Tools › User guides › Building Load Analysis
The Building Load Analysis calculator works out dead and live loads (IS 875 Parts 1–2), wind (Part 3) and seismic base shear and storey forces (IS 1893, equivalent static method) for a building, and designs a typical slab, beam, column and footing to IS 456 under 1.5(DL + LL), with a summary schedule.
Open the Building Load Analysis ›
| Field | What to enter | Typical value | Tip |
|---|---|---|---|
| Project name, City | City sets the basic wind speed. | ||
| Storeys above ground, floor height, plan L × B | 4, 3.0 m, 15 × 10 m | ||
| Concrete, steel, link grades; unit weight of RCC | M25, Fe 500, Fe 415; 25 kN/m³ | ||
| Safe bearing capacity | From the soil report. | ||
| Slab thickness, beam b × D, column sizes | Trial sizes. | 125; 230 × 450; 230 × 450 | |
| Covers — slab, beam, column, footing | 20 / 25 / 40 / 50 mm |
| Field | What to enter | Typical value | Tip |
|---|---|---|---|
| Floor finish thickness / unit weight | 50 mm, 24 kN/m³ | ||
| Ceiling plaster thickness / unit weight | 12 mm, 20.4 kN/m³ | ||
| Services allowance | 0.5 kN/m² | ||
| External / internal wall thickness, masonry unit weight, plaster | 230 / 115 mm, 20 kN/m³, 24 mm | ||
| Opening reduction factor | Wall area left after openings. | 0.85 | |
| Roof waterproofing | 2.0 kN/m² | ||
| Occupancy; corridor / balcony LL | IS 875 Part 2. | Residential; 3.0 kN/m² | Column LL is reduced 10 % per floor carried, max 50 %. |
| Field | What to enter | Typical value | Tip |
|---|---|---|---|
| k1, terrain, k3, k4, Kd, Ka, Kc, Cf | IS 875 Part 3:2015 factors. | k1 1.0, terrain 2, 0.9, 0.9, 0.9, Cf 1.2 | |
| Seismic zone, importance I, R, soil type, building type | IS 1893 Part 1:2016. | Zone III, I 1.0, R 5 (SMRF), soil II | |
| Columns per floor, beam length, external / internal wall length per floor | For the seismic weight. | 25 % LL in the seismic weight when LL ≤ 3 kN/m²; roof LL not included. |
| Field | What to enter | Typical value | Tip |
|---|---|---|---|
| Slab: lx, ly, panel case (Table 26), bar dia & spacing, basic span/depth, kt | 3.6 × 4.8 m; 26; kt 1.4 | ||
| Beam: effective span, support condition, bars, stirrups | 4.8 m; 5 bars; 2-legged | ||
| Column: effective length factor k, tributary area, beam and wall load per floor, bars, tie pitch | k 0.8; 16 m² | ||
| Footing: self-weight allowance, L × B, depth, bars | 10 %; 2 × 2 m; 500 mm |
Results: loads, seismic base shear and storey forces, slab, beam, column and footing design checks and a summary schedule. Use Print / save as PDF. The members are designed for gravity 1.5(DL + LL) only — the lateral forces are worked out but not distributed to individual members (use the Building Frame Designer for that).
It works out the base shear and storey forces, but designs the members for 1.5(DL + LL) only. For earthquake design of every member use the free Building Frame Designer.
IS 875 Part 2 allows 10 % reduction per floor carried, up to 50 %, except where the live load exceeds 5 kN/m².