AECT250-Lecture 10

AECT250-Lecture 10 - Lecture 10 Column Base Plates Columns...

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Lecture 10 - Page 1 of 6 Lecture 10 – Column Base Plates Columns must transmit vertical loads to the concrete footing. An intermediary steel base plate is used to distribute this column load without crushing the concrete . The design of steel base plates is based on the following: AISC Spec. Chapter J8 (p. 16.1-70) AISC Part 14 Base Plate thickness Concrete resistance to crushing Steel column Anchor rods (4 min. per OSHA) See AISC p. 14-9 Steel base plate Applied load “P”

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Lecture 10 - Page 2 of 6 The design of a base plate involves the following steps: P p = Nominal bearing strength of concrete = 0.85f’ c A 1 Design Bearing strength of concrete: φ c P p where φ c = 0.60 LRFD c p P where c = 2.50 ASD where: f’ c = specified compressive strength of concrete, KSI A 1 = area of steel base plate concentrically loaded on conc, in 2 = BN (where B and N use whole inches if possible) m = 2 95 . 0 d N n = 2 80 . 0 f b B n n m m 0.80b f b f B N 0.95d d See AISC p. 14-5
Lecture 10 - Page 3 of 6 t min = minimum base plate thickness per AISC p. 14-6:

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AECT250-Lecture 10 - Lecture 10 Column Base Plates Columns...

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