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As'= area of the compression reinforcement, in2
b = width of compression face of member, in.
d= distance from extreme compression fiber to centroid of logitudinal longitudinal tension reinforcement, in.
ρ' = ratio of As' to bd
ξ = time-dependent favtor factor for sustained load
λΔ = multiplier used for additional deflection due to long-term effects
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Time-dependent factor ξ is 2.0 in accordance with ACI Table 24.2.4.1.3
Sustained load duration, months | Time-dependent factor, ξ |
|---|---|
3 | 1.0 |
6 | 1.2 |
12 | 1.4 |
60 or more | 2.0 |
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