Wind-induced Buffeting Response Analysis Of High Pier And Long Span Continuous Rigid Frame Bridge

With the rapid development of the country's economy,highway bridges have been vigorously developed as an important part of economic construction.Nowadays,the focus of infrastructure construction in China is gradually shifting to the west.In the western region,there are many mountainous areas and complex terrain.The route planning needs to cross the mountain valley.The high-rise and long-span continuous rigid frame bridge becomes a major type of bridge,which is in the deep valley.The upper bridge is more strongly affected by the wind load than the bridge in the plain area,which will cause large deformation of the structure,which may cause construction safety problems,affect the quality of the bridge,and also affect the driving safety and driving comfort of the vehicle.The degree of fatigue causes structural fatigue and shortens the service life.Therefore,the study of the bucket vibration response of high-rise and long-span continuous rigid frame bridges in mountainous areas is a very significant topic.Based on the theory of highway wind-resistant design and the theory of time-course analysis of fighting vibration,this paper uses MATLAB,FLUENT and ANSYS software to study the main bridge of Qianmai River Bridge on the expressway in Yunnan Mountainous Area,and the high-rise long-span continuous rigid frame bridge.The numerical simulation and the wind-induced vibration response were studied.The main contents in this process include:(1)In the numerical analysis software MATLAB,the harmonic superposition method is used to simulate the pulsating wind speed in the construction stage and the bridge stage,and the matching of the simulated pulsating wind power spectrum and the target spectrum is verified.(2)According to the background data of the project,calculate the basic wind speed and the reference wind speed of the bridge.Calculate the three-component force coefficient of each key section of the bridge by using CFD software FLUENT,and fit the variation function of the three-component force coefficient with the wind angle of attack.The three-force derivative of the zero angle of attack.(3)Using ANSYS to establish the model of two working conditions in the construction stage and the bridge stage,calculate the structural dynamic characteristics,and based on the static wind load,perform the time domain analysis of the bucket vibration response,and find the displacement and internal force of the pulsating wind on the structure.Has a significant amplification.