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(b) (c) As shown in Figure Q2(b), a concrete floor slab is reinforced by 16 mm diameter steel rods placed 38 mm above the lower face of the slab and spaced 150 mm on centres. The modulus of elasticities are 25 GPa and 200 GPa for concrete and steel, respectively. Knowing that a bending moment of 4.5 kNm is applied to each 0.3 m width of the slab, determine: (i) The maximum stress in the concrete. (ii) The stress in the steel. (i) (ii) (5 marks) The thin-walled extruded beam shown in Figure Q2(e) is made of aluminium and has a uniform 3 mm wall thickness. Knowing that the shear in the beam is 5 kN, determine: (5 marks) The shearing stress at point A. The maximum shearing stress in the beam. (5 marks) (5 marks)
(b) (c) As shown in Figure Q2(b), a concrete floor slab is reinforced by 16 mm diameter steel rods placed 38 mm above the lower face of the slab and spaced 150 mm on centres. The modulus of elasticities are 25 GPa and 200 GPa for concrete and steel, respectively. Knowing that a bending moment of 4.5 kNm is applied to each 0.3 m width of the slab, determine: (i) The maximum stress in the concrete. (ii) The stress in the steel. (i) (ii) (5 marks) The thin-walled extruded beam shown in Figure Q2(e) is made of aluminium and has a uniform 3 mm wall thickness. Knowing that the shear in the beam is 5 kN, determine: (5 marks) The shearing stress at point A. The maximum shearing stress in the beam. (5 marks) (5 marks)
60mm 25mm 25mm FIGURE Q2(c) 5kN B