First Draw FBD of whole structure. (a)
Sum Moments about E
lb
E
E
F
lb
E
E
F
lb
D
ft
D
ft
lb
ft
lb
M
Y
Y
Y
X
X
X
Y
Y
E
350
0
300
650
500
0
500
650
0
)
6
(
)
3
(
300
)
6
(
500
=
=


=
=
∴
=
+

=
=
=

+
=
∑
∑
∑
Next move to member BC see FBD (c)
X
Y
Y
X
X
Y
Y
Y
Y
Y
B
B
C
C
B
F
lb
B
B
F
lb
C
ft
C
ft
lb
M
=
=
+

=
=
=
+
+

=
=
=
+

=
∑
∑
∑
0
150
0
150
300
150
0
)
3
(
)
5
.
1
(
300
Need to Move to next Member to solve. FBD (b)
lb
B
ft
B
ft
lb
ft
lb
M
X
X
A
575
0
)
3
(
)
5
.
1
(
150
)
3
(
650
=
=
+
+

=
∑
Find Magnitude of resultant force
lb
B
B
F
F
Y
X
C
B
24
.
594
150
575
2
2
2
2
=
+
=
+
=
=
Use shear stress formula
Remember since double shear use either twice area
Or
half the force
ksi
psi
in
lb
A
V
C
B
C
B
05
.
6
6053
25
.
0
4
2
24
.
594
2
2
=
=
=
=
=
=
t
t
p
t
t
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