Study On Stress Analysis Of Concrete Filled Steel Tubular Single Tower Cable-stayed Bridge

The concrete-filled steel tube single-tower cable-stayed bridge is an economical and reasonable bridge type in the span range of 100 m and 200 m.The structural system of the consolidated cable-stayed bridge with tower pier beam is relatively large in stiffness and small in deformation,and the main tower position does not need to be supported,so it is easy to meet the requirements of stability.The difficulty of construction lies in that the consolidation area of tower beam pier not only bears the huge axial force and bending moment transmitted by the bridge tower,but also bears the larger axial pressure,bending moment and shear force transmitted by the main beam,and the overall force and structure are very complicated.Moreover,due to the influence of the transverse diaphragm in the beam body,the local stress value of the structure varies greatly,which affects the safety of the structure.In addition,the cable-stayed bridge is subjected to force during the construction process.In order to ensure the quality of construction and the safety of structure,it is very important to select reasonable cable forces which meet the requirements of stress safety and alignment at each stage of construction and after the completion of the bridge in order to ensure the safety of construction and the safety of structure.Based on the project background of Xixian Huaihe Bridge,the whole analysis model of the bar system is established by using the finite element analysis software Midas/Civil,and the static analysis of the superstructure of the main bridge is carried out.Through the analysis of the main beam and the main section of the bridge tower in the construction stage,the stress on the main section of the bridge tower is analyzed.The stress distribution law is summarized.Because of the adjustment of the cable force,the internal force and the linear distribution of the bridge structure will be affected.Using the difference iteration method and the influence matrix method to calculate and determine the beginning of the construction stage Tension,analysis and comparison.According to different construction stages,the initial tension is determined by inversion method,the bridge is analyzed,and the distribution law is summarized.The variation of cable force in this process is analyzed to verify whether it meets the requirements of the code and summarizes the rules.Finally,the local spatial finite element model of the piers and beams of a single-tower cable-stayed bridge is established by using the large-scale general software ANSYS,and the stress distribution in the consolidation zone is analyzed.Select some characteristic points on the section,through the detailed analysis of the transfer and distribution of the spatial stress,verify and guide its local structural design,which has certain reference significance for the design,construction and monitoring.