase consequently,which may have an unnegligible influence on the aerodynamic stability of long-span suspension bridges.
By taking Runyang Bridge over the Yangtze River as example,effects of some factors such as the static wind action,wind speed spatial non-uniformity,and the cable's wind load on the aerodynamic stability of the bridge are investigated analytically.
The results show that the aerodynamic stability of long-span suspension bridges is significantly influenced by the static wind action,whereas the spatial non-uniformity of wind speed and the cable's wind load have basically no influence on it.
Numerical analyses are then performed for the Runyang Bridge over the Yangtze River and the influence mechanism and role of the aerostatic effects on the dynamic characteristics and aerodynamic behaviors of long_span suspension bridges are finally clarified.
In order to provide a systematic research about the wind-resistant analysis and design of long-span roofs, investigations on analysis of wind pressure distribution characteristics, wind load on cladding structures, static wind response and stability, wind-induced vibration characteristics, wind-resistant design methods, are processed on this thesis.
With an increase in span length of suspension bridges, the diameter of cables and the wind load acting on them increase consequently,which may has an unnegligible influence on the static and the dynamic wind action(mainly refers to the aerodynamic stability) of suspension bridges.
It is shown that the cable wind load affects remarkably the aerostatics of long-span suspension bridges,but its effect on the aerodynamic stability becomes negligible.
Progress in research on atmospheric pollution coefficient in China is reviewed in this paper. Research on atmospheric pollution coefficient in China can be classified into three stages: (1) The atmpspheric pollution coefficient formula was improved, considering effect of calm wind;(2) Based on analysis of relationship between wind speed and air pollutant concentration, the new atmospheric pollution coefficient formula was proposed,by using one-time monitoring wind speed instead of mean wind speed in calculation...
Progress in research on atmospheric pollution coefficient in China is reviewed in this paper. Research on atmospheric pollution coefficient in China can be classified into three stages: (1) The atmpspheric pollution coefficient formula was improved, considering effect of calm wind;(2) Based on analysis of relationship between wind speed and air pollutant concentration, the new atmospheric pollution coefficient formula was proposed,by using one-time monitoring wind speed instead of mean wind speed in calculation of atmospheric pollution coefficient; (3) Considering the comprehesive effect of wind speed,wind direction,and height of mixing layer,the expression of atmospheric pollution coefficient applied to regional, multi-source air pollution influence analysis was introduced. The expression of atmospheric pollution coefficient, considering the comprehensive effect of wind speed, wind direction, and height of mixing layer,is analysed in this paper. At last, the application of atmospheric pollution coefficient is discussed.
Long_span suspension bridges are very susceptible to the wind action and the nonlinear effects due to the static wind action have unnegligible influence on the aerodynamic behaviors(mainly refer to flutter).Based on the equilibrium state under the static wind action,an approach of three_dimensional nonlinear flutter finite element anaysis is presented,in which the nonlinear effects of structural dynamic characteristics and the aerodymamic forae caused by the static wind action are fully considered.The computational...
Long_span suspension bridges are very susceptible to the wind action and the nonlinear effects due to the static wind action have unnegligible influence on the aerodynamic behaviors(mainly refer to flutter).Based on the equilibrium state under the static wind action,an approach of three_dimensional nonlinear flutter finite element anaysis is presented,in which the nonlinear effects of structural dynamic characteristics and the aerodymamic forae caused by the static wind action are fully considered.The computational procedure is also programmed.Numerical analyses are then performed for the Runyang Bridge over the Yangtze River and the influence mechanism and role of the aerostatic effects on the dynamic characteristics and aerodynamic behaviors of long_span suspension bridges are finally clarified.
Structural stiffness of suspension bridge under erection is low so that its flutter stability is remarkably affected by the nonlinear effect due to the static wind action and the deck erection sequence.Taking the Yichang Bridge over Yangtze River as example,evolutions of flutter stability with the deck erected by different sequences are determined by three-dimensional nonlinear flutter analysis,the role and mechanism of the static wind action and erection sequence in flutter stability of suspension bridges under...
Structural stiffness of suspension bridge under erection is low so that its flutter stability is remarkably affected by the nonlinear effect due to the static wind action and the deck erection sequence.Taking the Yichang Bridge over Yangtze River as example,evolutions of flutter stability with the deck erected by different sequences are determined by three-dimensional nonlinear flutter analysis,the role and mechanism of the static wind action and erection sequence in flutter stability of suspension bridges under erection are investigated and discussed in the paper.
静风效应
static wind action
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