Civil Engineering Reference
In-Depth Information
The net section moment of inertia of the spliced section is
0.625
(
85
)
3
12
0.46
)
2
231,420 in.
4
I
g
=
2
(
51
)(
43.75
+
+
2
(
8.93
+
26.04
+
2
(
0.67
))
+
=
2
4
(
1.00
)(
1.75
)(
45.875
)
2
4
(
1.00
)(
1.00
)(
42.00
)
2
I
n
=
231,420
−
+
=
231,420
−
43,575
185,163 in.
4
=
187,845
≥
OK, the moment of inertia at the splice is greater than the moment of inertia
of the cross section being spliced.
The maximum force in the tension flange plate at the splice location
(average at the centroid) is
8800
(
12
)
185,163
/
48.1
(
1
+
(
42.5
/
45
))
2
F
f
=
(
40
)
=
27.4
(
0.97
)(
40
)
=
1063.4 kips
The allowable force in the tension flange plate at the splice location (average
at the centroid) is
8822
(
12
)
185,163
/
48.1
(
1
+
(
42.5
/
45
))
2
F
f
=
(
40
)
=
27.5
(
0.97
)(
40
)
=
1066.0 kips
The number of double-shear bolts required is
1066.0
(
2
)(
17.0
)(
0.6
)
=
n
fs
=
52 bolts
each side of the splice. Use 13 rows of four bolts as shown in Figure E9.11.
5-1/4"
12 @ 3" = 3"-0"
4"
4"
10"
FIGURE E9.11
