Analysis Of Dynamic Characteristics And Stability Of Construction Process Of Steel Box Tied Arch Bridge

In recent years,steel box tied arch bridges have gradually become one of the bridge types commonly used in urban bridges and scenic areas in China due to their advantages of large span capacity,beautiful appearance and small traffic interference.This paper takes a cross-sea bridge project in Dalian as the engineering background,and uses the large-scale finite element software Midas Civil/2017 to establish a model to study the dynamic characteristics and stability of construction process of the steel box tied arch bridge.The main research contents and research results are as follows:(1)A brief description of the type and development of the arch bridge,the development history of the steel box tied arch bridge at home and abroad,the structure type of the steel box tied arch bridge,the characteristics of the structure,the research status of the stability and dynamic characteristics of the arch bridge,and the research significance of the subject are expounded.(2)The basic theory of arch bridge calculation is introduced,and the finite element model of full bridge space system is established by using finite element Midas Civil/2017 analysis software,and the numerical changes of stress and bending moment of the model under different load combinations are calculated and analyzed.(3)The natural vibration characteristics of steel box arch ribbed arch bridge are calculated,and the natural vibration frequency and vibration mode are obtained,and the influence of different influencing factors on the natural vibration characteristics of steel box tied arch bridge is studied.The influence of the natural vibration frequency and vibration mode of the box tied arch bridge,the arrangement of the transverse braces and the influence of the transverse bracing on the natural vibration characteristics of the arch bridge,and the influence of different arch rib inclination angles on the natural vibration characteristics of the arch bridge.(4)The finite element model of the buckle tower was established to analyze the stability of the buckle tower during the construction of the steel arch ribbed arch bridge.The effects of different buckle stiffness,tower stiffness and wind load on the stability of the buckle tower were studied.Analyze and compare the variation of different parameter changes on the stability of the tower.(5)The principle,purpose,content and importance of construction monitoring are briefly introduced.The field monitoring results are compared with the finite element simulation results to verify the correctness and rationality of the space bar model established in this paper.