Structural · S-G4NDP

Circular Beam Penetration Detail

Materials

Elements

Beams Connections / Plates Roof / Floor Openings

About this detail

Circular beam penetration details show reinforcement requirements for web openings in wide-flange steel beams based on penetration diameter relative to beam depth. When penetration diameter is between one-quarter and one-half the beam depth, web plates are required on top and bottom with minimum clearance dimensions of d/4 from flanges. When penetration diameter is between one-half and two-thirds the beam depth, web plates require tighter vertical clearances of d/6 from flanges. A web plate schedule matches plate thicknesses from three-eighths to three-quarters of an inch to specific beam sizes ranging from W21x to W36x, with plate grades matching the beam steel grade. Continuous web plates are specified when two or more penetrations occur closely together, while penetrations smaller than one-quarter of the beam depth require no web reinforcement.

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