Use of Formwork Tabular Comparative Analysis
The fact that a tunnel form is used for only one-way slabs supported by a wall makes this system (tunnel form) an inappropriate choice. It should therefore be eliminated. Also, the potential number of reuses (14) cannot justify the use of tunnel forms which require at least fifty reuses. Flying truss and column mounted shoring systems are also eliminated because of the restricted site characteristics in downtown Washington D. C. (Pennsylvania Avenue). Crane movement is limited even though adequate crane service is available. Also, the irregular column spacing strongly suggests the elimination of these systems. As a result the choice is narrowed to either conventional wood or aluminum systems. A review of Table 5.2 reveals that a conventional aluminum system is a more appropriate selection than a conventional wood system for the following reasons:
1. The building size is 315,000 ft2 (29,300 m2), which is more appropriate for the aluminum system (look at building shape ‘‘dimension limitations’’).
2. The story height in the first three floors is 14.5 ft (4.42 m) (look at height stories).
3. The area is characterized by high quality and expensive labor force (look at area practice).
It should be noted that the conventional wood system can be used, but the conventional aluminum system is more appropriate.