Analysis Of Calculation On The Rib-hoisting Process And Dynamic Of Long-span Deck Steel Arch Bridge

With the development of bridge engineering technologies, steel arch bridges become the most popular bridge type in long span bridges because of their beautiful shapes and strong impression to people.Based on Daning River Bridge under construction in Chongqing, This thesis focuses on simulation ananlysis of the Rib-hoisting,natural vibration frequency analysis of the structure in finished phase,transient dynamic analysis of uniform velocity moving load and inpact load.This thesis has dealt with the following respects.â‘ Based on geometry and material properties of structure components in designed drawings, the thesis discusses the simulations of structure components, mass and boundary conditions in the model and three-dimensional finite-element model is founded .â‘¡This theis changes forward analysis on the simulation analysis of Daning River bridge in finished phase,and activation and passivation technology is intraduced in the course of modeling.Finally,it abtains displacement of the main dominate nodes,initial forces of temporary cable and the cable forces of all construction phases,proving cantilever construction is feasible.â‘¢Daning River bridge dynamic analysis.This thesis analyses the natural vibration frequency of the structure in finished phase,and the influence of the arch stiffness,supported conditions and deck plank on the natural vibration frequency.Then,velocity moving load is predigested a convergence force on the deck plank center,progressing dynamic analysis of uniform velocity moving load and transient dynamic analysis of inpact load.Dynamic analysis of uniform velocity moving load indicate that with the speed of the moving load increasing ,the arch displacement and inner magnified factor also increase.The transient dynamic analysis of inpact load on the middle span and the fourth span indicate that when the phenomenon that uneven bridge floor causes vehicle jumping is unfavorable for the deformation and inner forces of the structure.So we must have enough recognition when we design the bridge.