Analyses Of Operational Stage Performance And Seismic Response Of Steel-box Handle Basket Arch Bridge

This thesis takes a span 152 m steel-box handle basket arch bridge as research object,and makes a static analysis of the bridge.The detailed stress calculation and optimization of steel anchor box structure and lifting lug structure of the connection between cable and arch is carried.The seismic response of the structure is also analysed by the method of response spectrum,linear time history and nonlinear time history.(1)Finite element software MIDAS/CIVIL is adopted to establish the full-bridge analysis model.In this model,cable and tie bar are simulated by truss elements,the other members are simulated bybeam elements.(2)Based on the full-bridge analysis model,the stress,internal force and deformation of the major components under the actions of dead load and other six load combinations are calculated in the stage of bridge operation.(3)Finite element software MIDAS FEA is adopted to build element models of steel anchor box structure and lifting lug structure based on solid elements and shell elements.The detailed stress calculation and optimization of these two structures is carried.(4)The natural vibration characterisitics of the bridge are calculated by using Lanczos method.The seismic response of the structure is analysed by the method of response spectrum,linear time history and nonlinear time history based on boundary nonlinear effects.The thesis makes a contrastive analysis the structural seismic responses under two different boundary conditions.