10. Modeling Requirements
- BIM shall be used for all building systems design, development, and analysis, including but not limited to architectural, structural, mechanical, electrical, plumbing, and fire suppression, etc., as noted in this manual.
- During Concepts, SD and DD Phases, BIM technology shall be used to develop and establish building performance and the basis of design in accordance with VA Standards. The model shall be interoperable with analytic tools including but not limited to building envelope, orientation, daylighting, energy consumption, building management system (BMS), building automation systems (BAS), renewable energy strategies, life cycle cost analysis, and spatial requirements.
- Use BIM authoring software element libraries when creating model objects. Model objects shall contain parts and components as opposed to simple 3D Geometry (e.g., walls, doors, windows, railings, stairs, and furniture, etc.).
- Model objects shall contain IFC parameters and associated data applicable to building system requirements. These elements shall support the analytic process include size, material, location, mounting heights, and system information where applicable. As an example, a light fixture may contain several parameters such as energy output requirements, user illumination levels, make, model, manufacturer, and bulb life.
- The Contractor shall utilize model geometry and extract graphical information for generating construction administration documents from the Project BIM (RFI’s, Directives, Bulletins, and Change Orders, etc). The Contractor shall record as-built conditions in BIM as part of final delivery to VA.
- Submittal drawings, calculations and analysis shall be extracted from the coordinated BIM.
- Elements, objects and equipment shall be tagged with unique identifiers (GUIDs).
Model elements shall be derived from the following sources:
- Manufacturer’s Model Elements - elements created by and acquired from manufacturers often have more information than is prudent to keep in the BIM model; the appropriate level of detail should be retained for the design element. However, embedded performance data shall remain for analysis and specification purposes.
- Custom Created Model Elements—custom model elements that are created must utilize appropriate BIM Authoring tool templates to create custom elements. Custom models components need to be assigned as a part and part of a family or group.
The spatial coordination (coordinates) of the master BIM file shall be set at the beginning of the project. Once established, spatial coordinates shall only be changed by mutual consent of the team and the VA project manager, with the matter recorded in the meeting minutes and the BMP. Once the design coordinate system is agreed upon, any model(s) of existing buildings relevant to the project shall be converted into the coordinate system used for each designed building.
As is standard practice, the VA requires that a building within a BIM file include a geo-reference to accurately locate that building within the site and to give it a physical location context at larger scales. The BIM Manager shall geo-reference site plans and building models for site layout surveying and future GIS use in accordance with the State Plane Coordinate system where the project is located. The BIM file point shall be located at the SW corner of the structural grid.
Figure 1—Model Reference (Ex. Revit)
Figure 2—USGS Datum (Ex. Revit)
The BIM Manager shall provide a 3D grid for incorporation into the spatial coordination model. This will provide the viewer with a quick point of reference when navigating through the model. Room information shall also be incorporated.
- Space information imported from the VA-SEPS-PFD Export shall be the source for space creation in BIM.
- Areas of four square feet or greater shall be tracked and identified by name, even if those spaces are not listed in the VA-SEPS-PFD export.
- Spatial data shall be generated and associated with bounding elements (walls, doors, windows, floors, columns, ceilings).
- The Net Square Footage (NSF) shall be modeled for each functional space in the PFD, using the appropriate space/object BIM tool to capture and carry the information. Spaces shall be represented and broken down into functional spaces (i.e., Medical Exam Room, Laser Treatment Room, Waiting Room, etc.) as defined in the PFD even though they may be parts of a larger physical space. A physical space may contain several areas that are treated individually in the PFD spatial program. If two areas have different functional space classifications, even though they are within the same physical space, they shall be modeled as two separate spaces. For example, there may be a security checkpoint area within a lobby: the security checkpoint area and the remainder of the lobby area shall be modeled as separate non-overlapping spaces. These spaces might also be grouped into a Zone, for visualization and analysis purposes (e.g., to differentiate private vs. public zones, for thermal simulation calculations). Some BIM-authoring applications have several ways to create space objects. Users should consult with the BIM-authoring application vendor to learn the recommended method for creating space objects that will be exported to an IFC BIM.
- Space/area schedules and diagrams must be dynamically updated from the model geometry.
