Engineering statics: Truss Analysis Question

Click For Summary

Discussion Overview

The discussion revolves around the analysis of a truss in engineering statics, specifically focusing on identifying zero force members within the structure. Participants are exploring the application of rules related to zero force members and how to determine their status through calculations.

Discussion Character

  • Homework-related, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions whether members BE and CE can be assumed to be no force members.
  • Another participant outlines the rules for identifying zero force members, suggesting that these rules could apply to BE and CE.
  • A participant asserts that rule 1 applies to both BE and CE, indicating they might be zero force members.
  • Another participant points out that joint C has a force of 500 lbs acting on it, implying that CE cannot be a zero force member.
  • A participant expresses uncertainty but suggests that a small calculated force for CE might indicate it is a zero force member.
  • One participant proposes resolving the forces in the members to determine if BE is a zero force member, indicating a method of verification.

Areas of Agreement / Disagreement

Participants express differing views on the status of members BE and CE as zero force members, with some supporting the idea while others challenge it based on the presence of external forces. The discussion remains unresolved regarding the definitive classification of these members.

Contextual Notes

Participants reference specific rules for identifying zero force members but do not reach a consensus on their application to the members in question. The presence of external forces and the calculations performed are noted as factors influencing the determination of zero force members.

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: 543
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
7K
  • · 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
849
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
2
Views
3K