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eng.slab-two-way-moment Calculator
Calculates two-way slab design moments and required reinforcement using the Direct Design Method of ACI 318. Two-way slab moment coefficients from ACI 318 Table 8.10.4 depend on column strip vs. middle strip and span ratio.
Inputs
Lx M
Distance between supports (m). Longer spans experience larger bending moments — structural adequacy must be rechecked.
Ly M
Distance between supports (m). Longer spans experience larger bending moments — structural adequacy must be rechecked.
W Kpa
A multiplier applied in the calculation.
Cx
Reference formula or conversion factor shown for context.
Cy
Reference formula or conversion factor shown for context.
Results
moment Mx (kN·m/m) — short direction
The computed direction or bearing, typically in degrees from north or as a cardinal direction.
moment My (kN·m/m) — long direction
The computed direction or bearing, typically in degrees from north or as a cardinal direction.
Ly/Lx ratio
The proportional relationship between two quantities.
two-way action?
Sample size or count used in the calculation.
method
The recommended calculation method or analytical approach for these conditions.
Mx = Cx·w·Lx² My = Cy·w·Ly²
Reference formula or conversion factor shown for context.