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{"ops":[{"insert":"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\/m\u00b2; E for aluminium = 90 GN\/m\u00b2.\n\n(17.8 MN\/m\u00b2; 106.8 MN\/m\u00b2)\n\n2. A concrete column having modulus of elasticity 20 GN\/m\u00b2 is reinforced by two steel bars of 25 mm diameter having a modulus of 200 GN\/m\u00b2. Calculate the dimensions of a square section strut if the stress in the concrete is not to exceed 7 MN\/m\u00b2 and the load is to be 400 kN.\n"}]}
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