BIM (Building Information Modeling) is an object-oriented information model that develops component models containing various parameters based on unified specifications and technical requirements. By representing information and setting parameters, it integrates with other models to form a complete project. Establishing a standardized resource definition through uniform information representation methods across different models is essential. This ensures distortion-free information exchange among various management departments and tools on a shared information platform. Consequently, effectively expressing, transmitting, and communicating information among the diverse professions involved in a project has become a top priority.
Currently, the most authoritative industry technical standards are Industry Foundation Classes (IFC), International Framework for Dictionaries (IFD), and Information Delivery Manual (IDM).
1. IFC Standards
When applying BIM technology, a common data format is necessary to describe object information and related resources. This format must be universally compatible, not limited to a specific software type or category, and all BIM software should adhere to it. Different stakeholders have varying information needs at different project stages, and the model development process is a continuous evolution from simple to complex through gradual accumulation.
Information exchange and collaboration between various BIM software are essential, and the IFC standard was created to fulfill this requirement. As an open information exchange standard, IFC facilitates data sharing between different systems and encompasses information about various building products. It presents data in a model format, effectively overcoming communication barriers between heterogeneous systems. Additionally, IFC supports data management throughout the building lifecycle.
2. IDM Standard
The Information Delivery Manual (IDM) complements the IFC by addressing stage-specific data that IFC alone cannot cover. IDM defines the various stages and roles involved in the building lifecycle, specifying the information required and provided by stakeholders, as well as the methods for software to transmit building models, parameters, and related data.
IDM standardizes information requirements and data transitions at different stages by breaking down the IFC information model. This ensures that all participants clearly and accurately understand and utilize the information exchanged via IFC, maintaining consistent correlations across different construction phases.
By offering a clear and straightforward expression method, IDM guides users effectively. It defines the needs and objectives of each stage, allowing users to easily access key information and achieve their tasks correctly. This significantly enhances the quality of information acquisition, promotes building data sharing, and improves decision-making efficiency.
3. IFD Standards
The International Framework for Dictionaries (IFD) addresses consistency issues in IFC information exchange and requirements by verifying whether the information exchanged via IDM aligns with the required data. Since IFC describes numerous building elements—each containing attributes like material, type, geometric dimensions, and spatial location—IFD assigns a unique identifier (Global Unique Identifier) to each element to prevent misunderstandings among participants from different professional and cultural backgrounds.
By linking each unique identifier to its corresponding names in various languages worldwide, IFD creates a unique concept for each element. It records descriptions from multiple information sources, compiling a comprehensive set of attributes for each element. This approach ensures the accuracy and reliability of data exchanged.
Additionally, natural language often presents challenges: a single concept might have multiple “scientific” or “common” names. For example, the terms “leveling,” “base,” and “scraping” represent the same concept. Conversely, a single term like “window” can refer to different concepts, such as the “window” itself or the “window frame.” To address these ambiguities, IFD uses unique identifiers to precisely represent concepts.
In summary, IFC, IDM, and IFD form the three foundational pillars of BIM. IFC defines the formats for information storage and data transmission; IDM governs information exchange based on the needs of different stakeholders at various stages, updating relevant project members accordingly; and IFD assigns unique identifiers to each conceptual term, facilitating accurate information exchange among participants from diverse backgrounds, professions, languages, and countries. IDM and IFD serve as powerful supplements to IFC. When used together, these standards significantly enhance the reliability of information exchange and the accuracy of data transmission across all project participants, greatly improving communication quality.
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