UFC 4-171-05
1 January 2005
with change 25 October 2006
structural design information.
3-7.1.2 The structural system should be the most cost effective design without
restricting the architectural and engineering aspects of the building, such as flexibility,
function, character, and symmetrical configuration for seismic resistance. A variety of
systems should be considered, and the one selected must satisfy the site, flexibility,
future expansion, program, economic and availability requirements. Note: availability of
hard metric construction materials plays a significant role in the structural design.
3-7.1.3
The following are typical structural framing systems preferred by AR.
3-7.1.3.1 Exterior walls will be concrete masonry or steel studs with a masonry veneer.
Concrete masonry is preferred due to durability and stiffness for masonry veneer
backup. If studs are considered for masonry veneer backup, design should limit stud
lateral deflection to L/600. AT/FP requirements restrict the use of load-bearing concrete
masonry and load bearing steel stud walls for multistory structures (three stories or
more, not including the basement, if applicable).
3-7.1.3.2 Roof framing consists of steel beams, steel bar joists, and steel roof deck.
Depending on local soil conditions, the lower level floor is reinforced concrete slab on
grade or structurally reinforced concrete slab. The remaining levels consist of either
steel form deck filled with concrete supported by steel bar joists, steel beams and
columns or precast plank supported on load-bearing concrete masonry walls.
Depending on requirements for fireproofing, composite steel beams may be an
alternative to steel bar joists in the above-mentioned systems. Consider pre-engineered
buildings for unheated storage structures. USAR strongly prefers tube columns for ease
of detailing and fit within exterior walls.
3-7.1.3.3 \ Use of wood in Army Reserve Projects is covered by ACSIM-AR
memorandum "Use of Wood for Military Construction, Army Reserve (MCAR) Projects"
dated 10 September 2002. The memorandum states on a project-by-project basis, if
aesthetically acceptable, economically feasible and approved by ACSIM-AR, heavy
timber or glued-laminated columns, beams, and trusses may be used in Army Reserve
Facilities. The memorandum specifically states that light wood framing is not
acceptable./2/
3-7.2
Design Loads
3-7.2.1 The following are minimum design loads. Some local building codes or design
requirements may be more stringent and will take precedence.
3-7.2.2
Gravity Loads
Roof live load
20 psf
1.0 kPA
Snow load (governs if greater than the minimum Roof live load of 20 psf
above) refer to \ UFC 3-310-01 /2/
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