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Structural Load Calculator (2026) – Slab, Beam & Column Master
Expert Guide
Professional dead and live load estimator for RCC slabs, beams, and columns per IS 875.
⚡ Quick Answer
For a 150mm RCC slab: Dead Load = 0.15m × 25 kN/m³ = 3.75 kN/m². For full structural analysis, visit pro.nirmansutra.com.
🛠️ How It Works
- •Select the structural component (Slab, Beam, or Column) to calculate gravity loads.
- •Enter the geometric dimensions and standard loading assumptions.
- •The tool applies IS 875 dead load constants (Grade 25 concrete) for automatic self-weight calculation.
- •Observe the Factored Load results prepared for direct structural member sizing.
📐 Calculation Formula
RCC Slab DL = Thickness × 25 kN/m³
Beam UDL = (Width × Depth) × 25 + Wall Weight
Factored Load = Total Load × 1.5 (Safety Factor)
📋 Real-Life Example
Example: RCC Column with 20m² tributary area, 3 floors, avg load 12 kN/m²:
1. Floor Load = 12 kN/m².
2. Per floor per columns = 12 × 20 = 240 kN.
3. Total (3 floors) = 720 kN.
4. Column size hint = 300mm × 300mm for this range.
⚠️ Common Mistakes to Avoid
- ✕Forgetting the 1.5 Load Factor — structural design requires a safety multiplier for unforeseen live loads.
- ✕Ignoring floor finish — 1kN/m² of tiles/screed adds 25% extra weight to a typical 125mm slab.
- ✕Using nominal wall weights — 230mm brick walls with plaster weigh significantly more than often assumed (typically 12kN/m for 3m height).
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❓ Frequently Asked Questions
Dead Load = Thickness × Density. For a standard 150mm RCC slab, it is 0.15m × 25 kN/m³ = 3.75 kN/m².
Total Column Load = (Tributary Area × Floor Load × No. of Floors) × 1.5. This accounts for both dead and live loads with a safety factor.
This is the "Partial Safety Factor for Loads" mandated by IS 456 to account for unforeseen loading and material variability.
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