3.2 BIM WORKFLOW PROCESS

3.2.1 BIM Workflow Summary

a.     Design Phase

1.     Architect shall assign a Lead BIM Facilitator to coordinate BIM workflow per section 3.4 of LACCD BIM Standards.

2.     Designers shall use trade specific analytic and authoring tools to create 3D models to meet predefined project requirements.

3.     For Spatial Coordination, BIM Facilitator will integrate the design discipline and trade specific models into a consolidated 3D-model using coordination software (i.e. Navisworks, Bentley Navigator). The consolidated model will be used for assembling the various design models and providing a report and view list of design coordination issues.

4.     Resolution of Spatial Conflicts: During coordination meetings, the Design Team will electronically identify, track and publish interference reports between all trades. All interferences will be resolved interactively by the design team facilitated with the use of coordination software.

5.     Prior to each scheduled coordination meeting, an updated clash report will be issued by Project Team BIM Facilitator to track the progress of coordination, analyze conflicts and help facilitate issue resolution prior to construction.

6.     Spatial Coordination Sign-off Drawings: Once all spatial conflicts have been resolved by the design team and the structural, architectural, MEP, and Civil systems have been fully coordinated, each consultant shall provide fully annotated drawings of their respective systems in PDF format for submission to the Architect / Engineer of Record for review and approval. The fully coordinated model shall be used as reference model for the construction team to coordinate compliance of fabrication models with design intent, and shall be updated in a timely manner to reflect design changes in the field.

7.     Building Performance and Energy Modeling – Design Team shall regularly update energy models using BIM Data as reference. Information generated from Design Energy models shall be integrated into design models as appropriate to achieve building performance and energy efficiency goals of the project.

8.     DSA Review and use of digital models for approval will be developed in collaboration with DSA by LACCD.

b.    Bidding Phase

1.     As part of documents delivered to potential bidders, Design Team shall provide non-editable version of the coordinated BIM for reference and visualization of the building.

2.     After Contract is awarded, the coordinated Design BIM and all native BIM files will be provided to the General Contractor.

c.     Construction Phase

1.     Prior to the start of construction, Contractor shall assign a Team BIM Facilitator to coordinate fabrication models with coordinated design model. If acceptable to the Contractor and Design Team, Contractor may request Team BIM Facilitator be the same individual assigned in the Design Phase.

2.     Construction Trades noted in Section 3.2.4.c shall generate fabrication models using Design Team BIMs that have been issued for construction.

3.     Contractor’s Fabrication models shall be coordinated with the design model. Any conflicts to the design model that need to be made prior fabrication and construction shall be reported to Design Team in the form of an RFI. Clash reports may also be issued by General Contractor as background information for RFI’s and submittals.

4.     As part of the requirement for record delieverables Contractor shall continually update the Construction Record BIMs with as-built conditions. Concurrently, Design Team shall update Design Record BIMs with documented design changes in the field.

3.2.2 Project Team Collaboration Procedures

The success of a BIM enabled project delivery process is highly dependent upon the level at which the entire project team can communicate and work collaboratively for the duration of the project. This section documents the recommended collaboration procedures for effectively managing this process.

a.     Shared File Server - Prior to start of design,it is required that Design Team establish a single shared project server for the upload and exchange of digital models, and the collection of project deliverables at pre-determined milestones. The same shared server shall continue to be used for the same purposes during Construction. Models on this shared server will be fully accessible web based to all team members via assigned site user names and passwords. If a LACCD provided shared file server is available, Project Team shall coordinate with the District to establish access.

1.     Upload Models to Shared Project Server - During the Design Phases, design engineers and architects will upload their trade specific authoring and analysis models to the shared Project Server for scheduled coordination meetings and milestone submittals.

2.     Design Models uploaded for clash detection and systems coordination should be saved in an optimal interoperable format agreed upon by project team. (i.e. Navisworks accepts several file types but dwg, nwd/nwc, and ifc are file formats that are operable across multiple software platforms)

b.    Coordinated Insertion Point – Prior to the start of design in BIMs, BIM Facilitator shall work with project team to establish a geospatially coordinated insertion point for all discplines to begin their models. See Section 2.4.5 of BIMS and Section 8.0 of CAD Standards for additional information on how to establish insertion points.

c.     Points of Reference – The BIM facilitator will 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. If room information is easily translatable to the coordination model, this should also be incorporated.

d.    Project Kickoff BIM Standards Orientation – Upon award of the project to the Project Team, LACCD shall facilitate a BIM Standards Kickoff Orientation with the Design Team to review the following:

1.     LACCD BIM Standards and Workflow process

2.     Statement of Owner’s Project Requirements

3.     All data developed during the project validation phase

4.     Project Model Template (aka dataset)

During Bidding, use of BIM Standards will also be announced to potential bidders, and then reviewed with selected General Contractor prior to the start of construction.

e.     Third party involvement - The Project Team is encouraged to seek involvement of selected third parties, such as building officials, local utility companies and other stakeholders that may benefit from a visual review of the coordination model

3.2.3 BIM Collaboration Room (“BIM Theater”)

During the Design Phases, the Design Team Prime Consultant will provide a room (BIM Theater) for facilitating BIM Collaboration. The BIM Theater shall serve as a collaborative work environment for design review and coordination. Alternately, collaboration using web conference (i.e. WebEx, GoToMeeting) is acceptable for facilitating these meetings.

During Construction, Contractor will provide and set up a BIM Collaboration room located at or near the construction site to coordinate fabrication models with respective trades.

