StrucLab
| Project | — | Job No. | — |
| Calculation | Gravity Load Takedown — 2 columns | By | — |
| Reference | AS/NZS 1170.0 & 1170.1 | Date | 23 May 2026 |
Gravity Load Takedown — Multi-Column
AS/NZS 1170.0 & 1170.1 · One floor schedule, multiple columns · Cumulative G & Q with live-load area reduction
One row = one floor, top → bottom. Each column has its own tributary area per floor (A columns). Units: m, m², kPa. Tick "Reduce Q" to apply the live-load area reduction (ψa = 0.3 + 3/√A) to that floor.
| Floor | Roof | hm | A · C1m² | A · C2m² | G (SDL)kPa | QkPa | ψl | ψs | Reduce Q | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | |||||||||||
| 2 | |||||||||||
| 3 | |||||||||||
| 4 |
2,896Σ governing ULS, all columns (kN)
1,990Σ SLS, all columns (kN)
2Columns
Column C1
Governing ULS 1,447.8 kN · SLS 995.1 kN
| Floor | A (m²) | ψa | G floor | Q floor | ΣG | ΣQ | 1.35G | 1.2G+1.5Q | 1.2G+1.5ψl·Q | SLS |
|---|---|---|---|---|---|---|---|---|---|---|
| RoofROOF | 40.0 | 0.774 | 140.0 | 46.5 | 140.0 | 46.5 | 189.0 | 237.7 | 168.0 | 140.0 |
| L3 | 40.0 | 0.774 | 220.0 | 92.9 | 360.0 | 139.4 | 486.0 | 641.1 | 487.8 | 425.0 |
| L2 | 40.0 | 0.774 | 220.0 | 92.9 | 580.0 | 232.3 | 783.0 | 1,044.5 | 807.5 | 710.1 |
| L1 | 40.0 | 0.774 | 220.0 | 92.9 | 800.0 | 325.2 | 1,080.0 | 1,447.8 | 1,127.3 | 995.1 |
| FOOTING (C1) | 800.0 | 325.2 | 1,080.0 | 1,447.8 | 1,127.3 | 995.1 | ||||
Column C2
Governing ULS 1,447.8 kN · SLS 995.1 kN
| Floor | A (m²) | ψa | G floor | Q floor | ΣG | ΣQ | 1.35G | 1.2G+1.5Q | 1.2G+1.5ψl·Q | SLS |
|---|---|---|---|---|---|---|---|---|---|---|
| RoofROOF | 40.0 | 0.774 | 140.0 | 46.5 | 140.0 | 46.5 | 189.0 | 237.7 | 168.0 | 140.0 |
| L3 | 40.0 | 0.774 | 220.0 | 92.9 | 360.0 | 139.4 | 486.0 | 641.1 | 487.8 | 425.0 |
| L2 | 40.0 | 0.774 | 220.0 | 92.9 | 580.0 | 232.3 | 783.0 | 1,044.5 | 807.5 | 710.1 |
| L1 | 40.0 | 0.774 | 220.0 | 92.9 | 800.0 | 325.2 | 1,080.0 | 1,447.8 | 1,127.3 | 995.1 |
| FOOTING (C2) | 800.0 | 325.2 | 1,080.0 | 1,447.8 | 1,127.3 | 995.1 | ||||