How to calculate SF and BM?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
To calculate shear force and bending moment:
- Draw free body diagram of the beam
- Calculate reactions at supports (ΣF = 0, ΣM = 0)
- Cut sections at points of interest
- Apply equilibrium:
- SF: Sum vertical forces
- BM: Sum moments about cut point
- Plot SF and BM diagrams
Use integration: BM = ∫SF dx
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