Some of the benefits that BIM offers to contractors includes constructibility & clash detection, quantity takeoffs & cost estimating, construction analysis & planning, integration with cost & scheduling aspects of construction, and the verification, guidance & tracking of construction. These benefits offer contractors more accurate budgeting and planning, more efficient methods of construction, and the ability to take on more complex and difficult projects. The constructibility & clash detection benefit of BIM is crucial because it could potentially save a contractor from unforeseen construction issues between disciplines. The quantity takeoffs & cost estimating that BIM can provide for contractors greatly increases their accuracy of budgeting and planning for projects. BIM also is able to provide contractors with a complete handover package to the owner at the end of a construction project with detailed information about virtually every aspect of the a building.
The types of information that BIM provides includes detailed building information such as beam and duct sizes, equipment models, material properties, thermal properties, etc. This information can be used by many different programs to further analyze the properties of a building and how well it will perform in different situations. Information provided by BIM that is more useful to contractors includes specification information of various building components, temporary component allocations such as shoring or formwork, and design & construction statuses along various phases of a project.
BIM models may be created in several different ways for use by the contractor and possibly the owner. If the contractor is only provided with 2-D drawings by the architect/ engineers they must create their own building information model and update it accordingly until the completion of the project. This type of model is usually less detailed, but may be more accurate to the actual building because it was created by the person(s) who built it. The other way that a building information model may be created is by the entire project team, the architect, engineer, and contractor, by each member contributing to a shared model. This type of model may be more detailed, but may be less accurate and contain errors due to the many different contributors.
Reference:
Eastman, Charles M. BIM Handbook : A Guide To Building Information Modeling For Owners, Managers, Designers, Engineers And Contractors. Hoboken, NJ: Wiley, 2011. eBook Collection (EBSCOhost). Web. 19 Jan. 2016.
Comments:
Adrian Kuzniarowicz
Karan Sagar Sinha
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