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System Design
(4) Example anchor bolt calculation
Earthquake-resistance evaluation of Model SGP-EW240M2G2W
1) The earthquake-resistance type is "Common use," so design horizontal earthquake factor K
(K
= 1.0 for rooftop installations, and 0.4 for ground installations.)
H
2) Refer to paragraph (3) on the previous page for the equipment center-of-gravity position.
3) Anchor bolts
Number of bolts = 4
Bolt diameter M12 (12 mm)
Note: If calculations give unacceptable results, change conditions and recalculate.
Example of evaluation using calculations
(1) Anchor bolt conditions
1) Total no. of bolts (N)
2) Bolt diameter (D)
3) Bolt cross-sectional area (A)
4) Bolts on one side (end-on direction, n
5) The installation method is for "embedded J or JA type bolts," on a 15-cm-thick slab
Anchor bolt allowable short-term tensile load (T
(The installation method may also be selected after completing calculations.)
(2) Calculation
1) Design horizontal seismic magnitude (K
2) Operating load (W)
(= operating mass × 9.8)
3) Horizontal earthquake force (F
4)Height of center-of-gravity (h
5) Vertical earthquake force (F
6) Distance from center-of-gravity to bolt
End-on direction (L
Broadside direction (L
7. Center-of-gravity and earthquake resistance
)
1
(broadside direction, n
)
2
)
H
)
H
)
G
)
V
)
G1
)
G2
N =
4
current models have four bolts
D = 12
mm for M12 bolts
2
A = πD
/ 4 = 113 mm
n
= 2
current models have two bolts
1
n
= 2
current models have two bolts
2
) Ta = 11,760 N
a
K
= 1.0
Installation location: K
H
W =
8,330
N
F
= K
・W ＝ 8,330 N
H
H
h
= 680 mm
G
F
= F
/ 2 =
4,165 N
V
H
L
= 443
mm
G1
L
= 506
mm
G2
D-41
is 1.0 G.
H
2
roof
: 1.0
H
ground : 0.4
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