buildings_marr2The 15-story Marriott at Rivercenter, 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-inch thick concrete slab supported on 5-inch thick concrete bearing walls that are spaced 12 feet 6 inches 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 post tensioned, 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, Ohio

Architect:
KZF Inc., Cincinnati, Ohio

Structural Engineer:
Cary Kopczynski & Co. Inc., P.S., Bellevue, Washington

General Contractor:
CPX Construction, Covington, Kentucky

Concrete Supplier:
Baker Concrete, Monroe, Ohio

Year:
1998