Local Stress Analysis Of Anchorage Zone For Cable-stayed Bridge And Research On Vibration Reduction Technology

The cable-stayed bridge has developed rapidly in recent years due to its good mechanical properties,large span and beautiful appearance.With the development of cable-stayed bridge and the deepening of research,the vibration control of cable-stayed bridge has gradually become a hot topic in engineering application field.For lacking of seismic response data and the vibration control data of the cable-stayed bridge in the high seismic area,it is necessary to study the vibration reduction technology.As a week part of the cable-stayed bridge,it is necessary to clear the local stress distribution of the cable beam anchorage when focus on the design.It is one-sided when the design and research of the anchorage zone only consider the static load.Considering the effect of seismic action on the local stress of the anchorage zone is important to ensure the safe use of the cable-stayed bridgeThis paper takes the Xi He bridge as the engineering background,the concrete research are as follows:(1)Summarizing the theory of the bridge seismic design,vibration control,anchoring structure test and related theoretical research status.(2)Considering the effect of pile-soil-structure interaction on the seismic response of the bridge,using the finite element software midas Civil to establish the dynamic calculation model and to obtain the dynamic characteristics by performing modal analysis.(3)Using the time history analysis to analyze the seismic response of dynamic calculation model and the model with liquid viscous dampers.Through the analysis and comparison of the seismic response analysis results of the two models,the liquid viscous dampers can effectively reduce the seismic response of cable-stayed bridge.(4)Using the finite element software ANSYS to establish the finite element model of the cable-anchored section corresponding to the maximum cable force and carrying out the local stress analysis of each component of the cable beam anchorage zone.(5)In this paper,the optimal design scheme of cable beam anchorage zone is put forward to optimize the bridge safety reserve,carrying out the local stress analysis of cable beam anchorage zone and comparing the original design to analyze the optimization effect.(6)Based on the safety of the bridge structure,the influence of the seismic action on the anchoring structure is first included in the local stress analysis.The influence of the seismic action on the local stress of the cable-anchorage zone is analyzed.