How do I determine the force in each member of the truss?

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Discussion Overview

The discussion revolves around determining the forces in each member of a truss structure, specifically focusing on a homework problem involving a steel truss with given parameters. Participants are exploring how to approach the problem, including calculations related to the weight of the members and the application of static equilibrium equations.

Discussion Character

  • Homework-related
  • Technical explanation

Main Points Raised

  • One participant states the problem involves calculating the force in each truss member and whether they are in tension or compression, given specific assumptions about the truss structure.
  • Another participant suggests starting by carefully reading the problem statement and following the provided instructions, including drawing a sketch of the frame.
  • A participant expresses uncertainty about how to calculate the weight of the bars and seeks guidance on this calculation.
  • It is noted that the bars have a mass per unit length of 4 kg/m, prompting a question about how to determine the total mass of a bar based on its length.

Areas of Agreement / Disagreement

Participants generally agree on the need to follow the problem statement and instructions, but there is uncertainty regarding the calculation of the weight of the bars and how to begin solving the problem.

Contextual Notes

Participants have not yet resolved how to calculate the weight of the bars, and there is a lack of clarity on the initial steps needed to solve the problem.

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Homework Statement



Assume that each member of the truss is made of steel
having a mass per length of 4 kg/m. Set p=0 , determine the
force in each member, and indicate if the members are in
tension or compression. Neglect the weight of the gusset plates
and assume each joint is a pin. Solve the problem by assuming
the weight of each member can be represented as a vertical
force, half of which is applied at the end of each member.


Homework Equations



Ʃm=0
Ʃfx=0
Ʃfy=0

The Attempt at a Solution



I don't really know how to start
 
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The best place to start is to read the problem statement carefully.

There are some directions about setting up the problem. Have you followed these instructions?
It might help you to draw a sketch of the frame as directed. Treat each of the members as a bar, and the bars are connected to each other by pins.
 
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SteamKing said:
The best place to start is to read the problem statement carefully.

There are some directions about setting up the problem. Have you followed these instructions?
It might help you to draw a sketch of the frame as directed. Treat each of the members as a bar, and the bars are connected to each other by pins.

I understand a little bit, someone told me that I have to calculate the weight of the bars first, and I don't really know how to do it, but if someone can tell me how to do that maybe I can do the problem.
 
The bars have a mass/unit length of 4 kg/m. If a bar is 4 m long, what is its mass?
 
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