Center-Of-Gravity And Earthquake Resistance; Earthquake Resistance Calculations; Verifying The Strength Of Foundation Bolts During An Earthquake - Sanyo SGP-EW120M2G2W Technical Data Manual

System Design

(1) Earthquake resistance calculations

Several earthquake-resistance ranks are used for carrying out earthquake-resistance calculations, as shown
in the following table. Gas heat pump air conditioners are considered to be common use equipment.
• Equipment earthquake-resistance ranks
Earthquake-resistance ranks and their meanings are as follows
Earthquake
resistant type
Common use
type
Small
equipment
Notes
1) Small-scale repairs are those that require up to two days to complete.
2) Mainframe strength (static), fasteners for each component (bolts, etc.)
3) Mounting bolt calculations, etc.
* The table is 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 (e.g., less than 60m high)

(2) 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 following formula gives the design earthquake force.
F =K ・W
H H
1
F = F
V H
2
Design horiz. Magnitude K
Equipment rank
Earthquake
resistant
Common use type
(Floor or pad mounting)

7. Center-of-gravity and earthquake resistance

Horiz. design force
Maintenance of
(Horizontal seismic
operation
Can be operated after
inspection
Can be operated after
small-scale repairs
(Note 1)
As above
F : Design horizontal force (N)
H
K : Design horizontal quake magnitude
H
(Japanese scale)
H
Notes
(Japanese scale)
1) "Earthquake resistant" refers to essential building services
1.5 G 2) "Common use type" refers to non-essential building services
3) Equipment with earthquake-resistant supports incorporates
1.0 G
Strength
calculation
coefficient)
Design target
1.5 G
value
1.0 G As above
0.6 G As above
W : Equipment operating weight (N)
F
V
stoppers to prevent amplification of shaking due to
resonance. In this case, shock-absorbent materials are
placed between the stoppers and equipment so that the
stoppers are not damaged or deformed by impact.
D-31
Earthquake-resistance
evaluation
Strength calculation or
verification test (Note 2), and
installation
earthquake-resistance
Installation
earthquake-resistance
evaluation (Note 3)
As above
: Design vertical force (N)