Structural · S-47SEP

Hole through Steel Beam Web

Materials

Elements

Beams Connections / Plates Reinforcing Roof / Floor Openings

About this detail

Web penetrations for round and square openings pass through a wide-flange steel beam. Round openings incorporate a Schedule 40 steel pipe sleeve with a length equal to the flange width, positioned per plan and sized up to three-quarters of the beam depth maximum. Square openings feature horizontal and vertical stiffener plates welded to each side of the beam web, with plate thickness matching the beam web and dimensions sized as one-half the flange width. Fillet welds connect the reinforcing plates to the web, and corner radii are specified at one inch typical. Edge distance limits, vertical positioning boundaries, and span offset restrictions are provided for both opening types relative to the beam centerline. General notes restrict unapproved use, specify grade matching for stiffeners, exempt reinforcement for small openings in deep sections, and waive sleeve requirements for minor round penetrations.

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