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Homework Help: 3 Pinned Frame - Produce Calcs, BMD & SFD

  1. Jan 2, 2014 #1
    I have to provide calcs and then produce Shear Force Diagrams, Bending Moment Diagrams.
    I,ve completed it but I think I,m going wrong somewhere. The diagrams do not look correct. I suspect I,ve possibly got positive/negative values mixed up somewhere through it but I,m not totally sure. Any advice would be greatly appreciated.

    See attachment for the question & my workings.

    Attached Files:

  2. jcsd
  3. Jan 2, 2014 #2


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    your initial diagram does not show the pin at C.
    The frames are spaced 4.8 m apart , so the wind pressure must be multiplied by the frame spacing to get the horizontal frame load in units of kN/m.
    Otherwise your approach looks good, but you had an incorrect moment arm for that 10.6 N load ...should be 16 m not 8 m.
    When you draw shear and moment diagrams, there must be a moment at the upper corner joints, not 0 as you have shown. The horiz and vert members are rigidly connected at those joints.
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