5 Berekening op sterkte - hout Voor hout: H = 1/20L = 1/20 (9000) = 450 mm B = 1/60L = 1/60(9000) = 150 mm W = 1/6 * 150 * 450 2 = 5063 * 10 3 mm 3 σ = M/W = 105 * 10 6 / 5063 * 10 3 = 20.7 N/mm 2 U.C.