| With the continuous improvement of computer information technology in the construction industry,BIM(Building Information Modeling)technology is increasingly on the agenda.In recent years,the curtail wall engineering is becoming more and more complex and diversited,which puts forward higher requirements for the traditional curtain wall design and construction process.BIM,a method with numerous advantages such as visibility and functional simulation,is introduced into facade engineering gradually.However,Owing to inconformity of documents format of design model and construction model,there is a prominent question in the BIM implementation process of facade engineering from the design stage to the construction stage.The data needs to be re-processed and secondary processing during its transformation.To solve this problem,based on the comparative study of IFC(Industry Foundation Class)standard and STEP(Standard for the Exchange of Product Model Data)standard,this paper establishes the partial mapping relation between them for the common types of curtain wall components such as angle steel,channel steel,joist steel and aluminum alloy profiles,analyses the similarities and differences in geometric expression,studies the extraction and conversion mechanism of geometric information of several component types,proposes the transformation algorithm of the geometric information of the curtain wall components from IFC format to STEP format,and implements the algorithm by using C++ language.Finally,the correctness and feasibility of the algorithm are verified by the actual case of the curtain wall components. |
