What is the Definition and Concept of BIM? Many people initially associate BIM with Building Information Modeling because of its modeling capabilities. This is understandable since BIM was first introduced in China primarily as a modeling tool. Let me share my perspective on this.
Building – This term refers broadly to architecture or construction and should encompass all engineering structures, including civil and architectural works. It represents the physical spaces we interact with daily and is categorized based on the technical standards proposed by BIM, which lean heavily toward engineering technology.
Information – This refers to the digital representation of data or behaviors related to engineering structures within physical space, expressed in a “virtual space” through information technology. It is the core of BIM, especially focusing on the integration between geometric and non-geometric information.
Model(ing) – Modeling is a proprietary concept derived from object-oriented technology in IT. Simply put, it means “objectification”: using object-oriented methods to organize the properties (such as cross-sectional dimensions and materials) and behaviors (for example, how beams or columns connect at their ends or criteria determining the presence of walls) of physical objects (like columns) within virtual space.
The focus of BIM is not just the tools.
Nor is it solely about modeling.
The real emphasis of BIM lies in information sharing.
According to Autodesk’s BIM White Paper (2002/02/21):
Building Information Modeling is Autodesk’s strategic approach to applying software and information technology in the construction industry. The solution features three key characteristics:
- Creating and managing collaborative workflows on a shared digital database.
- Managing changes within this comprehensive database, where any change to one part automatically adjusts all related parts.
- Extracting and retaining information for reuse by industry-specific applications.
Other industry perspectives include:
Graphisoft (ArchiCAD): A single resource library that contains both graphic files (such as engineering drawings) and non-graphic files (including specifications, schedules, and other data).
Bentley (MicroStation): A model stored within a unified database management system that integrates both graphical and non-graphical aspects throughout the building lifecycle.
The building information model in BIM is a digital three-dimensional (3D) representation, but it differs from traditional 3D CAD models composed solely of geometric elements like points, lines, and surfaces. Instead, BIM consists of realistic 3D models that combine spatial and attribute data. These models are made up of objectified geometric components corresponding to physical building elements such as beams, columns, slabs, walls, stairs, doors, and windows.
4D BIM adds a timeline to the 3D model’s spatial dimensions (X, Y, Z), enabling dynamic visualization of the construction process in three dimensions. This allows users to simulate and plan the construction schedule in advance.
5D BIM incorporates cost data, giving users a clearer understanding of budget allocation by project phases. BIM software can quantify all construction materials and calculate total costs by associating unit prices, helping users immediately assess how material changes impact overall expenses.
6D BIM enhances energy consumption estimation during the design phase, allowing for accurate measurement and verification during construction. It also supports process improvement through parameter calibration based on collected data.
7D BIM focuses on facility and equipment operation and maintenance. It provides detailed information such as item specifications, dimensions, materials, applicable standards, operating procedures, maintenance schedules, and inspection records. By tracking this data, users can evaluate reliability, estimate service life, and develop appropriate repair, update, and inventory strategies. It also supports creating environmental and performance models based on operational history.
That covers the definition and concept of BIM. I hope this article has been helpful!
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