increases used in approved standards are permitted.
stories of a building due to dynamic response.
Detailing shall be in accordance with the approved
Another reason is that equipment supports often lack
standards.
the extra margin of safety provided by reserve
strength mechanisms, such as participation of
architectural
elements,
inelastic
behavior
of
10-3.
Mechanical and Electrical Equipment.
structural elements, and redundancy in the structural
system, which are characteristics of buildings.
a.
Introduction. This paragraph prescribes the
criteria for structural design of anchorages and
b.
General. All equipment anchorages and
supports for mechanical and electrical equipment in
supports designed under the provisions of this
seismic areas.
chapter will conform to the following requirements:
(1) Design Goals. The goal of design is that
(1)
Equipment supports or bracing on
the anchorages and supports will withstand the
buildings or other structures shall be designed in
accelerations induced by severe seismic disturbances
accordance with Paragraph 7-1 b (5).
without collapse or excessive deflection, and
withstand the accelerations induced by less severe
(2) Equipment on the ground. Mechanical
seismic
disturbances
without
exceeding
yield
and electrical equipment that is supported at or
stresses. The design forces are related to the inertia
below ground level will be considered to be non-
forces on the equipment, and are calculated on the
building structures, and are governed by other
weight of the equipment; accordingly, design
agency documents.
provisions often speak of equipment. The design is
for the supports of the equipment, however, not the
(3)
Weight limitations.
Equipment in
equipment itself.
Ordinary equipment, which is
buildings will be considered to be within the scope of
fabricated at some distance from the site and is
this chapter if the maximum weight of the individual
transported by truck and/or railroad, is assumed to
item of equipment does not exceed 10 percent of the
have adequate strength. Critical equipment, which
total building weight, or 20 percent of the total
may have to be substantiated by design or test, is
weight of the floor at the equipment level.
The
beyond the scope of this manual.
response of equipment is dependent upon the
response of the building in which it is housed. If the
(2)
Earthquake loadings.
The earthquake
weight of the equipment is appreciable, relative to
loadings applied to equipment supports are generally
the weight of the building, the interaction of the
higher than the earthquake loadings used in the
equipment with the building (i.e., the coupling
design of the building structural system. One reason
effect)
will
change
the
building's
response
is
the
amplification
of
the
ground
motion
characteristics. It is assumed that equipment within
acceleration transmitted to elements in the elevated
the above weight limitations has a negligible effect
10 16
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