Study On The Mechanical Characteristics Of Railway Continuous Beam Arch Combination Bridge

Continuous beam arch bridge with concrete-filled tubular is a new development bridge type in recent years, it is a technology of bridge building that continuous concrete beam and steel is combined. The bridge type gives full play to the advantages in mechanical aspect of arch and beam, and it has the Characteristics of large span capacity and structural stiffness, and it presents beautiful shape as well as excellent technical and economic index. Dynamic characteristics of the structure itself is affected by factors in many aspects, therefore, Parameters of Component reasonable or not will directly affect the dynamic characteristics, as well as affect internal force and displacement of structure under seismic action.This thesis is based on Nanchong Jialing River Bridge as a background, first of all, BSAS software is used to establish static model, and a static calculation is carried out, and then the finite element model of structure is built with ANSYS software, and analysis of the dynamic characteristics is carried out as well as analysis of seismic response.Analysis of various factors on the dynamic characteristic is carried out in this thesis, and the interaction of between continuous beam and arch rib is revealed. Response spectrum analysis and time history analysis of structure is carried out, and internal force and displacement of structure is obtained, and then comparative analysis with live load is carried out, and some useful conclusions are obtained.Through the calculation results of this thesis, we found:The calculating model must just simulates the stiffness and mass distribution as well as boundary conditions of the structure, and dynamic characteristics of structure can be better reflected. It has very important significance to seismic behavior of structure that the effect of K brace position, thickness of steel arch rib, number of brace, rise-span ratio and beam stiffness is comprehensively considered. For the special bridge, after carrying out the analysis of response spectra, time history analysis of the structure carrying out can more really understand the response of structures under earthquake.