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STATICS SPRING 2018 Lesson 27: Trusses III: ZFM’s “Every man dies. Not every man really lives” – the character of William Wallace, as played by Mel Gibson, Braveheart
LESSON 27: TRUSSES III – ZERO FORCE MEMBERS (ZFM’S) (DRAFT)Wednesday, March 7, 2018
LESSON OBJECTIVES 1. Identify zero force members
READING Hibbeler Chapter 6 – Zero Force Members
IN-CLASS EXERCISE: IDENTIFY THE ZERO FORCE MEMBERS.
2.
3.
P
A B
C D
4.
P
A B
C D
5.
A
B
C
D
E
P
1.
6.
F
30º 30º
A
B
CDE
Problem 3
STATICS SPRING 2018 Lesson 27: Trusses III: ZFM’s Homework (due Friday)1, 2, 3. Identify all of the members in the three trusses shown that are zero force members.
F
A
B C D
E
G
H
Q
P
750 #1000 #
6’ 6’ 6’ 6’
8’
8’
Problem 1
Problem 2
FA
B C D
EGH
I J
4. Identify all of the ZFM’s and then solve all of the bar forces by any method.
