Ch. 8 – Development of the Reinforcement Part 2

Ch. 8 – Development of the Reinforcement...

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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 ACI-318 recognizes indirectly the flexure-shear 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 cut-off. Other minimum requirements may apply as explained in the following slides. d l 3 Ch. 8 Slide Negative Bar Cut-off Theoretical Cut-off Location for Bars B u M- "A" &"B") ( n bars u M M - 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 - + Theoretical cut-off 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 Cut-off Required Cut-off Location for Bars B u M- Theoretical cut-off point for bars B...
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Ch. 8 – Development of the Reinforcement...

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