Civil Engineering Reference
In-Depth Information
The allowable force in the compression flange plate at the splice location
(average at the centroid) is
11,378
(
12
)
4965
(
1
+
42.5
/
45
)
2
F
f
=
(
2.5
)(
20
)
=
27.5
(
0.97
)(
50
)
=
1333.7 kips.
Transfer of this force from girder flange to splice plate is by a slip-resistant
lap joint using A325 bolts
f
bv
=
17.0 ksi. The number of single shear bolts
required is
1333.7
(
1
)(
17.0
)(
0.6
)
=
n
fs
=
131 bolts
each side of the splice. The joint will be too long. To reduce the amount of
bolting required, a double shear splice using splice plates each side of the
compression flange is designed as shown in
Figure E9.10.
1333.7
(
2
)(
17.0
)(
0.6
)
=
n
fs
=
65 bolts
each side of the splice. Use 16 rows of four bolts.
For the splice cross section to be at least equal to the flange cross section
(50 in.
2
)
,try
20"
t
st
y
t
2-1/2"
y
b
t
sb
b
sb
5/8"
FIGURE E9.10
