F.
Both SMACNA and NUSIG list conditions under which seismic
bracing may be omitted. However, a design professional may
revoke these omissions on an individual project basis.
16.2
CONFORMANCE WITH SMACNA:
A.
Requires a design professional to develop a Seismic Hazard
Level (SHL) for a specific project for use of its manual. The
SHL is derived from a combination of factors such as
applicable building codes, seismic zones, and importance
factors into a single system for determining appropriate
bracing or restraints. A building with an SHL of "A" requires
the strongest restraints, whereas, a building with SHL of "C"
requires the least restraints. The design professional is
responsible for specifying the SHL of "C" requires the least
restraints. The design professional is responsible for
specifying the SHL, not the contractor.
16.3
CONFORMANCE WITH NUSIG:
A.
NUSIG has developed guidelines as a service to the design
professionals. The guidelines are not intended as a substitute
for design. The design of seismic bracing remains the
responsibility of the design professional who must review the
specific project for its applicability before using or
specifying NUSIG guidelines.
B.
NUSIG manuals of designs are pre-calculated from 0.05g through
1.00g in increments of 0.05g.
16.4
CALCULATIONS
Unless otherwise shown by SMACNA or NUSIG, provide detailed
structural calculations for VA's review on design of hangers,
supports, anchor bolts, and connections. Show sizes, spacing, and
length for securing to structural members, and length and sizes of
welds anchored to steel members.
16.5
DRAWINGS
A.
Where SMACNA or NUSIG details are incomplete or not
applicable, show complete seismic restraint requirements and
coordinate with the specifications. Coordinate mechanical work
with architectural and structural work. Special provisions and
details may be required.
B.
Piping Plans and Sections: Show the locations of required
restraints with reference to SMACNA, NUSIG, or special
restraint details, whichever is applicable.
C.
Equipment Restraints: Show special details where required. Pay
particular attention to suspended equipment.
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