Transcript Lecture 15c.ppt

ME 221 Statics
Lecture #15c
Sections 6.6 – 6.7
ME221
Lecture #15
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Method of Sectioning
If the question is to find internal forces in selected
members of the truss, then one can alternatively
use the method of sectioning.
Example: Determine the force in members FG and FH
12 kN
A
C
12 kN
E
G
I
1.8 m
B
D
F
H
J
4 @ 2.4 m=9.6 m
ME221
Lecture #15
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12 kN
A
C
12 kN
E
G
FGE
I
1.8 m
FGF
B
D
FHF
F
12 kN
A
C
H
J
12 kN
E
G
FEG
I
FFG
B
D
 Fx
ME221
0
F
 Fy
0
Lecture #15
FFH
1.8 m
H
 M Anypo int
J
0
3