H-2 Bachelor Enlisted Quarters
This design example illustrates the seismic design of a three-story Navy bachelor enlisted quarters (BEQ)
building. The layout of the building is based on the Navy 1+1 module which allocates approximately 462
sq. ft. (42.9m2) to a two-person living suite as indicated in Figure 1.
(1) Purpose. The purpose of this example is to illustrate the design of a representative
military building in an area of high seismicity, using the provisions of FEMA 302 as modified by this
(2) Scope. The scope of this example problem includes; the design of all major structural
members such as beams, columns, and shear walls. The design of the foundations, nonstructural elements
and their connections, and detail design of some structural elements such as reinforced concrete slabs on
grade were not considered part of the scope of this problem and are therefore not included. Additionally,
this problem considers only seismic and gravity loads.
(1) Function. The function of a BEQ is to provide living quarters for enlisted personnel. The
Department of the Navy has various standard modules for living areas. The modules can be arranged
together with designated administrative and communal spaces to form the BEQ. In this example, a two-
person living suite was chosen and the designated administrative and communal areas were provided on the
1st Floor. The building as indicated in Figure 1 would house 70 enlisted personnel.
(2) Seismic Use Group. Since the building is not described by any of the occupancies in
Table 4-1 for special, hazardous, or essential facilities, it will be designated as a standard occupancy
structure within Seismic Use Group I.
(3) Configuration. The standard Navy modules may be arranged in any desired
configuration. The selected module, as shown in Figure 1, was designated for access from an interior
hallway. This typical "motel" type configuration using a double-loaded interior corridor was selected as
being the most efficient and economical configuration. A small reception and lounge area by the main
stairway was provided at the main entrance on the 1st Floor and an additional stairway was provided at each
end of the building.
(4) Structural Systems. The continuous vertical alignment of the transverse walls between
the suites makes these walls ideal candidates for bearing and shear walls. Similarly, the need for
fenestration at the exterior walls makes the use of longitudinal moment frames a logical choice. Precast
cored concrete slabs were chosen for the framed floor system. These commercially available units are
capable of spanning between the separation walls without intermediate supports. The soffit of the precast
slabs forms the exposed ceiling in the service and sleeping areas. Furred ceilings in the corridors, bath, and
storage areas can accommodate the heating and ventilation ducts for each of the modules. Lateral loads are
transferred by the reinforced topping through dowels to the shear walls or frames and, in turn, to the
(5) Choice of materials. The bearing/shear walls could be designed as reinforced masonry
rather than cast-in-place concrete. The masonry would be equally functional and in some areas of the U.S.
may be more economical. Many alternatives, using cast-in-place or precast configurations, are available
for the floor framing. A desirable prerequisite is that the floor be relatively stiff and have low acoustic
transmission. The precast slabs with reinforced topping were chosen for the reasons discussed in
subparagraph (4) above. All walls not shown on the floor framing plans are intended to be nonstructural
and shall be constructed so as to not impair the response of the concrete frames or shear walls.