Engineering statics: Truss Analysis Question

Click For Summary
SUMMARY

The discussion focuses on the identification of zero force members in truss analysis, specifically members BE and CE. The rules for determining zero force members are clearly outlined, stating that if a joint has three members with no external forces and two are collinear, the third is a zero force member. The participant concludes that BE is likely a zero force member based on these rules, while CE's status remains uncertain due to a small calculated force. The calculations and application of the rules are essential for confirming the status of these members.

PREREQUISITES
  • Understanding of truss structures and their components
  • Familiarity with the principles of static equilibrium, specifically ΣF = 0
  • Knowledge of zero force member identification rules in truss analysis
  • Basic skills in performing force calculations within truss systems
NEXT STEPS
  • Study the rules for identifying zero force members in truss analysis
  • Practice solving truss problems using the method of joints
  • Learn about the implications of internal forces in truss members
  • Explore advanced truss analysis techniques, such as the method of sections
USEFUL FOR

Students and professionals in civil engineering, structural engineering, and mechanics who are involved in truss analysis and design will benefit from this discussion.

narutoish
Messages
25
Reaction score
0

Homework Statement



So I was working on this problem, and my only questions are wether BE and CE can be assumed to be no force members? Also if I am not sure a member is a no force member, will it be revealed once I do the calculations,

Homework Equations



ΣF = 0

The Attempt at a Solution



I just need clarification on my questions, I can do the rest .

Thanks
 

Attachments

  • image.jpg
    image.jpg
    20.7 KB · Views: 531
Physics news on Phys.org
Remember the rules which apply to zero force members. These are:

1. If a joint contains three members with no external forces and two of the members are collinear with the third member connected from the joint, then the third member has an internal force of zero.
2. If two members aren't collinear and there are no supports or external forces acting on the joint connecting these members, then both members have an internal force of zero.
3. If two collinear members are connected by a joint and one member is known to have an internal force of zero, then the other member also has an internal force of zero.

With this in my mind, are members BE and CE zero force members?
 
Well rule 1 appies to both BE and CE so I am going to say they are?
 
Joint C has a force of 500 lbs acting on it, it can't be a zero force member.
 
oh yes makes sense, but but BE is, correct?
 
Ok so when I calculate it I am getting a really small number for CE which is leading me to think it is a zero force member.
 
Honestly, I'm not sure. The way I would do it is just try and resolve the forces in the members. If BE is a zero force member, then you can calculate it to have a force of zero.
 

Similar threads

  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
6K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 7 ·
Replies
7
Views
4K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 2 ·
Replies
2
Views
760
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
2
Views
3K