Abstract:Based on the computational fluid dynamics CFD method, taking a landscape bridge to be constructed at a valley of Shenzhen as the study object, a three-dimensional segmental simulation model is established to study the aerodynamic performance. Firstly, the rationality of segment truss model is studied under the symmetric boundary condition, and it is concluded that the segment model can be used to replace the three-dimensional complete bridge for numerical simulation. Then, by comparing the three-dimensional complete bridge simulation with the selection method of aerodynamic parameters of truss bridge in the current domestic code, the inspection is made and the suggestions for improvement are put forward. The two-dimensional equivalent model is established by taking the outer contour and real area of the structural section of truss bridge as the control conditions. Four kinds of two-dimensional circular tube truss girder CFD calculation simplified model are used to calculate the static tripartite force coefficients of truss bridge at - 5°, -3°, 0°, 3° and 5° angles of attack. At the same time, based on an unsteady time history curve, the spatial flow structures and vortex-vibration performances of the four two-dimensional equivalent models are compared.
