This paper compares the constructability, cost and schedule of a new shallow flat soffit precast floor system with a typical precast floor system. The new system consists of continuous precast columns without corbels, partially continuous rectangular beams without ledges, partially continuous hollow-core planks (HC), and cast-in-place composite topping. The main criteria in the design of the new system includes: span-to-depth ratio of 30, flat soffit floor system, economy, and consistency with prevailing erection techniques. The new shallow flat soffit precast floor system has a depth and flat soffit comparable to cast in place systems. It has no constructability issues and costs $23.60/square foot as compared to $21.90/square foot for a typical precast system. Although the new system takes 20% longer erection duration than typical precast system, the flat soffit and shallowness of the proposed system outweighs the cost and duration disadvantages. The continuous beam connections also have the added benefit of eliminating shear walls in moderate wind load conditions. This investigation uses a typical six story hotel or office building with 16 bays 30 ft (9.14 m) x 30 ft (9.14 m) for construction costs and schedule comparisons.
ايليا عزت عشم حنين | Eliya Ezzat Asham Henin, Ph.D., P.E., S.E., PMP. | 5680