(45+75+172+75+45)m Seismic Response Analysis Of Curved-string Stiffened Continuous Girder With Steel Truss

At present,China's "Code for Seismic Design of Railway Engineering GB 50111-2006" has different requirements for the seismic design of prestressed concrete bridges over 120 m and the general medium and small span bridges.The former does not give a clear design.Norm,but the seismic response of large-span railway bridges is complicated,and its features are more difficult to grasp.Therefore,it is necessary to study the seismic response of long-span bridges.In this paper,the finite element analysis software Midas Civil 2015 is used to model the dynamics of Zhengzhou-Zhoukou-Fuyang(45+75+172+75+45)m Curved-String Stiffened Continuous Girder With Steel Truss,and it has encountered many encounters and rare encounters.Response analysis under earthquake.The main tasks completed are:(1)The seismic damage types,causes and seismic response analysis methods of bridge structures are summarized.(2)The simulation method of the interaction between specific components and pile-soil in the seismic analysis is discussed,and the dynamic characteristics of the bridge are analyzed.(3)Using the response spectrum analysis method to study the changes of internal force and displacement response of the upper chord of steel trusses,main beams and piers under the action of longitudinal,vertical and vertical three-direction earthquakes.(4)Three seismic records were selected according to the specification,and the seismic response analysis of the bridge was carried out by time history analysis.And this part of the results were compared with the response spectrum results.(5)The plastic hinge unit is built at the bottom of the pier,and the response of the bridge piers under rare earthquakes is analyzed by elastoplastic method.