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Letterman Digital Arts Center - Case Study

The BIM Process

LDAC_P7_Varience meeting

Figure 7.  Weekly variance meetings hosted by France Israel of View By View.  The use of the BIM was critical in solving potential design problem as early as possible. Many of the problems were solved during these meetings. Handouts were distributed in PDF formats a day before the meetings.

Unfortunately, a few problems were undiscovered during the visual scanning of the building information model and were later corrected on the site.  Part of the problem was due to the fact that the BIM process started after the design documents were 60% completed.  Ideally, if the process had begun during the early design stage, more problems would have been avoided, including the complex MEP design issues.  Of course, this process is not infallible, but the earlier the process is started and the more experience one has in this field, the better probability there is of identifying and resolving potentially expensive problems.

In order to assess the benefits of the BIM process on a project, the costs associated with the early resolution of conflicts had to be determined.  An example of an estimated cost analysis is provided below. (Figure 8)

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Fugure 9  This is one of the central stair area located in Building A.  The others are located within the raised floor system. These 30’x2’x2’ cast concrete beams shown in red are facing upwards instead downwards.  The reason how this occured is that the building design calls for a raised plenum floor but in this particulars part of the building, there are no raised floors.

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Variance graph

Figure 8. Illustrates the cost implication of incorrectly cast concrete beams. Using BIM, the problem was discovered in the orange zone since the formwork was already in place, still averting costly corrections if found in the red zone. The red concrete beams shown in the illustration should have been downturned instead of upturned as there are no raised floors in this part of the building.

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