Numerical Simulation Of Wind Wave And Study On Spatial Dynamic Response Of Long Span Continuous Rigid Frame Bridge

With the development of the world economy,land communication has not satisfied the current transport demand.The bridge over sea is built against this background.Because of the special geographical position of the cross bridge,the bridge over sea is often affected by the wind wave load,which affects the internal force and response of the structure.Causes a certain safety hazard to the structure.Currently,there are mainly methods of experimental research and numerical simulation for the influence of wind and wave on bridges.The experimental equipment and cost requirements are very high.Therefore,the development of numerical method of wind wave interaction is of great significance in the view of engineering application.Taking the large span continuous rigid frame bridge as the research object,based on the ocean engineering wave theory and buffeting theory of the bridge structure,the wind wave field is simulated by commercial software.Then the response pattern of the bridge under the action of wind and wave is studied.Main conclusions are as follows:(1)Based on the finite element theory,the finite element model of rigid frame bridge is established.And free vibration characteristics of the rigid frame bridge are analyzed.Based on the theory of ocean engineering,the relationship between parameters of wind and wave parameters is established.On this basis,the wind wave field is simulated by the computational fluid dynamics software FLUENT,and the velocity of the wave induced by the wave is determined by numerical simulation.(2)Compared with the response of bridge structure under wave action,the structural response increases with the increase of wave height.The wave period also affects the structural response.The maximum value of the displacement,acceleration and force of the structure does not occur in the same wave period.(3)Compared with the conditions of the 100 years frequency and 25 years frequency,the results of the relative physical parameters of the single wind show that the dynamic action of the combined wind and wave is stronger than that of the wind alone.Relative to the superposition of single wind and solitary waves,the displacement response reflects the coupling enhancement,while the stress of the base shows the effect of coupling weakening.