Study On Wind-induced Buffeting Response Of Canyon Terrain Of PC Composite Box Girder Bridge With High Piers With Corrugated Steel Webs

As countries of the western development strategy is put forward,the western mountainous area highway transportation enterprise development,the bridge across the canyon topography is more and more and more for high pier bridge.Corrugated steel web PC composite box-girder bridge because of its light weight characteristics become more and more popular.But is very sensitive to the positive role in the wind.It tends to vibrate.Canyon topography and wind environment more complex,of which the chattering all can happen in any wind speed conditions,bridge at construction stage due to incomplete of the structural stiffness is small,especially in the largest cantilever state,vibration is more noticeable.Influenced by buffeting response,during the construction of the bridge are prone to fatigue damage even structural failure.Into a phase of the buffeting response of bridge can also cause premature fatigue damage bridge structure.Therefore,it is necessary to study the chattering response of bridge structures caused by wind load.Taking rouge river bridge as the research object,using the Matlab software to simulate the fluctuating wind field near the bridge,In Fluent software platform,the scene of the bridge wind simulation environment position.The chattering response of bridge was analyzed by Midas software.The main contents include:（1）Harmonic synthesis method was used to simulate the rouge river canyon pulsating wind bridge fluctuating wind field,and the combination of fluctuating wind power spectrum with the target spectrum,the accuracy of calculated fluctuating wind speed can be used in the impulse response analysis.（2）Based on the CFD theory,using Gambit to rouge river canyon terrain modeling,the wind field is simulated environment,near the bridge girders is studied under different wind Angle of attack of the wind field distribution,Of three component of main girder cross section coefficient and static calculation(lift₍(1（1）,resistance,static moment).（3）The maximum cantilever state of the bridge was established based on Midas software finite element model of main girder and bridge completion stage,and the buffeting force of the calculated nodes was applied to the model.,the buffeting response of the bridge,through the analysis to determine the buffeting response of the position of the biggest influence on bridge structure.Analyze the buffeting displacement,and analyze the buffeting response of the impact of comfort,the influence of buffeting response compared with comfort index found smaller influence on the comfort of driving.