Mechanical Property Analysis Of The Qijia Yellow River Bridge

The deck arch bridges with a beautiful structure,good coordination with the surrounding environment and excellent seismic performance,distributed more and more widely in our country.With the development of economy and science and technology in China,the span of the arch bridge is increasing.If take the material nonlinearity,creep and shrinkage of concrete and the effect of temperature into consideration,the analysis of sufferance force arch bridge will become very complicated.In addition,large span arch bridge requires more complex construction process,higher technical standards,and it is necessary to systematically analyze the construction process and the operational safety,to ensure the safety and stability of the bridge in the construction process.In this paper,we took the Qijia Yellow River bridge as an example,used the finite element software of MIDAS analyze force performance and safety stability of long-span concrete-filled steel tubular arch bridges in different construction stages.In the stage of bridge arch bridge,this paper researched the static performance of the completion of bridge.Besides,we studied the single branch bearing capacity and local stability of lattice column considering temperature load under carrying capacity ultimate state.Meanwhile,we analyzed the force performance of arch structure and local compression of the abutment.We discussed and analyzed the dynamic characteristics and seismic effect of the bridge by using time history analysis and response spectrum method.Finally,the structural buckling analysis is carried out on the different construction stage and operational phase of the bridge.Through calculation show that the bridge structure at various stages in the process of construction,steel tube,stress and displacement and stability of the arch rib concrete can satisfy the requirements of the relevant specification,the bridge into the bridge using phase under various loads,structure satisfies the requirement of safety and applicability,structure under seismic load is safety,therefore,the static and dynamic security research conclusion shows that the Qijia Yellow River bridge design section size,structure and construction measures,the construction scheme is feasible,reasonable structure can meet the construction stage and operation stages into a bridge safety,applicability and durability requirements;Through the cross of the home of the Qijia Yellow River bridge operation stages for static and dynamic analysis,the analysis results show that concrete filled steel tubular arch bridge deck are good in elasticity,plasticity,ductility performance,concrete filled steel tubular arch bridge under the dynamic loads such as earthquake,has high bearing capacity and anti-earthquake ductility,and concrete filled steel tube arch bridge in the construction and the buckling stability of each stage to meet the requirements of the security.