Design
D - 28
(1) Earthquake resistance calculations
For carrying out earthquake resistance calculations, there are various earthquake resistance ranks, as shown in the table
below. Gas heat pump air conditioning equipment should be dealt with as common use equipment.
•Earthquake resistant equipment ranks
Earthquake resistance ranks and their meaning are as follows
(2)Method of verifying the strength of foundation bolts during an earthquake
●Calculation formulae and table of allowable stresses
•Design earthquake force
1)The design earthquake force consists of a horizontal force and a vertical force, acting simultaneously on the equipment
through the center of gravity.
2)The design earthquake force is given by the following formula.
Section through the short side
Equipment
(self weight W)
(pull out
force)
Foundation bolt
Notes
1) “Earthquake resistant” applies to important building services
2) “Common use applies to normal building services
3) Equipment with earthquake resistant supports is equipment
provided with earthquake resistant stoppers to prevent
amplification of shaking due to resonance. In this case, a
shock absorbing material is placed between the stopper and
the equipment so that the earthquake resistant stoppers are
not damaged or deformed by impact.
Notes
1) Small scale repairs are repairs that take up to 2 days
2) Main frame strength (static), fasteners for each component (bolts etc.).
3) Indicates foundation bolt calculation etc.
*From”Earthquake resistant equipment specification criteria for package air conditioners and water chillers”,
published by the Japan Refrigeration and Air Conditioning Industry Association.
The above criteria are applicable to normal air conditioning equipment installed in buildings subject to normal
approval procedures under the Buildings Standard Law (i.e., less than 60m high)
F
v
= F
H
2
1
F
H
=K
H
W
.
F
H
:Design horizontal force (N) W : Equipment operating weight(N)
K
H
: Design horizontal magnitude F
V
: Design vertical force (N)
7. Center of gravity position and earthquake resistant design
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