Two-Way Slab Bending Moments

Placa Tip 6 — Fixed supporting condition on all edges

1  Slab Geometry & Loading
Slab Properties
cmslab depth
kN/m³unit weight
Loads
kN/m²superimposed dead load
kN/m²live load
ULS Load Coefficients
permanent load factor
variable load factor
ULS Design Load
q= Gk·(d·γRC+qSDL) + Qk·qLL
14.063kN/m²
Slab Dimensions
mspan direction 1
mspan direction 2
1.000= l2 / l1
Figure 1 — Slab plan with fixed edges & bending moments
2  Coefficient Table — Placa Tip 6

Interpolated coefficients for the span ratio λ = l2/l1. Highlighted row shows the interpolated values used.

λα61α62β61β62
Interpolated Coefficients
0.0179
0.0179
0.5000
0.5000
3  Bending Moment Calculation
Mid-span Moments (Sagging)
M1= α61 · q · l1²=7.614kN·m/m
M2= α62 · q · l2²=7.614kN·m/m
Support Moments (Hogging)
M'1= −β61·q·l1² / 12=−17.725kN·m/m
M'2= −β62·q·l2² / 12=−17.725kN·m/m
Mid-span M1 (direction 1)
7.61 kN·m/m
Mid-span M2 (direction 2)
7.61 kN·m/m
Support M'1 (direction 1)
−17.73 kN·m/m
Support M'2 (direction 2)
−17.73 kN·m/m
Reference: Two-way slab analysis — Placa Tip 6 (fixed on all edges). Coefficients per standard tables for rectangular slabs with fixed boundary conditions.