A 5 m wide and 12 m deep braced excavation is carried out in sand, as shown in Figure P19.2, where y =18 kn m3 and 0=37. The struts are

placed at horizontal spacing of 2.5 m a. Determine the strut loads. b. Determine the required section modulus of the sheet-pile section, assuming ou170 MN/m?. c. Determine the maximum moment for the middle two wales.