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engr_mkhalid10-Marble
10-Marble
March 15, 2025
Solved

Help with Plotting Shear Flow Distribution q(y) for a Box Cross-Section in Mathcad Prime

  • March 15, 2025
  • 3 replies
  • 814 views

Hi Mathcad Community,

 

I’m working on a problem involving a box cross-section. I need to plot the shear flow distribution q(y) along the height (y). The plot should be linear in the flanges and parabolic in the webs, but my current plot is a step function and doesn’t match the expected values. Can someone help me redefine q(y), and provide the correct Mathcad function to plot a continuous shear flow distribution?

Thanks for your help!

 

Best answer by terryhendicott

Hi,

Like this:

Maximum stress is at the neutral axis in the webs at 4.682 MPa

Capture.JPG

3 replies

W
Werner_E25-Diamond I
25-Diamond I
March 15, 2025

Your qI, qII and qIII are constant values, so you can't expect anything else but a step function.

I guess you will have to torn these variables into functions dependent on y to see a different plot.

E.g. you have to define what the q-value for example for y=110mm should be.

The way you defined is at present is that its 14.844 N/mm, the (constant) value of qII.

    T
    terryhendicott21-Topaz IIAnswer
    21-Topaz II
    March 16, 2025

    Hi,

    Like this:

    Maximum stress is at the neutral axis in the webs at 4.682 MPa

    Capture.JPG

      V
      vnamboodheriCommunity Manager
      Community Moderator
      March 21, 2025

      Hello @engr_mkhalid, 

       

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