Stress Analysis Of Steel Box Arch Composite Girder Bridge In Triangle Area Based On BIM

With the advent of the information age,the development and research of digitalization and big data industry has gradually become the hot direction of all walks of life,and the combined application of BIM technology is also gradually developing in the field of bridge.With the gradual development of modern railway network,the traffic pressure brought by it has become a factor that must be considered in bridge construction.This problem can be effectively alleviated by means of rotating construction of cross-railway bridge.BIM model creation and finite element calculation can be carried out according to the structural characteristics of the trans-iron rotary bridge,and BIM technology can be combined to implement visual earlywarning construction monitoring.Achieve the digital twin of the actual project object,and effectively escort the safety production of the actual project.This paper takes Marlboro Bridge in Yongxiu County,Jiujiang City as the background and combines BIM technology to study its monitoring technology.The specific research work and contents are as follows:(1)The full-bridge information model of Marlboro Bridge in Yongxiu County was created by Revit modeling software,and the modeling process was introduced in detail.The bridge family library was built according to the superstructure,substructure and rotary system,and a parameterized modeling method was proposed for the single box and five-room box girder segment in the superstructure.The geometric dimensions of each section and the length of the beam section of the box girder are saved as shared parameters to quickly create the beam section.(2)3D modeling of the geographical environment around the proj ect is carried out by using the tilt photography technology of UAV.The tilt photography geographical model is innovatively combined with the BIM model of the cross-rail bridge.The obstacles affecting the construction in the process of bridge rotation have been inspected and technical support can be provided to the construction unit to provide model support for the intelligent site and later operation and maintenance.(3)Midas/Civil software was used to conduct finite element simulation analysis of Marlboro Bridge in Yongxiu County.According to the construction characteristics,the finite element simulation analysis is carried out for each key construction stage of the box girder,and the theoretical force and linear results are obtained.According to the calculation results,the theoretical support is provided for the subsequent construction monitoring.(4)Participate in the preparation of the construction monitoring scheme of the short-tower cable-stayed rotary bridge,and represent the stress and linear measuring points in the BIM three-dimensional model and code them,so that the monitoring personnel can accurately grasp the spatial position of the monitoring points.By making the construction monitoring simulation animation,the monitoring unit can accurately grasp the monitoring technology of this project.The visual monitoring platform of Marlboro Bridge was built together with all the research groups to better realize the coordination of all units in the process of project progress.(5)Based on the finite element stress simulation results,the stress,linear shape and cable force of the box girder segment in each construction stage were compared with the simulated value and the design value,and the conclusion was finally drawn that the bridge construction process is safe and reliable.