Natural Dynamic Characteristics And Seismic Response Analysis Of Curved Continuous Rigid Frame Bridge

In recent decades,earthquake disaster frequently occurred all over the world,and bridges are lifeline eengineering,oneedestroyed,it will bring great damage to the lives and properties of people .With the development of highway projeet,the span of continuous rigid frame bridge increased continuously,and in many times,it is neeessary to build long- span curved continuous rigid frame bridge in order to satisfy the request of route direetion and landform,but up to now,there are very few research about the dynamie response of the curved continuous rigid frame bridge,espeeially the seismie response characteristies,the thesis researched just on this background.In this thesis, two methods including speetrum response analysis and time-history analysis of earthquake are applied to Xian Long Tan bridge based on the basic theory of the earthquake response analysis.The main contnt in this thesis includes:①Establish the finite element model of bridge and considering the soil-pile interaction,and compares the dynamic characteristics of bridge under the different geological conditions and boundary conditions; in order to analyze the influence of curvature radius for the curved continuous rigid frame bridges,the analysis for the the same span and different curvature radiuses to the natural dynamic characteristic and seismic response of the curved rigid frame bridges.②It Analysises the vertical and horizontal seismic action on the curve continuous rigid frame bridges analysis of seismic response in different geological conditions;③Obtaining some valueable conelusions based of the study on results of response-spectrum and time- history of curved continuous rigid frame bridge.④The method nonlinearity analysis of earthquake is applied to curved continuous rigiframe bridge, analyzing the influenee of nonlinearity to the seismie response of the bridge;In this pape, from the earthquake response analysis of the curved continuous rigid frame bridge.these obtained conelusions will give some reference for practical earthquake resisting design of similar bridges.