Wind Field Numerical Simulation And Bridge Wind-induced Response Analysis Of Mountain Bridge Site

In recent years,more and more transportation infrastructure has been built in western mountainous areas.High piers and long-span continuous rigid frame bridges are often used for crossing deep valley canyons.The high pier bridge is usually higher than the water surface or the bottom of the valley.The stiffness of the bridge structure is relatively soft and sensitive to the wind.In addition,wind and narrow tube effects are easily formed between the valleys,the wind speed is larger and the wind speed increases with the increase of the height.In the construction period of the canyon bridge,the wind induced response is great.The turbulence in the strong wind may cause the safety of the bridge structure,the quality of the construction and the safety of the construction machinery and personnel,and even the bridge destruction.In order to further study the wind-induced response of the canyon terrain at the bridge site and ensure the construction safety of the high-rise and long-span rigid frame bridge in the mountainous area,the wind load response of the high-rise cantilever rigid frame bridge in the canyon during the construction period is studied as follows:1.Based on the theory of computational fluid dynamics,according to the elevation data of the Yanzhihe Bridge site at the Baoding section of the Xiqiao Baoding of the Taihang Mountain Expressway,the Gambit pre-processing software was introduced to simulate the topographic map and establish a three-dimensional numerical model of the bridge canyon.2.Through the field measurement of the wind field,the wind speed time history curve,the average wind speed and the gust coefficient are obtained,so as to compare the calculation results of the different calculation domain range and wind friction coefficient of the numerical model,and correct the numerical values.Calculate the model.3.The wind field characteristics such as wind pressure,wind speed and three-component force coefficient of the bridge sections in the wind field of the canyon area of the Rouge River Bridge site were calculated by Fluent software.Thedistribution of wind field was obtained by cloud image analysis.4.Based on the example of the Xifu Expressway Yanzhihe Bridge project,the mainstream bridge mechanics analysis software Midas Civil was used to study the wind-induced response of the maximum double cantilever state under the wind load during the construction stage of the prestressed concrete composite box girder bridge with corrugated steel webs.