- VA PFD Spatial Requirements must be validated through reports generated from the BIM.
The BIM model(s) shall carry the following information:
- Project ID -
VA Construction Project Number
- Station ID -
- Project Name -
VA Project Name
Each space shall include the following attributes and be maintained throughout the Design and Construction BIM models:
- Space Name—English Name & Abbreviation
- Room Number—VA Wayfinding Room Number
- Room Number—Construction Document Number (used on large complex projects for builder use)
- Space Code—VA-SEPS Room Code
- Unique Space Number—GUID
- Space Type—OmniClass
- Space Type—Uniformat
- Space Measurement—Net Square Footage (NSF),-5- Department Net Square Footage (DNSF), Department Gross Square Footage (DGSF), and Building Gross Square Footage (BGSF)
Each individual piece of medical equipment and building mechanical equipment shall include the following attributes and be maintained throughout the Design and Construction BIM models:
- Item Name—English Name and Abbreviation
- Item Code—VA-SEPS Joint Services Number (JSN)
- Unique Item Number—GUID
- Item Type—OmniClass
- Item Tracking Number—Category Stock Number (CSN) [for medical equipment]
- Blank field for ECRI code or other (to come later)
- Other data available from VA-SEPS that is accommodated by the COBIE spreadsheet and is appropriate to the LoD for the submission phase.
It is VA’s intention to use the BIM model for Facilities Management upon Occupancy. Information that matures during the construction process is to be captured in the appropriate models on an on-going basis throughout the construction phase. The use of these models is a developing methodology, and presently, multiple formats of information are required.
Upon Substantial Completion, BIM files shall be summated to the VA, and shall be cleaned of extraneous “scrap” or “working space” layers, stories, abandoned designs, object creation and testing places, empty layers, and other content which is typically produced in BIM production.
Unless the project acquisition strategy realigns these responsibilities, VA shall receive the following:
3D Geometric Deliverables—Construction Coordination Model
The Contractor shall be responsible for providing VA consolidated as-built Model(s) for all building systems. The Model(s) shall be fully coordinated and align with the Design Model for architecture and structure; the required instructions on file/folder setup shall also be included:
- Contractor—Native file formats of the final consolidated as-built Model(s) for building systems used in the multi-discipline coordination process (version as agreed in BIM Management Plan)
- Contractor—IFC file format of the consolidated building systems models (version as agreed in BIM Management Plan)
3D Geometric Deliverables—Design Intent Model
The Design Team is to ensure that the “Design Intent model” remains current with all approved bulletins for overall scope. It is NOT expected that product specific information will be added to this model. Provide the Model information for architecture and structure and the required instructions on file/folder setup:
- Design Team - Native file format(s) of Design Model (version as agreed in BIM Management Plan)
- Design Team - IFC file format (version as agreed in BIM Management Plan)
- Contractor—Provide COBIE database file containing room and product data information described in previous sections of this document
- Design Team—Provide room/space data in COBIE format to be included in Contractor COBIE database.
- Contractor—Provide As-built drawings in PDF format with fully bookmarked pages.
- Design Team—Produce one printed set of final documents generated
from the Design Intent Model
- In PDF format with fully bookmarked pages.
- DWG format (latest current version) with bound views to each sheet.
All digital deliverables are to be submitted on DVD/CD with the data clearly organized and software version(s) labeled.
Globally Unique Identifier (GUID). GUIDs must be preserved through generation and regeneration of IFC deliverables so that a given object (space, equipment, etc) can be tracked properly. GUIDs are automatically assigned by BIM software. BIM software documentation should be consulted to determine how copied equipment object instances are handled in outputted reports and how they are handled internal to the software.
All spaces, medical equipment, and building equipment and systems shall have an OmniClass code assigned. Use the OmniClass codes provided in the VA-SEPS-PFD Export, or if not in the PFD then apply the appropriate OmniClass designation. Use OmniClass Tables 13, 14, and 23 as appropriate, or consult with the Construction Specifications Institute (CSI) for latest tables that apply.
The area bounded by the inside face of surrounding walls, minus the area bounded by the outside faces of any contained full height column, GSA Building Information Modeling Guide Series: 02—GSA BIM Guide for Spatial Program Validation, v 0.96, (April 2007) §2.1.2