Design
D - 39
Bolt span
Short direction(l
1
)
l
1
=㩷㩷1,000 mm㩷 ………..70, 90 type 䋺1,000
120, 150, 190 type 䋺1,000
Long direction(l
2
)
l
2
=㩷㩷1,060 mm㩷 ………..70, 90 type 䋺1,060
120, 150, 190 type 䋺1,060
Actual strength of the foundation bolts
Short term allowable tensile stress(f
t
)
f
t
=㩷 176 㩷㩷N/mm
2
…㩷 for SS400 f
t
:176
Short term allowable shear stress (f
s
)
f
s
=㩷 99 㩷㩷N/mm
2
…㩷 for SS400 f
s6
:132×0.75
Pull out load on one bolt
Short direction(R
b1
)
R
b1
=㩷㩷 =㩷 1,614 N
Long direction(R
b2
)
R
b2
=㩷㩷 㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷=㩷 1,473㩷 N
Foundation bolt shear stress(
)
=㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷=㩷 15.6㩷㩷N/mm
2
㩷 Foundation bolt tensile stress
Short direction(
1
)
1
=㩷㩷㩷㩷㩷㩷㩷㩷
㩷㩷
=㩷 14.3㩷㩷N/mm
2
Long direction(
2
)
2
=㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷=㩷 13.0 㩷 N/mm
2
Allowable tensile stress in a bolt subject to simultaneous tensile and shear stress(f
ts
)
f
ts
=1.4 f
t
-1.6 =㩷 221.4㩷 N/mm
2
Judgment
Tensile load
Short direction䋺if R
b1
<T
a
OK R
b1
=㩷 1,614 㩷 <㩷 T
a
= 11,760
Long direction䋺if R
b2
<T
a
OK R
b2
=㩷 1,473 㩷 <㩷 T
a
= 11,760
Shear stress
if < f
s
㩷 OK =㩷 15.6㩷 <㩷 f
s
=㩷 99
Tensile stress
short direction䋺 if
1
< f
t
<㩷 f
t
㩷
=㩷 176
㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷 㩷㩷㩷㩷 OK
1
=㩷 14.3 㩷
㩷㩷㩷㩷㩷㩷
1
< f
ts
<㩷 f
ts
=㩷 221.4
Long direction䋺if
2
< f
t
<㩷 f
t
㩷
=㩷 176
㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷㩷 㩷㩷㩷㩷 OK
2
=㩷 13.0 㩷
㩷㩷㩷㩷㩷㩷
2
< f
ts
<㩷 f
ts
=㩷 221.4
F
H
h
h
G
–(W - F
V
)
l
G1
l
1
n
1
F
HG
- (W -F
V
)
l
G2
l
2
n
2
F
H
NA
R
b1
A
R
b2
A
11
12
3
δ
δ
δ
δ
δ
δ
τ
τ
τ
δδ
δδ
ττ
7. Center of gravity position and earthquake resistant design
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