The Research Of Wind Characteristic Parameters And Aerostatic Stability Of Self-Anchored Suspension Bridge

With the implementation the strategy for the development of the western regions, the mountainous bridge project is increased rapidly. Due to the stress transfer is concise, clear, can make full use of the main bearing component of high-strength steel material strength, strong spanning capacity, superior performance and overall modeling fluent beautiful and construction safety and efficiency, suspension bridge is highly respected by designers. When air flows through the hilly areas, because of the particularity of mountainous terrain, the air velocity and air pressure on the mountain surface are significant different from that on flat area there, and its distribution is quite irregular. Therefore, it is of great significance to do numerical simulation and sum up the hilly wind characteristics. Main works in the thesis are as follows:1.3-D isolated hill model with gentle slope and 3-D isolated hill model with steep slope were built with FLUENT software based on fluid dynamics in this paper. And according to the comparison of the wind field of isolated hills with different slopes, the effect of isolated hills on air flow was analyzed, and changes of wind velocity as well as wind pressure of the wind field were worked out.2.3-D mountain pass model and 3-D gorge model were built by fluid calculation software FLUENT, and the effect of air flow's narrow tube effect on wind field was analyzed according to changes in wind angle.3. Through the establishment of the 3-D model of typical complex mountainous terrain, effect of complex mountainous terrain on air current and changes of wind velocity and wind pressure of the wind field were analyzed.4. By adopting finite element program MIDAS/Civil, we create a long-span suspension bridge model A. Both the linear method and the nonlinear finite element method are used to study the influence on aerostatic stability of anchored Bridge by different parameters. The parameters include initial wind angle of attack, The results might be reference for aerostatic design of anchored bridge.