Study On Management System Of Medium And Short Span Highway Concrete Girder Bridges Based On BIM

Since the 21 st century,BIM technology has developed and applied rapidly worldwide,and it has gradually reflected its value in bridge engineering.Since BIM has the advantages of information integration and visualization,BIM-based bridge management system has become an effective tool of bridge maintenance management.However,most of the current research on BIM-based management systems is aimed at large-span bridges.In fact,medium and short span bridges account for the largest proportion in the road network,among which concrete bridges are the majority.If the BIM-based bridge management system can be established for medium and short span concrete girder bridges,it will have greater advantages Therefore,the BIM-based medium and short span highway concrete girder bridge management system was established in this paper,and the two functional modules of bridge data database and degradation prediction in the system were studied in detail.Firstly,the framework of BIM-based medium and short span highway concrete girder bridge management system was proposed,and the contents of the four major functional modules of the system were analyzed in detail.Then,the establishment of the BIM model of the bridge disease distribution in the core functional modules of the system was studied in depth.To this end,the classification and coding of BIM components and disease coding which is suitable for medium and short span concrete girder bridges are proposed,and the parameterized component library and disease family library of BIM models for medium and short span concrete girder bridges are established.Next,the threedimensional visualization of bridge disease information,the display of disease attribute information,the display of disease history records,the statistics of disease information and other functions were achieved through the establishment of a bridge disease distribution BIM model.The above functions can assist bridge managers to understand the bridge status intuitively and quickly,thereby providing effective assistance for bridge management.Secondly,to reduce the amount of BIM model data so that the BIM model can be applied to the web-side bridge management system quickly and efficiently,a comparative study on the main methods of the lightweight BIM model was carried out.Based on the Autodesk forge platform,the lightweight BIM model and the rendering and display of web page were realized.In addition,in order to efficiently extract the maintenance information data in the BIM model and to provide a data source for the degradation prediction module of the bridge management system,the Forge platform is redeveloped based on the Model Derivative API,and the BIM model data extraction based on the web page was realized through the established application.Finally,in order to accurately predict the degradation trend of bridge technical status,a large amount of bridge detection information accumulated in China Bridge Management System over the years has been used as the data source for building prediction models.The artificial neural network method,linear regression method and Markov method are selected to predict the technical status of medium and short span highway concrete girder bridges.The final prediction results show that the prediction model based on the LSTM algorithm of the artificial neural network method works well in the prediction of the technical condition of the medium and short span concrete girder bridge components,and the degradation prediction model based on Markov chain also has good applicability in the prediction of the technical condition grade of the whole bridge.The established prediction model can accurately predict the changing trend of bridge technical status,and effectively assist bridge maintenance management and maintenance decisions.