How does ideCAD calculate time-dependent deflections according to ACI 318-19?
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Notation
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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According to ACI 24.2.4.1.1. , additional time-dependent deflection resulting from creep and shrinkage of flexural members can be calculated as the product of immediate deflection caused by sustained load and the factor λΔ.
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ρ' is the ratio of the As' , area of the compression reinforcement, to bd
Time-dependent factor ξ is calculated 2.0 in accordance with ACI Table 24.2.4.1.3
Sustained load duration, months | Time-dependent factor, ξ |
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3 |
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1.0 | |
6 | 1.2 |
12 | 1.4 |
60 or more | 2.0 |
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