For each BIM Theater, Smart boards may be used to view documentation (2D and 3D), create mark ups interactively, archive the latter, convert them to RFI’s or other relevant reference documents. 2

3.2.4 Spatial Coordination and Clash Detection

Figure 2 Illustrates the BIM based coordination process during design and construction phases

In addition to Authoring and Analysis tools, specialized coordination software (i.e. Navisworks, Bentley Navigator) will be needed to facilitate spatial coordination and clash detection in a 3D Environment.

a.     3D-Models, Formats and Model Structures
The 3D models shall consist of 3D-Solids (not lines or wire frames) that represent the actual dimensions of the building elements and the equipment that will be installed on the project. In the Design Model, reasonable abstractions can be made (i.e. pipe fittings do not need to be modeled), and shall be coordinated with the Builder to ensure meaningful coordination and clash detection. Before modeling begins, BIM Facilitator will work with team to develop a structure and features of the files that are to be submitted (Documents: File Structure, Modeling Scope Matrix). Typcially, BIM Coordination requires the following model structure and features:

1.     Project team shall follow LACCD File Naming requirements as documented in LACCD CAD Standards “Section 3.0 File Naming Guidelines”

2.     One file for each floor (or zone) of one floor and trade (e.g. 4 floors, 2 wings per floor, and 5 trades => 40 files)

3.     For MEP trades, the 3D representations of each floor may be relative to a 0’-0” FFL as long as all MEP trades agree on the same protocol. The BIM facilitator will adjust the elevations of the architectural and structural elements to 0’0”.

4.     All other trades will be modeled at the correct elevation (not all floors modeled at the same elevation).

5.     All elements of the building must be represented in only one file and should be modeled by their specific trade. For example, the architectural model provided for 3D coordination should not include any of the structural elements contained in the structural model. Lights should be modeled by the electrical engineer, not the architect.

6.     The architectural ceilings should contain openings for lights, registers, etc. as required.

7.     All models should include separate 3D representations of required clearances and/or access requirements for equipment access, light clearances, overhead cable tray access, etc. These clearance/access models should be in a separate layer(s) for each trade clearly labeled as such.

8.     The granularity of elements in the model has to correspond with the sequence of the installation at the site (e.g. not one wall element for the entire floor).

9.     All 3D model files submitted for clash detection must be “clean” – with any extraneous 2D references and/or 3d elements stripped from the models.

10.  E-mail notifications will be generated automatically by the Server system every time a new file is uploaded.

11.  When emailing notification of file uploads or for any other email correspondence pertaining to this project, all email subject line headings must be prefaced with the acronym for the Project Name.

12.  For ease of identification during the 3D Coordination process, the following trades will be represented in these assigned colors:

Trade colors for Coordination Software

·         Fire Protection: red

·         Plumbing: magenta

·         HVAC Duct: blue

·         HVAC Pipe: lime green

·         Electrical: cyan

·         Pneumatic Tube: dark green

·         Concrete: Grey

·         Structural Steel: maroon

·         Architectural: white

b.    Collaboration in the Installation Planning Process
Prior to installation, Contractor will hold planning meetings with affected subcontractors where the coordinated model will be used to review and optimize field installation. Subcontractors will be expected to have individuals attend who can actively engage in the planning process and make schedule commitments.

c.     Digital Fabrication
The collaborative process will ensure that the deep knowledge and associated efficiencies of the fabricator are embedded into the construction model. As part of the contractor’s submittal, the following construction trades shall provide 3D fabricaton models with parametric model objects:

1.     Structural Steel

2.     Mechanical System Duct

3.     Curtain Wall

4.     Building Envelope Systems (i.e. rain screens, pre-cast panels)

5.     Casework and furniture systems

6.     Any additional fabrication models generated by subcontractor

Note: MEP subcontractors should incorporate vendor models for equipment if available.

d.    Coordination of entire building -BIM Facilitator will assemble a composite model from all of the model parts of each design discipline for the purpose of performing a visual check of the building design for spatial and system coordination. Vertical shafts should also be reviewed to ensure that adequate space has been allocated for all of the vertical mechanical systems and that all of the shafts line up floor to floor.

e.     Coordination, floor by floor - On a multistory project, the models may need be split on a level by level basis for MEP coordination. If a floor is particularly large, it may also need to be split by zones to reduce file size.

1.     Each floor shall be created as a separate level in the coordination software, and all trades shall reference a shared and documented insertion point and methodology for developing these files. Typically, 3D coordination continues single floor until building systems are fully coordinated, and then continues on the next floor up.

f.      Clash detection and reporting

1.     Coordination software will be used for assembling the various design models and for providing a report and view list of design coordination issues. The Design Team, including Team BIM Facilitator and Discipline BIM Lead Modelers, will review the model and the Clash Reports in coordination meetings on a regular (weekly) basis.

2.     The report will be reviewed by the team members and agreed upon solutions will be implemented per an agreed upon schedule. This process will be repeated throughout the design phases until all spatial and system coordination issues have been resolved.

3.     During the construction phase, the Contractor shall utilize the fully coordinated and consolidated design model to verify the accuracy of certain fabrication models (ref. Sec 3.2.4.c). Prior to each fabrication submittal for approval, fabrication contractors shall submit their models to the Contractor’s BIM Facilitator for integration with the Design Model.

4.     Internal Clash Resolution – Design Consultants and Subcontractors who are responsible for multiple scopes of work are expected to coordinate the clashes between those scopes prior to providing those model to the BIM Facilitator for spatial and system coordination.