Research On Visualization Of Bridge Structure Health Monitoring Information Based On BIM

With the increasing number of bridges and the increasingly heavy traffic tasks,it poses great challenges for bridge management.Health monitoring has great significance for breaking the barriers to traditional management information,providing strong scientific support for custody,and standardizing and accurately making decisions for supporting custody.However,the monitoring information display method still has the problem of incomplete informationization,and lack of comprehensiveness and intuition.BIM,as a new type of engineering informatization method,has the characteristics of visualization,digitization,precision,comprehensiveness,etc.It penetrates the comprehensive information from survey and design to operation and management and realizes the requirements of full factor and whole life cycle.This paper studies the visual display of various bridge structure health monitoring information in the BIM model and the IFC expression at the data level.The main research points of this article are summarized as follows:(I)The IFC standard system architecture was studied,including IFC standard framework,IFC entity attribute association mechanism,IFC entity information extension mechanism,and IFC standard structure information framework.Through the classification and division of common sensors in bridge structure health monitoring,the bridge health monitoring sensor model is extended based on the expansion of new entities.Based on the existing sensor property set research in IFC,according to the requirements of bridge structure health monitoring information expression,the existing sensor property set is expanded and supplemented.(II)Based on the principle of crack detection in smart grids,crack information is expressed in BIM.Using Revit to establish a fracture information display model,the model was modified to simulate the visual display of crack monitoring information of different parameters.The IFC file parsing tool was used to analyze the IFC file of the fracture model,and the expression mechanism of crack-related parameters such as fracture length,width,and depth in the IFC was analyzed.(III)By establishing a simplified beam model,the feasibility of the structural monitoring deflection information in BIM was verified.By studying the endpoint node extraction,corner extraction and topology reconstruction of the BIM model,a geometric reconstruction mechanism of the BIM model with fusion deflection monitoring information is established.(IV)Taking the slope of the beam as an example,the display and expression of the disease information in the BIM based on the changes in the spatial position of the bridge components,including the inclination of the beam body,the sliding of the beam body,and the abutment settlement are studied.Taking the structural displacement entity Ifc Structural Load Single Displacement in the IFC4 standard as the core,the structural unit,displacement information,and spatial position information association are established.(V)The BIM stress display finite element model was established based on the AFT algorithm and strip method.The RGB model is selected as the stress information color space model,and the color model is divided into regions and quantified to meet the requirements of stress spatial display and IFC expression.Studied the stress finite element solution algorithm for the division of triangle elements and strips,and established the theoretical support for solving the stress in the BIM space model.Finally,based on the structural response entity Ifc Structural Reaction,the stress information is expanded in IFC and visually verified.The preliminary visualization of stress information in the BIM model and the IFC representation have been achieved.