Static And Dynamic Teristics And Seismic Dynamic Response Analysis Of Down Bearing Single Ribbed Steel Box Arch Bridge

The single rib arch bridge as a bridge arch and beam consolidation,high rigidity,beautiful appearance,strong spanning ability,high bearing capacity,structure forms,good durability,convenient maintenance,low maintenance cost,control beam clearance under the advantages,in recent years in the high-speed railway bridge and highway bridge the design has been widely used.In order to explore the dynamic response characteristics and seismic performance of single supported arch bridge under non uniform seismic excitation,a three-dimensional finite element model of a 35m+130m+35m single rib through arch bridge was established by using finite element software,and the dynamic characteristics of the bridge were studied.The construction monitoring and analysis of the bridge,the response spectrum analysis and the dynamic time history analysis are used to check the deformation performance of the pile-soil action in different geological conditions.Through the study of two aspects of the static and dynamic characteristics of the bridge,the main conclusions are as follows:1.Simulate the whole construction process of the bridge,analyze the internal force and stress in every construction stage of the bridge,check the stress condition at the completion stage,check the stress under the train load and the winding condition of the main girder and the arch rib,all meet the corresponding specification requirements.2.Sensitivity analysis of structural design parameters during construction is carried out.The analysis of some key data in the field is more accurate to reflect the structural stress in the construction process.3.Using finite element analysis software MIDAS,the simulation structure model is established through single rib arch bridge with m method,the model of senior high school entrance examination into the pile-soil interaction,analysis and comparison of the pile-soil and pile-soil seismic response,considering the pile-soil interaction and closer to actual situation.4.The advantages and disadvantages of the two methods and the scope of use are obtained by the analysis of the reaction spectrum and time history.The seismic response analysis of the structure under different pile and soil conditions is compared.The response spectrum takes account of model 1 and model three in three directions,and considers the response of model 1 and model two in two directions and orthogonal combinations.5.The results of the response spectrum calculation and the time history analysis are compared and analyzed,and some useful conclusions are obtained.