Reasonable Structural Design And Mechanical Characteristics Analysis Of Deck Concrete Filled Steel Tubular Arch Bridge

Concrete-filled steel tube arch bridge has the characteristics of high bearing capacity,fast construction speed,strong spanning ability,strong foundation adaptability,and beautiful structure.The Guankou Bridge belongs to the new road project from Zhenxiong to Guozhu Railway Station to Dawan Highway.The preliminary design of the bridge is intended to be a through-type concrete-filled steel tube arch bridge.In order to meet the project design and scientific research requirements,based on the calculation theory and structural design selection requirements of the CFST arch bridge,the structural design parameters of the bridge were preliminarily formulated and the initial structural finite element model was established.Based on the initial structural design,the reasonable structural design parameters of the Guankou Bridge,the construction sequence of the internally-filled concrete,the static characteristics of the construction and operation phases,the dynamic characteristics of the bare arch and the completed bridge,and the stability of the completed bridge are analyzed and studied,and the main completion The following work:1.Summarized the design theory,structural selection principle and numerical simulation method of concrete-filled steel tube arch bridge.2.Based on the initial structural model,from the five aspects of arch axis coefficient,arch rib beam height,arch rib upper and lower chord steel pipe wall thickness,horizontal joint arrangement,and column arrangement,the finite element rational parameter analysis of the structure is carried out to clarify the existence of structural design Related issues lay the foundation for the improvement and optimization of the final structural design parameters.3.The study determined the construction method of concrete pouring in the pipe of the Guankou Bridge,and analyzed the influence of the order of pipe pouring on the stress of the arch rib steel pipe,the deformation of the arch ring and the overall stability of the bridge,and obtained a reasonable concrete pouring process in the pipe.4.Based on the relevant reasonable structural parameters and analysis results of the pouring process,the initial structural parameters are adjusted,the structural parameters are re-determined,and the finite element model of the Guankou Bridge is established.The static analysis of the construction stage and operation stage of the Guankou Bridge was carried out,and the rationality of the structure was judged using the limit state method and the allowable stress method.5.The article analyzes the power and stability of the Guankou Bridge.Research on the dynamic characteristics of the bare arch and the dynamic characteristics of the bridge-building stage leads to the vibration form of the structure duri ng the construction stage and the bridge-building stage;The structure was subjected to response spectrum seismic analysis,and it was determined that all components of the bridge were in elastic working condition;The structure was analyzed for elastic stability during the construction phase and the bridge-building phase,and the corresponding instability modes and instability forms were obtained,and the influence of loading mode,initial geometric defects and lateral forces on stability was analyzed.