Force Diagram Assistance - please

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Discussion Overview

The discussion revolves around a practice assessment related to mechanics and structures, specifically focusing on constructing a force diagram for a pin-jointed frame after calculating forces mathematically using the method of joints. Participants seek clarification on notation and the representation of forces in the context of the force diagram.

Discussion Character

  • Homework-related, Technical explanation

Main Points Raised

  • One participant has completed the mathematical calculations for the forces in the frame and is now seeking assistance with constructing a force diagram.
  • Another participant expresses confusion regarding the notation used, specifically questioning whether the forces indicated by EJ and JF are meant to represent tension or compression.
  • A participant clarifies that the 40 kN and 20 kN forces are downward, while the two 70 kN forces are upward.
  • There is a further inquiry about the notation used for EJ and JF, as it lacks clear identification of tension or compression.

Areas of Agreement / Disagreement

Participants have not reached a consensus regarding the notation used for the forces, and there is uncertainty about the representation of tension and compression in the force diagram.

Contextual Notes

The discussion highlights a lack of clarity in the notation for forces, which may depend on specific definitions or conventions not provided in the initial posts.

gordy52
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Hey all.

I have a practice assessment on mechanics and structures.

question 1one was to calculate mathematically using the method of joint principle the magnitude and nature of the forces for all members of each frame. I have completed this part and the answers are acceptable.

But for question two I am asked to construct a force diagram of the same pin jointed frame. I have looked at force diagrams and even asked for assistance for I am still stuck, any assistance would be very much appreciated.

The triangle and answers from Question 1 are attached

Thank You.
 

Attachments

  • forcediagraminfo.jpg
    forcediagraminfo.jpg
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I'm confused about your notation. Are - forces tension or compression?
 
the 40kn and 20kn forces are downward forces and the two 70kn forces are upward if that's what you mean?
 
No, I meant EJ and JF both have -- in front and I was wondering what that meant. There is no identification of tension or compression and I thought you might be noting it in that manner.
 

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