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

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SUMMARY

The discussion focuses on determining the forces in each member of a truss made of steel with a mass per length of 4 kg/m. Participants emphasize the importance of reading the problem statement carefully and suggest drawing a sketch of the truss to visualize the connections between members. The key equations for solving the problem include Ʃm=0, Ʃfx=0, and Ʃfy=0, which are essential for analyzing static equilibrium. Additionally, participants highlight the need to calculate the weight of each bar based on its length to proceed with the force calculations.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Familiarity with truss structures and member forces
  • Knowledge of basic mechanics, specifically forces in tension and compression
  • Ability to apply the equations of equilibrium: Ʃm=0, Ʃfx=0, Ʃfy=0
NEXT STEPS
  • Calculate the weight of truss members based on their length and mass per unit length
  • Learn how to apply the method of joints to analyze truss forces
  • Study the principles of tension and compression in structural members
  • Explore software tools for structural analysis, such as SAP2000 or ANSYS
USEFUL FOR

This discussion is beneficial for civil engineers, structural engineering students, and anyone involved in analyzing truss structures and understanding the forces acting on structural members.

Jesus Trinidad
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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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