Shear &acirc;€“ ACI-318 Design Approach for Beams

# Shear &acirc;€“ ACI-318 Design Approach for Beams -...

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1 Ch. 6 Slide Shear – ACI-318 Design Approach for Beams o n c s c s ACI-318: 45 Truss mechanism V V V 1 V (normal weight concrete) V up to a point 6 075 ' . c w v yt d f b d and A f s = + = = Φ = s c n c c c ACI-318 11.4.7.9: Maximum shear resisted in a section: 2 V 4V 3 Maximum nominal shear force in a section before diagonal compression failure develops: V V 4V 5V ' c w f b d = = + =

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Ch. 6 Slide Design Cases u n V V Factored demand Factored capacity ≤ Φ Any design will fall within the following 5 possible cases: V u v. low low moderate high v. high (diagonal compression failure) 1 2 3 4 5 V u ≤ΦV c /2 - shear reinforcement is not needed ΦV c ≥ V u > ΦV c /2 - provide minimum shear reinforcement Stirrup spacing: s ≤ min(d/2, 600 mm) Φ3V c ≥ V u > ΦV c - Shear reinforcement as per truss mechanism Stirrup spacing: s ≤ min(d/2, 600 mm) V u >Φ5V c – shear cannot be resisted, Increase f’ c , b w and/or d Φ5V c ≥ V u > Φ3V c - Shear reinforcement as per truss mechanism Reduced stirrup spacing: s ≤ min(d/4, 305 mm)
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## This note was uploaded on 04/09/2012 for the course SE 151A taught by Professor Restrepo during the Spring '12 term at UCSD.

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Shear &acirc;€“ ACI-318 Design Approach for Beams -...

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