Beam deflection worksheet with answers

Free printable Beam deflection worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

A cantilever carries a point load P at its free end. Find the deflection δ at the free end.

P = 2 kNL = 2 mE = 70 GPa (aluminium)I = 8.5 × 10⁶ mm⁴

δ = mm

2.Easy

A simply supported beam carries a point load P at midspan. Find the load P that makes the midspan deflect by 15 mm.

δ = 15 mmL = 5 mE = 70 GPa (aluminium)I = 84 × 10⁶ mm⁴

P = kN

3.Medium

A simply supported beam carries a uniformly distributed load w over its whole span. Find the maximum deflection δ_max, at midspan.

w = 2 kN/mL = 8 mE = 11 GPa (timber)I = 160 × 10⁶ mm⁴

δ_max = mm

4.Medium

A cantilever of length L is fixed at A and carries a point load P at a distance a = 4 m from A. Find the deflection δ_P under the load.

P = 9 kNa = 4 mL = 5 mE = 200 GPa (steel)I = 23 × 10⁶ mm⁴

δ_P = mm

5.Hard

A simply supported timber beam of rectangular section, 75 mm wide, carries a uniformly distributed load w over its whole span. Its midspan deflection may not exceed span/250. Find the smallest depth h_req of the section.

w = 1.5 kN/mL = 4.5 mE = 11 GPa (timber)b = 75 mm

h_req = mm

6.Hard

A simply supported beam carries a uniformly distributed load w. Its deflection may not exceed span/360. Find the smallest second moment of area I_req that meets this limit.

w = 12 kN/mL = 2.5 mE = 70 GPa (aluminium)

I_req = × 10⁶ mm⁴

Answer key

1. δ = 8.964 mm
2. P = 33.87 kN
3. δ_max = 60.61 mm
4. δ_P = 41.74 mm
5. h_req = 186.4 mm
6. I_req = 12.56 × 10⁶ mm⁴

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