Structural · S-Z23JA

Circular Beam Penetration Detail

Materials

Elements

Beams Connections / Plates Roof / Floor Openings

About this detail

Reinforcing web plates surround circular beam penetrations of varying diameters relative to the beam depth. Web plates matching the steel grade of the beam are detailed for penetration diameters ranging from one-quarter to one-half of the beam depth, and from one-half to two-thirds of the beam depth. Edge clearances, spacing requirements, and minimum distances from flanges are defined alongside a web plate thickness schedule correlating specific plate thicknesses to beam sizes ranging from W21x to W36x. Continuous plates are specified when two or more penetrations occur together, while penetrations smaller than one-quarter of the beam depth require no web reinforcement.

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