Numerical Simulation Study Of Tri-component Force Coefficient Of Continuous Rigid Frame Bridge With Loing-span And High-pier

With the rapid development in infrastructure, Long-Span Rigid Frame Bridges with High Piers have found wide application in our country. With the increase of pier height and span length, the wind-resistant security of the longest cantilever of the bridge under construction is one of the issues must to be concerned. So it is necessary to research the wind-resistant behavior of the continuous rigid frame bridges with large-span and high-pier.Based on FLUENT software platform, this thesis studied the wind field of the continuous rigid frame bridges with large-span and high-pier during the longest cantilever construction stage with numerical approach, and the main contents of the paper can be summarized as follows:Firstly, The Pingzishang bridge located in Gui Zhou is chosen as the research object in this paper. Basing on the actual geological and construction conditions of it, the influence to the static coefficients of deck cross sections at different attack angles for the beam height by the 2D numerical simulation of flow field is studies in detail.Secondly, the aerodynamic interference effects on the mid-span section deck's static coefficients of twin decks bridge with the same height at different distance are studied and preliminarily discussed the flow field characteristics of twin decks bridge with the different height from practical project.Thirdly, a 3D computation model of the mid-span section deck was established, the similarity and difference between 2D and 3D numerical simulation of flow field are compared also.Forthly, the 3D numerical simulation of flow field of the single deck and the twin decks bridge at the longest cantilever construction stage were built up, and the 3D wind field by the actual size of the bridge preliminarily was studied.Adopting the numerical approaches to study the wind field characteristics of the bridges, this thesis obtained the intuitionistic and imaginal flow field characteristics, and the results showed that it is feasible to study the wind field of the bridge by applying 3D numerical simulation to the flow field.