Project Description: This hotel complex is made up of five towers; two 8 story structures, two 13 story structures and one large 21 story U-shaped structure in the center. The hotels and convention center are cut into the slopping river bank. The 21story hotel structure faces out to the river with the two wings of the U-shape stepping down to the two 8 story structures. The wings on both the 21 story and the 8 story structures are connected by a glass covered steel truss canopy which creates an extensive atrium between the two hotel wings. The lower levels of the hotel complex are made up of restaurants, bars, lounge areas, meeting and banquet rooms as well as hotel offices and service areas.
The typical hotel levels consist predominately of 8” thick post-tensioned slabs with a combined footprint of approximately 110,000 square feet on the largest level and stepping back to 40,000 square feet at the upper roof area. In total there is approximately 1,600,000 square feet of elevated slab.
Elevator core walls and shear walls were used to provide the required shear elements for the 21 story structures. The shear walls were formed using a heavy ganged steel strong-back and waler system. The elevator cores were formed using the same heavy ganged system, but were accessed using a lift-n-lock platform which allowed crews to access these work areas safely. The typical suspended slabs were formed using column mounted truss flyers while the lower less typical areas were formed utilizing conventional hi-load frames and aluminum joist.
In the center area of the 21 story tower at the 5th floor the design required the construction of four 9’-0” deep 4’-0” wide transfer girders with a shore height of approximately 40 feet. These girders were used to eliminate 2 rows of columns at the lower level and pick up the transposed load of the columns as they were reintroduced into the level directly above.
The roof and penthouse level of the 21 story structure included complex cantilevered slabs and numerous elevation changes requiring extensive design work by our in-house engineering team members.
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