A few questions about a problem involving Trusses

1. Oct 28, 2009

noobiest09

In this picture, http://i312.photobucket.com/albums/ll323/IAmMaxwellEdison/Members.jpg, what are the zero force members and how do I identify them?

I'm pretty sure that GH, CF, and CD are zero-force members. However, I'm uncertain if EH is a zero force member because load is being applied on point E. Also, are AB and AD zero-force members? because there is the reaction force from the pins so I'm not very sure. So basically, I think all of the members inside the truss are zero-force members if I were to follow this guide.

http://vcity.ou.edu/demoModules/analysis/truss/media/zeromem.gif

I'm sorry for asking so many questions, but I'm pretty sure I will be able to understand the concept much easier if these questions were answered. Thanks!

Last edited by a moderator: Apr 24, 2017
2. Oct 28, 2009

PhanthomJay

The rules for zero force members apply , in part, for one member framing into 2 colinear members.
GH, yes, but why CF and CD?
If GH is 0, what does that tell you about EH when you look at joint H?
Reaction forces are loads applied at a joint.
no.

3. Oct 29, 2009

noobiest09

Yeah, I tried just solving for each force on the members and I got only 2 zero-force members - HG and HE. Thank you! I have some more studying to do. "-o-. I thought it's three or more not just three. Thanks!

4. Oct 29, 2009

PhanthomJay

Great, good job.