Chapter 14, Problem 14.7PFS

Determine forces in members BC, GF and CG and nature of forces 9 m D 4 m C 4m 500 F 4 kN 6 kN 4 m 3 m B3 G E Assignment-2 A

Find forces in all members of the truss shown in Fig. Also find reactions at supports. 12 kN 20 kN ΙΟΧΟΙΟΙ 2 m 2 m 2 m 3 m C G E 4 m B Determine forces in members BC, GF and CG and nature of forces 9 m D 4 m C 4 m F 4 kN 6 kN 4 m 3 m B3 C E Assignment-2

Part 3: Problem-Solving. Solve the following problems. Show all calculations. 1. A retaining wall 5.80m high supports soil that has the following properties: Unit weight = 17.3 kN/m³ Angle of internal friction = 26 deg. Cohesion = 14.5 kPa a) Calculate the normal pressure acting at the back of the wall assuming no tensile crack occurs in the soil. b) Find the location of the tensile crack measured from the surface of horizontal backfill. c) Determine the active pressure acting on the wall in tensile crack occurs in the soil. 2. The soil material is supported by a retaining wall to a height of 6m. The unit weight of the soil is 16 kN/m³ and the angle of internal friction is 29 deg. Assume the soil is cohesionless. a) Determine the earth pressure on the wall. b) Find the total active pressure if surcharge of 14 kPa is applied on the surface of horizontal backfill. c) Locate the position of the total pressure from the bottom.