Abstract
Computer Aided Design (CAD) systems play an important role in the production of building designs that are used to assist building constructions. Thus, CAD building drawings contain a large amount of building data important for indoor navigation and other related analysis which are often done in BIM (Building Information Modeling). Therefore, the conversion of CAD-based building data to BIM is necessary to make the data in CAD useful for these applications. However, when mapping to the BIM model, there are semantic ambiguities which will have an important impact on the subsequent analysis of the information converted from CAD. This paper addresses these ambiguity problems by first examining the building information represented in CAD drawings and the mapping relationships between the building information in CAD drawings and that in BIM. Once these relationships are established, the semantic ambiguities existed in the mapping were identified and then corresponding constraints were developed to address these ambiguities. The experiment results show that the approach described in this paper can effectively eliminate the semantic ambiguity of the mapping from CAD to BIM and the converted BIM model can effectively support subsequent analysis.
Highlights
Before the emergence of BIM (Building Information Modeling), the traditional construction industry lacked a unified standard for information exchange
The core problem to be solved is the semantic ambiguity in the conversion of the building information from building Computer Aided Design (CAD) drawings to IFC model
The reason for this problem lies in the fact that there are multiple realizations of the same building information in building CAD drawings when transforming to IFC due to multiple possible mappings
Summary
Before the emergence of BIM (Building Information Modeling), the traditional construction industry lacked a unified standard for information exchange. It should be noted that the constraints proposed in this paper is to limit the conversion of the building information from building CAD drawings to IFC model, so as to solve the problem of semantic ambiguity. D. ANALYSIS OF SEMANTIC AMBIGUITY Section 2.3 initially constructed the mapping of building objects, building relationships involved in building CAD drawings to the related objects in IFC (Fig. 4, Fig. 5, and Fig. 9). Considering the above problems and combining with the practice of masonry construction, this paper uniformly adopts following constraints on the problem of wall segmentation of connected walls to limit the relationship of connected walls (Fig. 17): Constrain 7, the following method is used to determine the connection geometry in the connection relationship of wall (i) First, calculate the original section of each wall independently based on the centerline and left and right width information;. This method removes the geometric exception of the connected walls, but more importantly, maintains a high degree of consistency with the wall construction practice, and can better reproduce the complex overlapping relationship between connected walls
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