A few questions about a problem involving Trusses

[noobiest09]

Hi! I'm really having a problem understanding this part of statics so please help!

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!

 

[PhanthomJay]

Hi! I'm really having a problem understanding this part of statics so please help!

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

The rules for zero force members apply , in part, for one member framing into 2 colinear members.

I'm pretty sure that GH, CF, and CD are zero-force members.

GH, yes, but why CF and CD?

However, I'm uncertain if EH is a zero force member because load is being applied on point E.

If GH is 0, what does that tell you about EH when you look at joint H?

Also, are AB and AD zero-force members? because there is the reaction force from the pins so I'm not very sure.

Reaction forces are loads applied at a joint.

So basically, I think all of the members inside the truss are zero-force members if I were to follow this guide.

no.

 

[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!

 

[PhanthomJay]

Great, good job.