The BIM system is a cutting-edge technology and concept that has gained significant attention in the construction industry in recent years. While it has rapidly developed in China, many people are still not very familiar with it. Today, I will introduce the basic concepts of the BIM system and explore its value.
1. Basic Theory of the BIM System
After years of development, today’s BIM has evolved far beyond its original focus on “modeling.” It has transformed into a comprehensive “management” system. BIM is not just a digital building information model; it integrates both geometric and non-geometric information to effectively construct and maintain facilities, including civil, architectural, and road infrastructure. Moreover, BIM covers the entire lifecycle of a facility—from planning and design to construction, maintenance, and finally dismantling and recycling.
According to the National BIM Standards (NBIMS) in the United States, BIM can be understood in three ways: (1) as a product—a visual, digital building model; (2) as a behavior—the integration of geometric and non-geometric data; and (3) as a system—applications and management tools developed throughout the flow of information.
2. Origins of the BIM System
The concept of BIM was first advocated by Graphisoft in 1987 with their software ArchiCAD. They introduced the idea of “Virtual Building,” which refers to constructing buildings on a computer that correspond to real-world physical objects.
Later, other software companies adopted similar ideas with different terms. Bentley Systems called it the “Integrated Project Model,” while Autodesk (known for AutoCAD) and VectorWorks, influenced by Autodesk’s Vice President Phil Bernstein, popularized the term “Building Information Modeling” to describe the concept.
3. The Value of the BIM System
As mentioned earlier, BIM has evolved beyond the initial “Virtual Building” concept. With advances in software and hardware, BIM has become a fundamental tool in Integrated Project Delivery (IPD) in construction, bringing about four key transformations:
(1) Expanding Industry Integration
From a broad perspective, the BIM system produces a digital 3D database unique to each building that records detailed information at every stage of its lifecycle: planning, design, construction, maintenance, and dismantling/recycling. If a building were a person, this 3D database would be like an autobiography—not just an ID card—documenting all people, events, objects, and their interrelationships throughout its “life.”
(2) Information Integration
Within this framework, each building component is no longer just a labeled object but carries a full story. For example, a steel beam in a building, when represented in the 3D database, not only shows its material and dimensions (as traditional CAD does) but also links to extensive related information: raw material sources, manufacturers, processing and production locations, processing records, transportation details, site signing, storage, and installation data.
Furthermore, during renovations, this information facilitates quick calculations—such as whether the beam can support additional loads from new equipment or if reinforcement is necessary. It also aids in material classification, estimating quantities, and optimizing recycling and disposal processes.
(3) Process Transformation
BIM fundamentally changes workflows in construction projects, which involve diverse participants such as engineers, appraisers, interior designers, project editors, manufacturers, and contractors. Traditionally, complex information was handled step-by-step in a linear workflow to minimize risks of rework and data omission. Progress to the next phase only occurred after finalizing the previous one.
With BIM, all disciplines centralize their information within a shared database, enabling timely, synchronized access to different data from the same model. Since information is embedded directly in the objects, changes to one part automatically update related data. By overcoming process bottlenecks, BIM shifts critical decision-making earlier in the project timeline, accelerating overall progress and reducing cost variability during crucial pre-operation phases.
(4) Integration and Improvement of Work Surfaces
BIM’s visual, centralized, diverse, and interconnected nature is highly practical. The 3D model can easily identify design conflicts, such as clashes or insufficient clearances among beams, columns, and pipelines. It can also simulate dynamic conditions, like water pipe pressure variations or electrical load balance.
By detecting and resolving design errors before construction begins, BIM helps prevent delays and cost overruns caused by last-minute changes.
In summary, these are the basic concepts and value of the BIM system. I hope this article has provided helpful insights into this transformative technology!
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