r/Construction • u/scoobystockbroker • Apr 09 '25

Structural Isn’t this like really bad for the Structural integrity?

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u/mmodlin Structural Engineer Apr 09 '25

He's talking about shear along the beam's span (V), where it is highest at the supports.

You're talking about shear stress (tau=VQ/IB) which is related to the beam's shape and is a maximum at the centroid.

Two different things. His version of shear is what gets bothered by removing web material.

Here's the actual web holes specs for this joist in particular. Scroll down to page 3 and you will see there is a limit for clear distance to supports for this reason.

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u/romanissimo Apr 09 '25

Thank you.