基于OSG的BIM+GIS在桥涵方案设计中的应用研究

Research on Application of Bridge Scheme Design with BIM+GIS Based on OSG

结合GIS信息开展桥梁方案BIM设计,是桥梁数字化智能化发展的必然产物。只关注桥梁结构自身的BIM,必须与GIS相结合,才能达到信息全面、定位统一的目标。结合桥梁方案BIM设计特点,以及GIS信息来源多样和海量数据的特有情况,基于OSG三维渲染引擎,开发了桥梁BIM与GIS融合平台,解决了BIM模型与GIS场景融合时坐标统一和模型协调问题,搭建了BIM+GIS的可视化桥梁方案设计系统,实现了桥梁方案设计与工点地形模型相结合,更直观、更全面地表达设计意图。研究表明:该设计系统支持倾斜摄影、激光点云、数字高程模型等GIS数据,支持参数化自动创建桥梁BIM模型,并可通过step、iges、ifc等开放格式导入难以参数化的特殊桥梁的BIM模型文件,实现桥梁方案可视化协同设计。

BIM design of bridge scheme combined with GIS information is the inevitable product of the development of digital and intelligent bridge.BIM,which only focuses on the bridge structure itself,must be combined with GIS in order to achieve comprehensive information and unified positioning.Combined with the characteristics of BIM design of bridge scheme,the diversity of GIS information sources and the unique situation of massive data,this paper develops the bridge BIM and GIS fusion platform based on OSG 3 D rendering engine,solves the problems of coordinate unification and model coordination during the fusion of BIM model and GIS scene,and builds a visual bridge scheme design system of BIM+GIS.The combination of bridge scheme design with construction site terrain model is realized to express the design intention more intuitively and comprehensively.The research shows that the design system supports GIS data such as tilt photography,laser point cloud and digital elevation model,assists parameterized automatic creation of bridge BIM model,and fulfills visual collaborative design of bridge scheme by importing BIM model files of special bridges that are difficult to parameterize through such open formats as STEP,IGES and IFC.