Marriott at Rivercenter
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 The
15-story Marriott at Rivercenter in Covington, Kentucky exemplifies
the beauty, functionality, and economy that can be achieved with
concrete framing. Construction of the hotel began in 1997 and was
completed in 1998 at a total cost of $18 million. One of the noteworthy
aspects of this project is the transfer of the hotel structure to
an existing parking structure, which was constructed in 1995.
Structural
Framing System
The framing
system for the hotel consists of 5-in. (125-mm) thick concrete slab
supported on 5-in. (125-mm) thick concrete bearing walls that are
spaced 12 ft-6 in. (2.8 m) on center. The bearing wall system carries
both the vertical and lateral loads.
All primary reinforcement for the slabs and walls consists of high-strength,
deformed welded wire fabric. This helped in achieving a faster time
to completion since placement of the reinforcement occurred very
rapidly. Slabs were formed with a wall mounted forming system, which
eliminated the need for all shoring and reshoring, and which allowed
finish work to follow immediately after construction of the frame.
The existing parking structure had been designed to accept the loads
from the hotel structure; however, changes in the hotel layout subsequent
to the construction of the parking structure resulted in hotel walls
and parking structure columns that did not line up. To solve this
problem, a system of transfer beams was located at the second floor
of the hotel to transfer the loads from the bearing walls to the
existing columns. Since these transfer beams carried the loads from
the entire hotel and were heavily posttensioned, they were stressed
in three stages as the hotel was constructed.
Concrete
Versus Steel Framing
Concrete
was the only logical choice for this structure. Utilizing a concrete
system resulted in reduced floor-to-floor heights, which created
a substantial savings in interior finish coats. Slab soffits were
textured to create the finished ceilings, and concrete walls were
covered directly with interior finish material to create the finished
unit. Guests staying at the hotel benefit by the use of concrete
walls between all of the units, since this results in extremely
quiet rooms.
Credits
Owner: CPX Construction, Cincinnati, OH
Architect: KZF Inc., Cincinnati, OH
Structured Engineer: Cary Kopczynski & Co. Inc., P.S.,
Bellevue, WA
General Contractor: CPX Construction, Covington, KY
Concrete Supplier: Baker Concrete, Monroe, OH
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