| The continuous girder-arch composite bridge,a kind of stable and beautiful structure,has been widely applied in high-speed railway engineering field,which combines the advantages of the continuous girder bridge and arch bridge.Along with the progress of engineering technology,this kind of bridge will be larger and softer that wind-induced vibration problems are more obvious which affect the driving safety and comfortableness.Thus,the influence of buffeting on bridges should be analyzed and evaluated in detail.A continuous girder-arch composite bridge is analyzed as the engineering background,the aerodynamic characteristic and the wind-induced response are studied in detail,providing reference for the study of wind resistance of the same type bridges.The main study is focused on the following aspects:1.Applied with the CFD numerical simulation method,three-dimensional wind field of the full-scale bridge model is established,and the aerodynamic characteristic is studied,the influence of the different wind attack angles,the height of bridge-clearance and the guardrail are analyzed in detail,providing reference for 3D numerical simulation of wind field of bridges.2.Applied with the software ANSYS,the finite element model of the bridge is established,the dynamic characteristic of the structure is analyzed,then the geometric nonlinear static wind response is studied in detail,static wind response of different wind speed and wind attack angle are analyzed.3.According to characteristics of the bridge and the natural wind,the wind speed time-history of the simplified three-dimensional fluctuating wind field is calculated,the study on the geometric nonlinear time domain buffeting response is carried out.Furthermore,the study is carried out about the influence of different wind speed and attack angle,the wind-induced response is analyzed in detail,some useful conclusions for wind resistant design are provided. |
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