How to calculate beam size?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
Beam sizing involves:
- Determine loads: Dead load, live load, point loads
- Calculate maximum BM: From load analysis
- Select material: Steel, concrete, wood (with allowable stress)
- Use formula: Section modulus Z = M_max / σ_allowable
- Choose standard size: Match or exceed required Z
Consider deflection limits: δ = (5wL⁴)/(384EI) for uniformly loaded beam.
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