Standard geometric limitations and placement requirements for web penetrations in steel beams govern both circular and rectangular openings relative to the beam depth d and distance from supports. Key spacing rules dictate minimum clearances to supports, centerlines, and flange edges unless otherwise noted on plans or schedules. Corner radii and maximum dimension limits are specified for rectangular openings to maintain structural integrity.
d = MINIMUM CLEAR TO SUPPORT OR POINT LOAD, TYPICAL H d = MINIMUM CLEAR TO SUPPORT OR POINT LOAD (TYP) e e = d/2 UON ON PLAN OR SCHEDULE e e = d/2 UON ON PLAN OR SCHEDULE d/6 x d/6 MAXIMUM OPENING SIZE UON ON PLAN OR SCHEDULE CL CIRCULAR OPENING SEE PLAN OR SCHEDULE FOR OPENING SIZE CL SUPPORT CL RECTANGULAR OPENING R CL SUPPORT CL PENETRATION CL PENETRATION 0' - 8" MIN d/6 MIN d/6 1' - 7 3/8" 1' - 1 1/8" d = BEAM DEPTH 1' - 6 3/8" W 0' - 5" MIN d/6 MIN d/6 d/2 1' - 1 1/8" d = BEAM DEPTH d/2 A CIRCULAR PENETRATION B RECTANGULAR PENETRATION DIA = d/6 MAXIMUM UON ON PLAN OR SCHEDULE . d = MINIMUM CLEAR TO SUPPORT OR POINT LOAD, TYPICAL H d = MINIMUM CLEAR TO SUPPORT OR POINT LOAD (TYP) e e = d/2 UON ON PLAN OR SCHEDULE e e = d/2 UON ON PLAN OR SCHEDULE d/6 x d/6 MAXIMUM OPENING SIZE UON ON PLAN OR SCHEDULE CL CIRCULAR OPENING SEE PLAN OR SCHEDULE FOR OPENING SIZE CL SUPPORT CL RECTANGULAR OPENING R CL SUPPORT CL PENETRATION CL PENETRATION 0' - 8" MIN d/6 MIN d/6 1' - 7 3/8" 1' - 1 1/8" d = BEAM DEPTH 1' - 6 3/8" W 0' - 5" MIN d/6 MIN d/6 d/2 1' - 1 1/8" d = BEAM DEPTH d/2 A CIRCULAR PENETRATION B RECTANGULAR PENETRATION DIA = d/6 MAXIMUM UON ON PLAN OR SCHEDULE .
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