BIM for Contractors
BIM for
contractors is slightly different for each of the different types of
construction firms. Contractors typically want specific information from BIM. The
models are typically used for estimating, coordination, construction planning,
fabrication, and procurement. The model allows for detailed building
information, including graphic views, and quantity takeoffs. A lot of the time
the models can also display temporary items, like equipment and formwork. The
modes can also include specifications about the entities, usually by including
a link to the text specification when selecting the entity. Sometimes, the models
also include analysis information, like loads, moments, and shear forces.
BIM
clash detection combines the two different types of clash detection that have
been performed, geometry-based clash detection and semantic/rule-based clash
detection. It allows give you the ability to see specific types of clashes,
like when a mechanical entity clashes with a structural entity. This is
possible because the objects are assigned systems at the very beginning of
design.
Models
are used for quantity takeoff and minor estimating. Estimators are still
necessary because BIM is not yet able to assess conditions and estimate, such
as unique and unusual wall assemblies. Although with quantity take-offs,
estimating has become slightly less tedious.
Source: Eastman, C. M. (2013). BIM handbook: a guide to
building information modeling for owners, managers, designers, engineers and
contractors. Hoboken, NJ: Wiley.
Responses:
Joseph: It’s interesting to read about the specific details
of parametric modeling and its benefits. I didn’t realize the little details that
work with the model, like making little edits to the design and all of the
model updating, eliminating errors. This is a huge advantage considering it is
very difficult to follow little edits when working with different programs.
Nick: The interoperability between file exchanging for different
teams was interesting to read about. I understand how complicated it can get
working in different file types, so reading about how important it is to
address the specific capabilities for the team and project was interesting.
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