BIM PLANNING New Zealand

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The 2019 New Zealand BIM Handbook includes a number of appendices (approximately 10). An important introduction to the BIM project process is planning its start. Often, decisions made at this early stage define the overall design, construction and building process. In principle, they can affect the full life cycle of a building or line infrastructure (roads, railways, etc.) In Appendix A - New Zealand BIM Manual [2], we can find indications: modeling process planning, quality control planning, model configuration, handover and replacement procedures model and guidelines for the transfer of ownership of the model. Below I present its most important fragments:

Prior to modeling, the project team should address the following requirements and document them in BIM Performance Plans (BEPs): • Define modeling methodologies • Define modeling coordinates • Define required discipline models • Define elements for inclusion in models • Define information exchange • Assign responsibilities related to model element creation (MEA) • Define non-graphical information necessary to achieve selected BIM applications • Define the use of material properties • Define model coordination processes, including clash detection sequence and model coordination precision • Define requirements for pattern exchange and document and information export • Check and clean up methodologies to maintain model performance and data integrity • Define file import methodology;

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Consider the following points within the overall project modeling methodology: • Model configuration, including project geolocation coordinates • Use of locally modeled components or geometry • Large model partitioning strategy • Model file naming conventions • Project templates (2D output appearance control) • System naming conventions ( services, etc.) • Naming conventions for elements (walls, partitions, doors, windows, columns, fan coils, etc.) • Object classification standards (Uniclass, Unformat, Omniclass, CBI, etc.). • Naming conventions for materials and finishes • Properties / model object parameters • Object property / parameter naming conventions;

A company participating in a BIM project should have a solid set of internal modeling standards and follow the practices described in this handbook.

There are many standards for creating software specific objects that guide best practice methodologies. In addition, the NZ Open BIM Object Standard (OBOS) provides a framework for the consistent creation, maintenance and use of software-independent BIM objects throughout the building lifecycle.

To maximize the reusability of information in BIM, make sure spaces are consistently defined and named. The importance of spatial modeling varies with BIM applications. Defined spaces and their elements can be used to analyze sustainable design, heat loads, lighting levels, etc. This information can be exported to gbXML, where it can be used by third-party software. Conceptualization can also be exported to gbXML and ready for analysis.

All areas above the agreed size (e.g. 1m2) should be tracked and identified by name. The physical space may contain several areas that have different classifications of the functional space. They should be modeled and identified as separate spaces.

The use and importance of LOD is one of the least understood aspects of the BIM process. There are many documents on this subject, the most complete of which is the LOD Specification, developed by the BIM Forum (https://bimforum.org/lod/). LOD is a scale used to show the credibility of content that can be included in BIM. Includes specific model elements at different times during model creation. The main purpose of LOD, when included in MEA schedules and BIM execution plans, is to explain what each design / engineering team member is required to write for in their models at each stage and to what extent others can rely on them.

Successful coordination of models depends on understanding their roles through different BIM disciplines - and modeling only what they are responsible for (usually on the MEA schedule). Coordination is much more than just collision detection. Consider building as part of this process. Regular communication between all parties is key to effective coordination. Overall coordination should take place in the early design phases (preliminary and development), through visual inspection of the model. This includes coordinating one discipline and coordinating the models of other disciplines, and is the responsibility of all BIM managers in the discipline.

There are two types of model passing during the design phase: work-in-progress or iterative in replacement of the model and replacement of the model at the end of the phase (preliminary, developed and detailed design). In both cases, it is important to ensure that there is a process for communicating changes and models that are fit for purpose. For iterative model exchanges, inform each design discipline of changes to the models. However, with frequent exchanges, communicating changes is problematic as the model is constantly evolving. It is extremely important to identify changes to the model that will affect workflows in other design domains, such as ceiling height, mesh spacing, and floor level changes. The BIM manager should consider the level of change to be communicated and whether the application of MDD is appropriate in the early stages of design. As an absolute minimum, the model issuer must clearly state, for example, what it can be used for: • Published for informational purposes - issued for informational purposes only • Work in progress - issued for ongoing coordination;

One of the main benefits of building information modeling for the customer or building operator is the use of BIM for asset management when the building is occupied. The information that matures during the design and construction process is captured in the appropriate models. The BIM Project Execution Plan should specify the customer's products, the required file formats and the people responsible for delivering them.

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[1] pixabay.com

[2] Annex A - NEW ZEALAND BIM HANDBOOK - 2019 THIRD EDITION - BIM ACCELERATION COMMITTE; BUILDING RESEARCH LEVY; MINISTRY OF BUSINESS INNOVATION & MPLOYMENT HIKINA WHAKATUTUKI - THIRD EDITION - New Zealand 2019 - www.biminnz.co.nz https://www.biminnz.co.nz/s/NZ-BIM-Handbook-AppendixA-Modelling-and-documentation -practice-April-19.pdf