Vertical equilibrium audit
Ultimate case 1.5 (DL + LL)
Load applied to frame
2296.9 kN
Σ member UDL × length
Σ support reactions
2296.9 kN
from the 3D solve
Independent hand calculation
2296.9 kN
slab areas + walls + beam self weight
Difference
0.00 %
Slab load is spread to the beams by the 45° yield-line rule, using UDLs that preserve the total panel load (triangle → w·lx/4, trapezoid → w·lx/2·(1 − 1/2β)). This is what STAAD.Pro produces from one-way/two-way floor-load generation, so reactions, column axial forces and shears line up with a STAAD model of the same frame. Column self weight is not part of the frame loading — it is added in the column design step. Live load is taken per room from IS 875 Part 2, not averaged.
Load cases solved
IS 456 Table 18
| Case | DL factor | LL factor | Remark |
|---|---|---|---|
| DL | 1.00 | 0.00 | Dead load alone, unfactored |
| LL | 0.00 | 1.00 | Imposed load alone, IS 875 Pt 2 |
| DL + LL | 1.00 | 1.00 | Service combination, Cl. 22.4 |
| LAT X | 0.00 | 0.00 | Lateral load along X alone (governing of wind / seismic) |
| LAT Y | 0.00 | 0.00 | Lateral load along Y alone |
| 1.5 DL | 1.50 | 0.00 | Ultimate, dead load only — Table 18 |
| 1.5 DL + 1.5 LL | 1.50 | 1.50 | Ultimate limit state — Table 18 |
| 1.2 (DL + LL + LAT X) | 1.20 | 1.20 | Table 18 — gravity with lateral, +X |
| 1.2 (DL + LL − LAT X) | 1.20 | 1.20 | Table 18 — gravity with lateral, −X |
| 1.2 (DL + LL + LAT Y) | 1.20 | 1.20 | Table 18 — gravity with lateral, +Y |
| 1.2 (DL + LL − LAT Y) | 1.20 | 1.20 | Table 18 — gravity with lateral, −Y |
| 1.5 (DL + LAT X) | 1.50 | 0.00 | Table 18 — dead plus lateral, +X |
| 1.5 (DL − LAT X) | 1.50 | 0.00 | Table 18 — dead plus lateral, −X |
| 1.5 (DL + LAT Y) | 1.50 | 0.00 | Table 18 — dead plus lateral, +Y |
| 1.5 (DL − LAT Y) | 1.50 | 0.00 | Table 18 — dead plus lateral, −Y |
| 0.9 DL + 1.5 LAT X | 0.90 | 0.00 | Table 18 — uplift / reversal check, +X |
| 0.9 DL − 1.5 LAT X | 0.90 | 0.00 | Table 18 — uplift / reversal check, −X |
| 0.9 DL + 1.5 LAT Y | 0.90 | 0.00 | Table 18 — uplift / reversal check, +Y |
| 0.9 DL − 1.5 LAT Y | 0.90 | 0.00 | Table 18 — uplift / reversal check, −Y |
Grid line loading
pick a level and a grid line
metres · 0.014 m/px
— — orange dashed = buildable footprint after setbacks■ solid = column at a grid intersection, sized as designedhatched = bay not built on this storey — no slab, beam, column or loadX grid 1,2,3… · Y grid A,B,C…
| Span | L (m) | Slab DL | Slab LL | Wall | Beam self | Service DL+LL | Ultimate 1.5(DL+LL) | Total on span (kN) | Rooms above |
|---|---|---|---|---|---|---|---|---|---|
| S1 | 3.50 | 4.82 | 1.71 | 11.47 | 1.87 | 19.87 | 29.81 | 104.32 | Master bedroom |
| S2 | 3.50 | 4.82 | 1.71 | 11.47 | 1.87 | 19.87 | 29.81 | 104.32 | Bedroom 2 |
| S3 | 3.50 | 4.82 | 1.71 | 11.47 | 1.87 | 19.87 | 29.81 | 104.32 | Bedroom 3 |
All grid lines on this level
quick comparison against your STAAD input
| Grid line | Dir | Type | Spans | Service UDL range (kN/m) | Ultimate UDL range (kN/m) | Σ service load (kN) | Σ ultimate load (kN) |
|---|---|---|---|---|---|---|---|
| Grid A | X | perimeter | 3 | 19.87 – 19.87 | 29.81 – 29.81 | 208.6 | 313.0 |
| Grid B | X | perimeter | 3 | 19.15 – 19.87 | 28.73 – 29.81 | 205.1 | 307.7 |
| Grid C | X | perimeter | 2 | 20.30 – 20.73 | 30.45 – 31.09 | 143.6 | 215.4 |
| Grid 1 | Y | perimeter | 2 | 19.05 – 19.43 | 28.58 – 29.14 | 115.5 | 173.2 |
| Grid 2 | Y | internal | 2 | 17.09 – 18.21 | 25.63 – 27.32 | 105.9 | 158.9 |
| Grid 3 | Y | perimeter | 2 | 17.09 – 19.80 | 25.63 – 29.71 | 110.7 | 166.0 |
| Grid 4 | Y | perimeter | 1 | 19.05 – 19.05 | 28.58 – 28.58 | 57.2 | 85.7 |