Application Of BIM Technology And Finite Element Analysis Of Double Rotating Continuous Beam Construction

With the progress of society and the development of economy,the demand for high-speed railway in our country is also increasing day by day.In view of this,a large number of ballastless track high-speed railways are being built throughout the country,especially a large number of high-speed railway bridges across existing lines.In order not to affect the traffic of the existing lines in the construction stage,most of the high-speed railway bridges are constructed with horizontal rotation technology.At present,although the rotation technology is widely used because of its unique advantages,compared with the ordinary bridge construction,it has the characteristics of high technical requirement and complex construction method.In order to ensure the safety of the rotary bridge construction,and meet the requirements of quality and safety,it is necessary to give correct guidance to the construction of the bridge rotation,and to monitor the stress and deformation of the bridge in time by using the method of combining numerical simulation and monitoring during the construction process.The main research work of this paper are as follows:(1)According to references,the status-of-art of BIM technology at home and abroad is summarized.BIM technology in industry and city's building construction have been well popularized,but the application and research in bridge engineering is not mature enough,especially in the field of bridge construction.In this paper,the application of BIM technology in bridge construction is studied according to the conditions of the bridge engineering.The parametric modeling of the bridge is carried out by using Revit software,and the whole model of the bridge is built according to the actual requirements of the project.The BIM technology is used to carry on the three-dimensional technical intersection of the engineering construction,and the collision detection between the vibration pipe and the prestressed pipe.According to the result of the collision,the position of the concrete vibrating pipe is adjusted in advance.The BIM5 D management platform is introduced.In order to improve the quality and efficiency of bridge construction,the construction schedule,quality and safety of the bridge project are managed,and the problems found in the construction are counted and dealt with in time.(2)MIDAS/Civil and ANSYS are used to simulate the beam segments and the spherical hinge part of the bridge respectively.The stress and deflection of the beam section in each construction stage are measured,and the stress and deformation values of the ball hinge under the maximum stress state are obtained.There are the results.During the construction process,the maximum deflection height of the beam section is 28.96 mm.After the operation of the bridge,the deflection on the beam section is 15.38 mm,and the maximum compressive stress of the main girder of the whole bridge is less than 32.4MPa,which meets the design requirements.The maximum compressive stress of the ball hinge sliding surface is 49.05 MPa,which is less than 70 MPa of the design compressive strength of the MGB slide plate,and the maximum compressive stress is 29.54 MPa < 32.4 MPa.The vertical deformation of the rotating structure under the maximum vertical load is 0.22 mm,which is negligible.Through the numerical simulation of the main beam and the ball hinge,it provides a strong data support for the bridge construction,and has great reference value.(3)The advantages and disadvantages of FLAC3 D are introduced,and the combined method of Revit-ANSYS-FLAC3 D is studied in view of the weak modeling function of FLAC3 D.FLAC3D is used to simulate the variation of settlement in each construction stage of the bridge before the bridge rotation,and the deformation and the influence of the main beam on the pile foundation during the rotation process are analyzed quantitatively.The final settlement value of pile foundation calculated by simulation is 11.976 mm < 30 mm,which meets the requirement of code.(4)This paper introduces the monitoring work of beam segment linearity,beam section stress,rotating structure and pile foundation settlement in detail,records the measured data in time,analyze the causes of the differences,and compares with the theoretical data to provide reliable guarantee for bridge construction control.