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 o' = 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 ơall =170 MN/m?. c. Determine the maximum moment for the middletwo wales.