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.