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Unformatted text preview: 1 Ch. 8 Slide Ch. 8 – Development of the Reinforcement Part 2 2 Ch. 8 Slide ACI Provisions for Bar Cutoff • Development of Bars in Flexural Members is given in Ch. 12 of ACI • ACI318 recognizes indirectly the flexureshear interaction in its bar cutoff prescriptive requirements: • Bars that are cutoff need also to be sufficiently developed, that is, longer than from the critical location where they are required to resist bending: (i) at the locations of maximum bending and (ii) where some of the longitudinal reinforcement is cutoff. Other minimum requirements may apply as explained in the following slides. d l 3 Ch. 8 Slide Negative Bar Cutoff Theoretical Cutoff Location for Bars “B” u M "A" &"B") ( n bars u M M φ ≥ min M 093 ,min n( ) ' . s A cr c e ACI M AASHTO M f S → → = ( 29 "A"&"B") "A") "A") u 2 V 3 3 ( ( min ( , s bars n bars s bars c s A M M A and V V φ φ ≥ ≥ ≤ + Theoretical cutoff point for bars “B” tr x t x l Column or support Beam 1 Section 1 Bars “B” Bars “A” 2 Section 2 Bars “A” M u envelope 4 Ch. 8 Slide Negative Bar Cutoff Required Cutoff Location for Bars “B” u M Theoretical cutoff point for bars “B”...
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 Spring '12
 Restrepo
 bars, Cutoff, ACI, Splice, Continuous Support, Splice joint

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