| The process of construction monitoring is affected by many factors.In order to ensure the safety of bridge construction and the ideal state of completed bridge,the construction monitoring and BIM are combined.The information and visualization characteristics of BIM are fully utilized.The BIM software is used for parametric modeling.and the construction error is checked in advance through collision inspection,so that the finite element model can be modified in advance.At the same time,the transformation from BIM model to finite element model is studied to make up for the deficiency of BIM model.This thesis takes a steel box girder cable-stayed bridge as the research background,and carries out the following research:(1)The finite element modeling and stress analysis of a steel box girder cable-stayed bridge are carried out.Midas/civil and ANSYS finite element models are used to analyze and compare the stress state of the completed bridge,and the correctness of the model is verified.At the same time,ANSYS model is used to analyze the stress and deformation of the complex part of the tower beam pier consolidation,and its safety is analyzed.(2)Based on the established finite element model,this thesis analyzes the influence of the dead weight of the main beam and the cable force of the cable on the displacement,internal force and cable force of the main beam,and explores the importance of the influence factors on the displacement,internal force and cable force of the bridge according to the influence results,so as to provide a reference for the error adjustment in the construction monitoring process,and also provide a reference for the finite element model modification and optimization through using BIM model.(3)The bridge BIM model is established by supplementing the secondary part of the structure ignored by the finite element model.The visual three-dimensional model of steel box girder cable-stayed bridge is established by using BIM software Revit.The bridge families such as pile foundation,pier,abutment,support,steel box girder,bridge tower and stay cable are established.The BIM model of the whole bridge is established by splicing through three-dimensional coordinates.A large number of data generated from construction monitoring and parameter error analysis are integrated into the BIM model,which is convenient for management.Dynamo plug-in is used to improve the efficiency of BIM modeling.(4)The application of BIM model in improvement of the accuracy of finite element model and the informatization level of construction monitoring is studied.The engineering quantity statistical check function of BIM is used to modify the finite element model,which directly improves the accuracy of the model;The collision checking function of BIM model is used to find out the design problems and modify the design drawings in advance,which indirectly improves the accuracy of finite element model.BIM lightweight model and two-dimensional code combined with BIM model are used to view the monitoring results conveniently.(5)In order to solve the problem of BIM model’s insufficient analysis and calculation ability,the finite element model transformation of BIM model is studied,Dynamo plug-in and python language are used to realize the transformation of the finite element model from the Revit model to the ANSYS model. |
