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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

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!

 

terryhendicottAnswer
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

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3 replies

Werner_E
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.

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    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

    Translate
      vnamboodheriCommunity Manager
      Community Moderator
      March 21, 2025

      Hello @engr_mkhalid, 

       

      It looks like you have some responses from our community champions. If any of these replies helped you solve your question please mark the appropriate reply as the Accepted Solution. 

      Of course, if you have more to share on your issue, please let the Community know so other community members can continue to help you.

      Thanks,
      Vivek N.
      Community Moderation Team.

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