Seismic Response Analysis And Vibration Reduction Control Of Cable Stayed Bridges

In the structure of the cable-stayed bridge,although the composition of the bridge structure is always composed of beam,tower and cable of the three representative members,but the structure can change,can be combined into a variety of complex forms of bridge structure.In the special structural characteristics,the existence of cables can give designers great freedom of design,and at the same time,the complexity of the overall structure of cable-stayed bridges will be promoted to many statically indeterminate structures.Therefore,the relative small change of the cable force of the bridge will also affect the significant changes of the internal forces of the main beam and the main tower.In the analysis of the structure in the end how to accurately apply the initial cable of cable-stayed bridge cable force,and how to optimize the overall load of initial cable force of cable-stayed bridge,is to ensure the bridge state of cable-stayed bridge is the key of reasonable stress state.According to the stress characteristics of the cable-stayed bridge,and engineering to cable force,based on the actual project,a comparative analysis of the advantages of different methods of applying method of initial cable force and the insufficiency,the final iteration is applied to the initial temperature of cable force of cable-stayed bridge.On the other hand,in applying the two dead load will make the cable force change cable in cable-stayed bridge,the bridge structure according to the change of internal force influence the problem,explore the rigid support method and constrained optimization of cable force method and application characteristics of unconstrained optimization method and optimization method of cable force,the minimum bending energy method,namely through the control of the main girder and the tower bending moment,the main girder and tower in the moment state under reasonable applying two dead load after cable-stayed bridge cable force optimization and adjustment,and contrast adjustment of cable force and influence on seismic response,the influence degree of the main girder and tower the internal force,it is necessary that the adjustment of cable force in the dynamic analysis before.In order to ensure the seismic performance of cable-stayed bridges,it is necessary to analyze the seismic response of cable-stayed bridges.The Gan River Bridge as the basis,the method of history analysis and seismic response spectrummethod,compared the seismic response of cable-stayed bridges,discusses the influence of damper parameters on seismic response,by changing the damping coefficient and velocity index reached the bridge damping,and puts forward some suggestions of practical engineering value of viscous damper.The local sub model is established by structural refinement,and the local stress of the maximum cable stayed force after the earthquake is analyzed to determine the safety performance of the local component of the bridge.Through the analysis,the research results can be used as reference for the project,and provide reference for similar long-span bridges.