CE
8. Strength Presentation II.ppt

# 8. Strength Presentation II.ppt - Strength Design II...

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Strength Design II American Concrete Institute (ACI) 318-14

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Detailing Issues 1. . . . efficiency of the bond between the concrete and the reinforcement [efficiency increases as cover increases]. 2. . . . protection of reinforcement against erosion.
Design Aids

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Design Process a 0.85 f’ c C = 0.85f’ c (a)(b) T = A s f y d A s d – a/2 M n = 0.85f’ c ab (d – a/2) or ΦMn = Φ[0.85f’ c ab (d – a/2)] Eq. 1 from T = C: A s f y = 0.85f’ c (a)(b) a = A s f y / 0.85f’ c (b) a = ρf y d/0.85f’ c Eq. 2 ρ= A s /bd b

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Design Process…more Combining Eqs. 1 & 2: ΦM n = Φ[ρf y bd 2 (1 – 0.59ρf y /f’ c )] Define R as ρf y (1 – 0.59ρf

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• Spring '18
• Cousins
• American Concrete Institute, efficient cross sections

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