Answer to Question #245631 in Physics for Toby

Question

1. A rectangular timber tie, 180 mm by 80 mm, is reinforced by a bar of aluminium of 25 mm diameter. Calculate the stresses in the timber and reinforcement when the tie carries an axial load of 300 kN. E for timber 15 GN/m²; E for aluminium = 90 GN/m².

(17.8 MN/m²; 106.8 MN/m²)

2. A concrete column having modulus of elasticity 20 GN/m² is reinforced by two steel bars of 25 mm diameter having a modulus of 200 GN/m². Calculate the dimensions of a square section strut if the stress in the concrete is not to exceed 7 MN/m² and the load is to be 400 kN.

Answer 1

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