This structural detail outlines geometry and clearance requirements for unreinforced circular penetrations in a steel beam web where the penetration diameter is less than or equal to the beam depth divided by four. A minimum top and bottom clear distance of four inches is maintained from the flange to the edge of the penetration. Penetrations must be spaced at a minimum distance equal to the sum of diameter one and diameter two typically, with specific minimum distances from beam connections and perpendicular framing members. Dashed lines indicate the typical allowable penetration zone within the web.
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