The four-dimensional building information model, commonly referred to as the 4D model, combines building product models with construction process models. By adding the time dimension to the traditional 3D model, the 4D model integrates both design data and construction schedules. The core concept is to merge design and construction information through information technology, enabling seamless integration of the construction process. Using 4D models allows for simulation and analysis of construction workflows, facilitating effective communication and collaboration among project stakeholders.
Applying 4D information models in managing the progress of large, complex construction projects offers numerous benefits. It enhances project planning and control, enables real-time dynamic monitoring, improves overall project management, and can increase construction efficiency.
The Implementation Approach of 4D Building Information Models
Information system integration generally falls into two categories: data exchange-based integration and integration based on a unified data model. Similarly, there are two primary methods for implementing 4D information models.
The first method involves developing specialized software with focused functionality using compatibility protocols. For example, Autodesk’s Navisworks software integrates with existing 3D models to enable 4D modeling and comprehensive project management. As research into 4D modeling advances, many commercial software solutions have emerged, including Vico Software’s Virtual Construction, Synchro Professional Pi, Innovaya’s Visual Simulation, Bentley’s ProjectWise Navigator V8i, Gehry Technologies’ Digital Project, and Tekla’s Tekla Structures. These tools are increasingly used in project management to simulate construction details and visually display the construction process according to project schedules.
While some of these applications can connect to external scheduling software, their dynamic linking capabilities are limited, hindering real-time interaction and updates. Among these, Navisworks is notable for its ability to import BIM 3D models, conduct thorough analyses, and facilitate communication to help project teams anticipate construction sequences.
Navisworks combines various discipline-specific models created by architects and engineers into a single, synchronized, and optimized information model. It offers features such as file and data integration, photo-realistic visualization, animation, 4D simulation, clash detection, and real-time walkthroughs, supporting the creation of comprehensive four-dimensional building information models.
The second approach to 4D model implementation involves developing software that integrates all 4D functionalities on a specific technology platform, such as traditional CAD or BIM platforms. Currently, most 4D models are built on CAD platforms. However, CAD-based 4D modeling lacks robust 3D capabilities and does not produce a true 3D information model, leading to time-consuming and labor-intensive modeling processes.
In contrast, BIM models, which follow the IFC standard and rely on object-oriented parametric design, can be applied throughout a project’s entire lifecycle. Designers naturally create 3D models as part of their workflow, and BIM software inherently supports the creation and modification of these models. Since BIM focuses on design and construction management, with scheduling as its foundation, 4D models based on BIM offer greater practical value.
A comparison between CAD- and BIM-based 4D information modeling processes highlights these differences. Some BIM software includes built-in 4D functions, but these are often immature and incomplete. For example, Revit Architecture allows users to assign time parameters to objects and visualize different construction stages, but it cannot simulate real-time model progression, limiting its practical application.
Currently, no BIM system fully interacts with project schedules in real time. However, the integration of the time dimension into BIM—resulting in true 4D BIM modeling—promises to eliminate the reliance on third-party software. This advancement will add significant value to projects and better support construction management by enabling integrated engineering information management, which improves project efficiency and information transparency.
Overall, BIM-based 4D modeling represents the future direction of 4D information modeling technology.
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