Slab design
Based on AS3600 2018
Table of Contents
Image
Slab parameters
Slab width
Slab depth
Top reo
Bottom reo
Cover
Effective depth
Axis depth
Number bars
Area steel
Reinforcement ratio
Material properties
Concrete strength
Concrete ult. strain, εcu
α2 , γ
Steel strength
Steel modulus
Steel ult. strain, εsu
Steel density
Bending capacity
Applied moment, M*
Neutral axis parameter, ku
Plastic neutral axis, dn
Moment capacity, Muo
Capacity reduction factor, Φ
Design moment capacity, ΦMuo
Moment check, M*/ΦMuo
Crack control
| Type | Bar dia. (mm) | Spacing (mm) | Rate (mm2/m) |
|---|---|---|---|
| SL72 | 6.75 | 200 | 179 |
| SL82 | 7.60 | 200 | 227 |
| SL92 | 8.55 | 200 | 287 |
| SL102 | 9.50 | 200 | 352 |
| SL81 | 7.60 | 100 | 454 |
| N12-200 | 12 | 200 | 565 |
| N16-200 | 16 | 200 | 1005 |
Average prestress, σcp
Area steel
Reinforcement for crack control in secondary direction (unrestrained slab)
Minimum (1.75-2.5σcp)bD-3
Reinforcement for crack control in secondary direction (restrained slab)
Minor (1.75-2.5σcp)bD-3
Moderate (3.5-2.5σcp)bD-3
Strong (6.0-2.5σcp)bD-3
*Note, for exposure classification B1, B2, C1, C2 a strong degree of crack control is always required
Tonnage
One way
Rate
Two way
Rate
*Assuming same reo in secondary direction