Simulation Calculation Analysis Of Long-Span Continuous Rigid-fame Arch Bridge

With the development of science and technology,bridge-building technology has been rapidly improved.Combination of prestressed concrete girder bridge applying concrete-filled steel tubular structure to the bridge structure arch is a new development in bridge construction technology,which is a combination structure form and work together with the properties of steel's pull-resistant and concrete's resistance to pressure.In this paper,basing on a new Guangzhou-Zhuhai intercity rail track Siu Lam waterway traffic engineering,the combination of the bridge is a new bridge system of the rigid connection of arch and rigid frame and sharing loading, which is the first using in domestic passenger traffic structure and which is also the largest bridge span in domestic passenger traffic line and even the world's high-speed railway line.It's particularly important to choose a reasonable construction of the program,because of the high content of new technologies and the difficulty in techniques and construction.At the same time,considering of the great axial force and bending moment in steel arch,the stability of the bridge is also an essential factor in design and construction.Therefore,this paper analyses the full-bridge structure for the bridge-type using the finite element method,takes some optimize contrasts in the details of construction,and finally analyses the stability of the completed bridge.In this paper,the study includes:1) The research and summarize of the working principle,classification, development of the arch combination bridge and the analysis of the working mechanism of Concrete-filled steel tube and constitutive relationship;Description of the deflection theory of the long-span arch bridge and the basic theory of finite element spatial analysis;2) Discussion in detail of all the modeling processes of full-bridge model establishment by using of the finite element program MIDAS/CIVIL basing on the Siu Lam waterways Bridge project,including the analog of the various components and shrinkage and the simulation of creep and so on;Focus on the analysis of the characteristics of stress and deformation of static analysis of the bridge,deserving the characteristics of the force system of this combination of rigid-frame arch bridge;3) Building the construction phases for the models and making optimization for construction process in details,that is to say,taking the best optimum program by comparing the results among some different construction process;Combination of rigid-frame arch in the bridge construction process,after the first,the symmetry pouring concrete pipe arch of the order of the internal forces reserve the right stress;In the boom tensioning installation,from a cross-foot to the top arch,that is,from the order of symmetry-to-edge installation of tension,is a more reasonable order.It provides such bridge-design theory and practice with program optimization technology.4) Checking computations of the stability of the completed bridge and analysis the impact of load conditions and support boom and others components on the stability of the completed bridge;...