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arcticf0x Group Title

Analyze this structure- Truss

  • 2 years ago
  • 2 years ago

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  1. arcticf0x Group Title
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    Here is the image.

    • 2 years ago
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  2. arcticf0x Group Title
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    My approach- Clearly using the method of sections. But there comes a point where taking moments is confusing.

    • 2 years ago
  3. JamesJ Group Title
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    If you're only given that one force, what I think you're going to find is a set of simultaneous equations in the force variables, which you'll need to solve. So go through and patiently set it up, setting all the moments about joints equal to zero, as well as sums of forces in x and y directions equal to zero, and you should have enough equations to solve for the forces due to the individual beams.

    • 2 years ago
  4. JamesJ Group Title
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    "If you're only given that one force", by which I mean the value of that one force.

    • 2 years ago
  5. arcticf0x Group Title
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    Nah, that force is not even useful when i cut it around DH, DC and EC and use the left part. Anyways i am working on it, will post the exact point where i am stuck.

    • 2 years ago
  6. JamesJ Group Title
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    That force is useful, because by symmetry that must also be the force at one other point...namely, at E

    • 2 years ago
  7. arcticf0x Group Title
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    Hmm, yeah right, how about i cut and analyze the right part.

    • 2 years ago
  8. JamesJ Group Title
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    No. Just translate that force over to E and stay where you are. It'll get confusing if you start looking at other beams.

    • 2 years ago
  9. JamesJ Group Title
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    Or at least that's what I'd do.

    • 2 years ago
  10. arcticf0x Group Title
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    Ok i got it, you need to extend one arm out to take the moment from that external point. The logic being, this kill 2 unknowns of the three! Thanks for posting here JamesJ!

    • 2 years ago
  11. JamesJ Group Title
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    Happy to help. It's also fun to see this problem, as I haven't see it for this sort of thing for a while.

    • 2 years ago
  12. arcticf0x Group Title
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    Haha ok, i have loads of these right now. Just 1 more day to the exam!

    • 2 years ago
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