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 18.3.2
Seismic Design
The A/E shall provide for seismic design in accordance with the
requirements of NAVFAC P-355, "Seismic Design for Buildings", NAVFAC
P-355.1, "Seismic Design Guidelines for Essential Buildings", or
NAVFAC P-355.2, "Seismic Design Guidelines for Upgrading Existing
Buildings" as appropriate. The Appendix "A" will indicate the
seismic zone applicable to the project. Seismic design for minor
rehabilitations of existing facilities is generally not required.
Each design discipline must participate in the conceptual design for
seismic considerations. Potential problems of interferences, such as
the location of bracing elements, mechanical and electrical services,
openings, and the locations of seismic joints, can be identified and
more easily resolved at this stage of the design.
Seismically resistant frames, walls, diaphragms and other elements
are to be carefully coordinated with the architectural layout of the
building.
Detailing of all structures must conform to the provisions of the
NAVFAC P-355 series regardless of the controlling lateral loading
(refer to Pages 1-1 and 1-2 of NAVFAC P-355 included herein as
Attachment 18A to this chapter).
In seismic zone 2 and above, masonry must be reinforced (refer to
Page of 8-11 of NAVFAC P-355 included herein as Attachment 18B to
this chapter).
The NAVFAC P-355 series manuals describe the allowable structural
framing systems for seismically designed structures. In addition,
they provide design guidance and detailing recommendations for
architectural, mechanical and electrical equipment. Special
provisions for utilities are also included.
18.3.3
Design Loads
MIL-HDBK 1002/2, "Structural Engineering-Loads", provides governing
loads for the design of structures. As an aid in determining
appropriate design loads, NORTHDIV will provide the A/E design data
for wind velocity and frost penetration prior to the start of design
(usually at the A/E Orientation meeting).
18.3.4
Roof Design
For new construction, a minimum slope of 1/2 inch per foot is
preferred. Obtain pitch by sloping the structural members in lieu of
using moisture bearing lightweight concrete fills, asphaltic dry
fills, or tapered board insulations.
For projects involving reroofing of existing roofs, the A/E shall
provide calculations to show that the existing roof framing will
support the new roof materials as well as the effects of all live and
dead loads.
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