Analysis And Depth-span Ratio Parameter Study Of High-speed Railway Prestressed Concrete Continuous Bridge

Highway and railway construction often need to cross rivers,canyons and other complex terrain in some areas,prestressed concrete continuous bridge has been widely used with its advantages of simplicity and beauty,good integrity,smooth driving and comfort,good seismic performance and so on.Firstly,the thesis introduces the development situation of prestressed concrete continuous bridge at home and abroad,and summarizes the main construction technology and characteristics of this kind of bridge.Takingthe high-speed railway three span prestressed concrete continuous bridge with variable cross-section as the research background,the finite element software MIDAS/CIVIL is used to establish a spatial finite element model of the full bridge.Then,the stress and deformation of the bridge during the construction and operation stage are calculated and analyzed,and checked according to the code.Furthermore,different depth-span ratio models are established for the fulcrum and mid-span of the main beam respectively,and the mechanical characteristics of the bridge under dead and live loads are calculated and analyzed.Based on the calculation results,the change rule of the depth-span ratio and internal force,stress and displacement of the high-speed railway prestressed concrete continuous bridge are summarized,and the reasonable range of the depth-span ratio of the high-speed railway prestressed concrete continuous bridge is obtained.