Research On Pneumatic Type Selection Of A Door-shaped Bridge Tower In Suspension Bridge Based On Galloping

Large span suspension bridge develops rapidly with the development of the structure analysis and design theory as well as research and application of new materials. More remarkable problems of bridge tower’s wind-induced vibration also disappear with the increase of bridge span, the widespread use of high soft structures, its smaller relative stiffness and bigger influence of wind load on the bridge tower. In various wind-induced vibration of bridge tower, galloping would cause fatal damage.Based on a door type of suspension bridge tower, this thesis have a brief study on the galloping stability of tower bridge.To sum up, the main research work and conclusions includes:1. According to Den Hartog’s galloping theory, deduce the judgement basis of galloping section under wind from any direction. Make a exposition of the influence factors of galloping, which include resistant coefficient, lift coefficient and resistant coefficient of the slope and the lift coefficient slope, for any section except 0 degree were studied in the paper.2. Without considerate of aerodynamic interference between the pillar, the different cross section shape stabilities, corner cut size of pillar were studied based on CFD numerical simulation of the pillar calm wind coefficient.3.The influence of aerodynamic interference between the pillar on the static wind coefficient as well as on the galloping stability when the pillar in serial and parallel were studied.4.The study found that aerodynamic performance of concave right angle chamfer and concave right arc chamfer are similar and their effects on the improvement of the cross section of galloping are equivalent. Equilateral chamfering the galloping improvement of cross section is better than that of unequal chamfering, decrease the size of chamfering will lower section galloping stability improvement effect.5.The pneumatic interference between pillars had a small effect but a great influence on the back pillar when pillar in tandem. Due to the aerodynamic interference between the pillar, upper and lower pillar galloping performance basic symmetry while pillar in coordinate.6.The influence of different cross section shape on the galloping stability of pillar in serial and parallel were almost similar.