15 September 1999
EXAMPLE PROBLEM C1
REINFORCED CONCRETE FRAMES AND SHEAR WALL BUILDING
The H-shaped barracks (Building 1452) is a three-story cast-in-place reinforced-concrete
structure located at Fort Lewis, Washington. According to the available drawings obtained
before and during the initial site visit, it was designed as a two-company barracks and mess hall
in 1956. It is one of ten similar buildings at the installation.
The barracks consist of four separate structures with 2-inch separation between adjacent
structures. Dimensions of the two end structures (two legs which form the H) are each
approximately 39 feet by 117 feet. Dimensions of the structure located between the two wings
are approximately 23 feet by 156 feet. These three structures are each 3 stories. The fourth
structure that ties into the center structure is a 2-story mess hall with a partial basement. The
dimensions are approximately 59 feet by 78 feet. See Figure C1-1 for First Floor Plan and
Figure C1-2 for typical structural sections.
a. Vertical-Load-Resisting System. The vertical-load-resisting system consists of
reinforced concrete flat slab and columns and is essentially the same for all four structures. The
columns are nominally spaced at 19 feet in both directions of building axes. The slab thickness
is typically 7 inches at the roof, and at the third- and second-floor levels. The first floor slab is 4-
inch-thick concrete on grade. The footings consist of individual spread footings for the columns
and strip footings along the perimeter of the structures.
The interior columns are 14-inch square with relatively light reinforcing and #3 ties at 12 inches.
The perimeter framing is a beam-column framing system. The columns are 12 inches by 24
inches, with the major axis oriented in the longitudinal axis of the structures. The beams are
typically 12 inches wide by 18 inches deep, or 10 inches by 15 or 18 inches deep.
b. Lateral-Load-Resisting System. The primary lateral-force-resisting system consists
of the concrete floors acting as diaphragms transmitting lateral forces to the perimeter frames.
The lateral-force-resisting frame system consists of rectangular columns and beams. The
transverse lateral-force-resisting system of the two end structures consists of 8-inch-thick
concrete shear walls at the ends of each structure.
C1-2. Building Review Report
a. Seismic Review of Structural Systems. The review procedure described in Chapter 2
is performed for all four of the structures that comprise Building 1452. A separate Lateral Load
System Data Sheet and Structural Review Score Sheet was completed for each structure,
except that the data for the two identical wings are combined on each of the two capacity forms.
The following forms, along with the recorded data for Building 1452, are included in this section.
b. Lateral Load System Data Sheet (Figures C1-3, C1-5 and C1-7). This form is filled
out in accordance with the instructions contained in Appendix B. The information is extracted
from the building drawings reviewed in the Base Public Works office, and confirmed by visual