A-33
Water Heat Exchanger Unit
8. Center of gravity and
earthquake resistance
8) Actual strength of anchor bolts
Short-term allowable tensile stress (f
t
) f
t
= 176 N/mm
2
for SS400, f
t
= 176
Short-term allowable shear stress (f
s
) f
s
= 99 N/mm
2
for SS400, f
s
= 132 × 0.75
9) Pull-out load on one bolt
End-on direction (R
b1
) R
b1
=
F
H
· h
G
– (W – F
V
) L
G1
L
1
· n
1
=
99
N
Broadside direction (R
b2
) R
b2
=
F
H
· h
G
– (W – F
V
) L
G2
L
2
· n
2
= 812 N
10) Anchor bolt shear stress ( )
τ
=
F
H
N · A
= 3.2 N/mm
2
11) Mounting bolt tensile stress
End-on direction (
δ
1
)
δ
1
=
R
b1
A
= 0.9 N/mm
2
Broadside direction (
δ
2
)
δ
2
=
R
b2
A
= 7.2 N/mm
2
12) Allowable tensile stress on a bolt subject to both tensile and shear stresses (f
ts
)
f
ts
=1.4 · f
t
– 1.6
τ
= 241.2 N/mm
2
(3) Judgment
1) Tensile
load
End-on direction, if R
b1
< T
a
OK
R
b1
=
99
< T
a
= 11,760
Broadside direction, if R
b2
< T
a
OK
R
b2
= 812 < T
a
= 11,760
2) Shear
stress
if
τ
< f
s
,
OK
τ
= 3.2 < f
s
= 99
3) Tensile
stress
End-on
direction: if
δ
1
< f
t
<
f
t
= 176.0
OK
δ
1
= 0.9
δ
1
<f
ts
<
f
ts
= 241.2
Broadside
direction:
if
δ
2
< f
t
<
f
t
= 176.0
OK
δ
2
= 7.2
δ
2
<f
ts
<
f
ts
= 241.2
GHP Chiller TECHNICAL DATA.indb A-33
GHP Chiller TECHNICAL DATA.indb A-33
2012/04/06 13:42:07
2012/04/06 13:42:07
