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

[engr_mkhalid]

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!

[Werner_E]

Your q_I, q_II and q_III 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 q_II.

[terryhendicott]

Hi,

Like this:

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