CSI SAFE - 25 Concrete Slab Short term and Long term Deflection Calculations

Deflection:
the action or process of deflecting or being deflected.

The deflection distance of a member under a load is directly related to the slope of the deflected shape of the member under that load, and can be calculated by integrating the function that mathematically describes the slope of the member under that load.

)))))) Short and Long term deflections

Three types of deflections are available, including:
1. Elastic Deflection
2. Immediate cracked deflection
3. Long-term cracked deflection accounting for creep and shrinkage

For Elastic Deflection
Section uncracked used
Load Combination = 1D (Dead) +1L (Live) +1SD (Super Dead)

)) For Immediate (Short term) cracked deflection
Section cracked used
Load Combination = 1D (Dead) +1L (Live) +1SD (Super Dead)

)) For Long term deflection
Section cracked used (with creep and shrinkage)
Load Combination (Sustained)= 1D (Dead) +0.25 L (Live) +1SD (Super Dead) → we consider 25 % live load as sustained load.

But with doing so, we are missing with rest of 75% live load deflection.
For Accommodation of 75% live load
Long term Deflection Combination
= (1D +0.25 L +1SD {with C & Sh}) +[1D +1L +1SD] -[1D +0.25L +1SD]

)) Allowable Deflections:

Immediate Deflection = Span /360
Long term deflection = Span /250

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