Intelligent Strenthening Of Prestressed Beam Bridge Based On BIM

As a key part of the road system,the bridge holds the pulse of the city,and the strenthening and maintenance of bridges are playing a more important role in ensuring the operation of the city.For the service period of reinforced bridge,there are problems such as single monitoring method,lack of scientific evaluation,and inconvenient visual inspection.Using intelligent strenthening components can achieve the dual purposes of strenthening and monitoring.This paper designs strenthening scheme of prestressed beam bridge based on Revit,and OFBG-CFRP intelligent plates are used to monitor the bridge in real time,evaluating the performance of the reinforced bridge based on monitoring data.BIM software can provide multi-dimensional visual data management for the bridge model.With the application of assessment,a digital platform is established for the strenthening and maintenance of bridges,and collection,integration,expression,analysis and evaluation of bridge monitoring data are integrated to promote the informationization of bridge projects.The paper uses prestressed concrete box girders as an example to study the key points of application of BIM technology in the intelligent strenthening and evaluation of prestressed beam bridges.The main contents include:(1)Relied on the strenthening of the bridge at Dayaowan in Dalian,a reinforced bridge model was established by means of parameterization and adaptive modeling in Revit.According to the transformation process of Revit geometry model and Midas Civil structural model,the model transformation of the reinforced bridge in Dayaowan is carried out.The results of the load capacity limit state checking and the normal use limit state checking of the proposed beam bridge are obtained,and the strenthening and measurement point layout scheme are determined.In the Revit,the properties of the various components of the bridge are defined to create the basic information carrier for the smart component is created.At the same time,the intelligent component is used to collect the monitoring information during the bridge strenthening,which can be used to build a model of the Dayaowan bridge based on BIM.(2)The Revit platform API is used for secondary development of the software.The interface design and background code compilation are performed according to the development process,and five functions are provided:automatic update,point search,information query,file export,and additional functions.The feasibility and human-computer interaction of the integration plug-in based on Revit's monitoring information was verified with the example of Dayaowan Bridge for engineering purposes,and monitoring data was integrated and stored.(3)The strain of the OFBG-CFRP plate during the tension stage,anchorage stage of strenthening construction,and later was monitored,and the prestress loss analysis was performed.A simulation method for effective prestress effect of CFRP plates based on real-time monitoring data was proposed and the normal use limit state checking under effective prestress at a certain moment was obtained by Midas Civil.The normal use index ?_? was defined as the ratio of actual deflection and allowable deflection of reinforced bridge under effective prestress,and the evaluation of the reinforced bridge is according to the normal use index and beam bottom stress.Using the Revit platform API for secondary development,real-time performance evaluation of the BIM model is presented,which provides a scientific basis for intelligent decision making and real-time user interaction with the system.