| With the rapid development of many new technologies,such as computer technology,3S technology(RS GIS GPS),BIM technology and wireless transmission technology,bridge structure health monitoring integrating new technologies and methods is developing towards the direction of diversification,intelligence,precision,clustering and other pluralistic integration.Now bridge construction in our country has paid attention to the stages of bridge maintenance,many major bridge structure health monitoring system is established to ensure the safety of the bridge,but as a result of monitoring factors such as scale and funding,there are still many small and medium-sized Bridges failed to install effective monitoring system or single monitoring method,information data utilization rate is low,can not express how intuitive and so on.Component GIS technology is the combination of component technology and Geographic Information System(GIS).In addition to the original characteristics of GIS,it also has the advantages of small and flexible,cheap,easy to develop and high scalability and expansibility.Building Information Model is a way of Building digital expression can contain projects from start to finish all of the Information data,the data structure(spatial model data,attribute parameter data)is an important data source of 3dgis.BIM technology and the integration of GIS technologgy will make the two complementary advantages,it lays a foundation for visualization and fine management of bridge health monitoring.The main research work of this paper is as follows:(1)The framework system and basic concepts of CityGML standard and IFC standard,which are involved in the combination of GIS technology and BIM technology,are described.Based on GIS and BIM technology,the integrated management platform of bridge health monitoring was established by using GIS software Supermap iObjects.NET9D.The visual display of bridge spatial disease monitoring information in 3D scene is realized.(2)Based on the bridge health monitoring platform,a bridge modeling framework based on Revit family is established.The geometric and physical attribute correlation mechanism of the model in BIM and GIS is analyzed,the theoretical basis of the bridge BIM model combined with SuperMap GIS is expounded,and the expression method of spatial information of the bridge model in the three-dimensional monitoring scene is studied.The 10×40m small box girder bridge model established by this framework is taken as an example to realize the visual display of the spatial disease monitoring information of the bridge in the three-dimensional scene.(3)The platform was actually applied in the monitoring project of Mudanjiang Hongling Viaduct,and was responsible for the visual display and early warning function of its monitoring information.Based on the analysis results of the long-term measured data of temperature,strain and deflection of the Hongling viaduct,a time-varying multiple linear regression fitting model considering seasonal temperature transformation is established to extract and predict the temperature effect in the monitoring indexes,and then a dynamic warning mechanism in the monitoring process is realized. |
