Introduction to BIM: Unlike the early days in China, where promoting and educating people about BIM was necessary, its widespread adoption today means most individuals have at least a basic understanding of it. This article aims to address common questions and clear up misconceptions for newcomers to the BIM industry.
In our rapidly advancing information technology era, the construction and management of buildings throughout their entire life cycle have seen profound changes. Take design, for example: traditional manual drafting—once time-consuming and labor-intensive—has been largely replaced by computer-aided design (CAD). This shift has streamlined the processes of drawing, modifying, and saving plans. Moreover, with advances in computer hardware and imaging technologies, what was once limited to 2D drawings can now be represented as virtual 3D building models.
In the early stages of CAD, building models mainly captured external appearances and provided limited support for managing the full lifecycle of a building. This limitation meant that additional management of building-related data was necessary. Ideally, integrating data directly into the model and continuously updating it at every phase would enable comprehensive lifecycle management. However, earlier engineering practices relied heavily on drawings and multiple spreadsheets to handle complex project data and scheduling, requiring large teams for coordination and integration.
To improve the classification and management of engineering data, Eastman et al. (1974) proposed describing buildings as assemblies of numerous spatial components. These components were organized and classified by computers based on attributes or categories, using CAD drawings and design data. The International Organization for Standardization (ISO) further facilitated data exchange in engineering by establishing standards. In 1983, the STEP standard (Standard for the Exchange of Product Model Data) was introduced, with ISO-10303-11 defining the EXPRESS language to describe product models, including solid geometry and related attributes.
Later, Eastman et al. (1999) expanded on these concepts in their book Building Product Models, introducing detailed models integrated with data information models. They explained the architectural principles behind information modeling and the STEP data exchange standard. As building components were modeled, their associated attribute data was integrated as well. This combination of models and data gained traction, leading graphic software companies to adopt the concept. For example, Graphisoft’s ArchiCAD introduced the idea of virtual architecture, Bentley’s Microstation promoted the integrated project model, and Autodesk’s Revit popularized BIM as a design concept for the architecture, engineering, and construction (AEC) industries.
Experts agree that CAD alone is insufficient for describing increasingly large and complex design projects. BIM is gradually transforming traditional information technology applications within the engineering sector. Eastman et al. (2011) published the BIM Handbook, which defines BIM, outlines the development of related software tools, and discusses BIM’s framework and concepts throughout the entire building lifecycle. The book includes multiple case studies demonstrating BIM’s practical applications, making it an essential reference for anyone learning about BIM.
BIM represents a 3D building model enriched with detailed information about materials, costs, sources, and other attributes of each component. It supports all stages of the building lifecycle—from planning and design to construction, operation, and even demolition. The spatial data within BIM models can also be leveraged for building energy analysis and creating more energy-efficient, green buildings. Popular BIM software today includes Autodesk’s Revit series, Bentley’s Microstation series, Graphisoft’s ArchiCAD, Trimble’s Tekla, and others.
As BIM software usage expanded, a new challenge emerged: different platforms employed their own data formats, complicating interoperability. To address this, twelve U.S.-based software companies formed a collaborative alliance in 1994, which later evolved into the Advanced Building SMART International Interactive Alliance. This group championed the development of the Industry Foundation Classes (IFC) standard, a universal format for BIM data exchange. In recent years, more software companies have adopted the IFC standard, which continues to develop and improve.
That concludes today’s introduction to BIM. Rather than starting with basic BIM concepts—already well-covered in many articles—I hope this overview has provided valuable insights for everyone.
Must log in before commenting!
Sign Up