Finding Axial Forces in a Truss to Solving for BC, BD, and BE

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Discussion Overview

The discussion revolves around determining the axial forces in specific members (BC, BD, and BE) of a truss structure, which is part of an airplane's internal framework. The focus is on applying methods of statics to analyze the truss, including identifying support reactions and zero force members.

Discussion Character

  • Homework-related, Technical explanation, Mathematical reasoning

Main Points Raised

  • One participant suggests starting by determining the support reactions and identifying zero force members before applying methods to solve for member forces.
  • Another participant proposes dividing the truss along specific members (CE and BD) and notes that the x force at point B is equivalent to the force in member BD.
  • A later reply reiterates the need to determine force reactions and zero force members before making cuts and suggests using the method of sections to analyze the forces in members BE and BD.

Areas of Agreement / Disagreement

Participants generally agree on the need to identify support reactions and zero force members before proceeding with the analysis, but there are differing opinions on the specific approach to dividing the truss and the methods to be used.

Contextual Notes

Some assumptions regarding the truss configuration and loading conditions are not explicitly stated, which may affect the analysis. The discussion does not resolve the best method to apply for solving the forces in the truss members.

Isimanica
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Homework Statement


1154516.jpg

The truss shown is part of an
airplane’s internal structure.
Determine the axial forces in
members BC, BD, and BE.

Homework Equations





The Attempt at a Solution


Ok I am trying to figure out how or where to divide this truss up and forces to draw when I do. I don't know where to cut to get started.
 
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First determine the support reactions. Then identify zero force members. Then use method of joints or sections to solve for the member forces.
 
So I should divide right down the middle of CE and BD correct?
And that the the two forces reacting at B the x force is also the force of BD, that they are one and the same.
 
Isimanica said:
So I should divide right down the middle of CE and BD correct?
And that the the two forces reacting at B the x force is also the force of BD, that they are one and the same.
You should first determine the force reactions and zero force members before cutting sections. Then, if you prefer the method of sections over the method of joints, you can do the cut as you described and sum moments about appropriate points in the appropriate free body diagram, to solve for the unknown forces in members BE and BD.
 

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