The box section shown in Figure Q3 is formed from Two 305 x 102 channel sections connected by two 300 mm x 10 mm cover plate. Each of the channel sections has a second moment of area about the neutral axis of 65.87 x 106 mm4. The section is to be used as a cantilever, 8.0 m long and carrying a distributed load which varies linearly from 35 kN/m at the fixed end to zero at the free end. 10 (v) Calculate the maximum shear stress and sketch the shear stress distribution (no calculation required for the shear distribution sketch). [5 marks] 15 (i) Locate the centroid of the section. (ii) Calculate the second moment of area about the Neutral Axis. (iii) Calculate the elastic section modulus. (iv) [3 marks] [4marks] [2 marks] Calculate the maximum tensile and compressive stress due to the applied bending moment. [6 marks] HHH 15 10 HI 100 15 100 300 100 15 275 w = 35 kN/m 4.0m 4.0m