As is well known, BIM models encompass various stages: planning, detailed design, construction design, construction, and completion. What considerations should BIM models address at each stage, and what content do they include? Today, we will explore this topic in detail!
1. Conceptual Planning and Basic Design BIM Modeling:
Using on-site analysis, building requirements, and project budgets, BIM systems select design schemes and create 3D models during the basic design phase. This includes site conditions, existing building and pipeline models, architectural design options, structural system plans, and mechanical and electrical system proposals. These BIM models assist decision-makers in evaluating building functions, spatial layouts, structural systems, MEP equipment, materials, construction processes, sustainability, and operations and maintenance.
Key aspects include:
1. Building selection plans involve reviewing local regulations, floor elevations, primary load-bearing structures, wall types, special requirements, construction methods, value engineering, sustainability, cost estimation, and construction feasibility.
2. Structural reviews cover the choice of structural systems, main structural dimensions, spatial needs, equipment load capacities, flow line considerations, requirements for overlapping structures, value engineering, sustainability, and construction feasibility.
3. The electromechanical system review includes the form of HVAC and fire protection systems, pipeline layouts, openings’ positions and sizes, system space requirements, value engineering, sustainability, existing pipeline connections or relocations, construction, and operation and maintenance considerations.
2. Basic Design BIM Model Integration:
At this stage, the design is reviewed to ensure it meets LOD 200 standards and complies with building functionality, requirements, constructability, sustainability, and future operations and maintenance.
3. Model Revision and Transition to Detailed Design:
Following owner team review, the 3D BIM model is revised and prepared for the detailed design phase.
4. Detailed Design BIM Modeling:
Building on the basic design, detailed BIM models are developed based on spatial needs and system-specific requirements. This includes creating building, structural, and MEP detailed design models across initial, mid-term, final, and construction design (IFC) stages to refine and confirm the original design plans.
Considerations at this stage include:
1. Building detailed design models must account for special materials and construction methods, performance software analysis, owner requirements, regulatory reviews, system interfaces, construction details, and accurate material quantity estimations.
2. Structural detailed design models focus on quantities of concrete and steel, special materials and construction methods, owner and regulatory requirements, system interfaces, and construction details.
3. Mechanical and electrical detailed design models address special materials and equipment, owner requirements, regulatory reviews, energy analysis, system interfaces, equipment delivery, operations and maintenance, future scalability, construction, and precise material quantity calculations.
5. Detailed Design BIM Model Integration:
This phase verifies that the design meets LOD 300, ensuring spatial arrangements, functionality, system interfaces, constructability, and clash detection are addressed.
6. Model Revision and Move to Construction Phase:
Following owner team review, the 3D BIM model is updated to fulfill detailed design requirements and proceeds to the construction phase.
7. Construction Design BIM Modeling:
Building on the detailed design BIM models, LOD 350/400 construction models are developed, including structural and MEP construction models, alongside construction plans. Procurement and contracting of outsourced products and equipment that impact delivery timelines can be arranged in advance. Construction models require pre-review of construction flow simulations, material and equipment storage locations, equipment entry schedules, construction sequences, site locations, methods, and work schedules.
8. Construction BIM Model Integration:
This step ensures thorough planning of construction routes, material and equipment storage, equipment entry timing, construction processes, locations, methods, and work schedules.
9. Prefabrication and Fabrication Models:
Based on construction models and vendor data, detailed 3D manufacturing and installation models are created to help the project team understand system component specifics. Prefabricating models in factories enhances construction quality, safety, and productivity. Prior to installing major MEP components, the BIM team and MEP subcontractors must update the BIM model to reflect the current construction status and relevant as-built drawings. Any significant discrepancies between the actual conditions and original design should be reported to the original design team for necessary adjustments.
10. Completion Model:
Using actual on-site conditions, integrate LOD 300/350/400 models and revise them into a final completion model at LOD 500.
That concludes our discussion on what considerations BIM models should address at each stage and their content. I hope this article has been helpful!
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