Static And Dynamic Analysis Of Long-span Double-tower Steel Truss Railway Cable-Stayed Bridge

Because of its unique shape and large spanning capacity,cable-stayed bridges are widely used in railway bridge construction.Among them,the steel truss railway cablestayed bridge has many advantages in railway bridges due to its advantages of convenient construction and high bending rigidity.In this paper,a large-span double-tower steel truss railway cable-stayed bridge under construction is used as the engineering background.The large-scale general finite element calculation and analysis software MIDAS/Civil2019 is used to establish the cable-stayed bridge model,and the static and dynamic calculation of the bridge is carried out.The research content of this paper has the following aspects:(1)The structural system and development of cable-stayed bridges are introduced,and the current research status of static-dynamic analysis of cable-stayed bridges is summarized.(2)The basic principles and methods of static analysis of cable-stayed bridges are summarized,including the determination of reasonable construction state,the theory of formal assembly iterative analysis,the principle of reasonable bridged state of cable-stayed bridge,and the principle of minimum bending strain energy.In addition,according to the principle of dynamic analysis of cable-stayed bridge,the calculation method of natural vibration characteristics of cable-stayed bridge is introduced.The concept of time-course response analysis method and seismic wave selection time-frequency transformation are also summarized.(3)The engineering background and design parameters of the bridge are introduced.According to the principle of finite element modeling and the simulation method of each component,the calculation analysis model is established by software MIDAS/Civil2019.(4)Using the regression calculation model to calculate and analyze the guide beam and the main beam in the jacking construction stage,and use the formal iteration method to statically analyze the main beam,the cable tower and the stay cable in the suspension construction stage,and The load combination analysis of the cable-stayed bridge during the operation phase is carried out to check the deformation and stress of each structure of the cable-stayed bridge under the load combination.(5)The self-vibration period and mode of the bridge are obtained by subspace iteration method.The seismic response of the bridge is calculated by time-history analysis method,and the influence of traveling wave effect on the seismic response of the cable-stayed bridge is further analyzed.By optimizing the rubber diameter and lead core diameter of the lead rubber bearing,the bearing parameters suitable for the cable-stayed bridge are obtained.