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Which of the following statements best describes Erickson’s Theory of development?

Use the portal method to determine the magnitude of the approximate axial force in girder HI. Let P1 = 20.5 kN, P2 = 43.5 kN, L1 = 9 m, L2 = 6 m, and L3 = 7 m.

Use Robot to determine the force in member AD. Use a consistent material and cross section for the truss members. Delete the self-weight of the members. Let P = 25 kN, L1 = 5 m, and L2 = 3 m.

Use Robot to determine the magnitude of the vertical reaction force at A. Assume that M = 210 kN·m, P = 75 kN, w = 70 kN/m, and L = 1.6 m. Delete the self-weight of the beam.

Use Robot to determine the magnitude of the vertical reaction force at A. Assume that M = 160 kN·m, P = 80 kN, w = 85 kN/m, and L = 1.7 m. Delete the self-weight of the beam.

Use Robot to determine the magnitude of the vertical reaction force at A. Let w = 30 kN/m, and L = 8 m. Delete the self-weight of the beam.

Identify the moment equation that corresponds to MCB. Let w = 3.7 kip/ft, L1 = 20 ft, and L2 = 16 ft. Assume EI = constant.

Use Robot to determine the magnitude of the axial force in column FI. Assume each member is a steel W16x40, but delete the self-weight of the members. Let P1 = 22.0 kN, P2 = 36.0 kN, L1 = 10 m, L2 = 7 m, and L3 = 7 m.

Use Robot to determine the force in member AD. Use a consistent material and cross section for the truss members. Delete the self-weight of the members. Let P = 17 kN, L1 = 6 m, and L2 = 4 m.

Using the slope-deflection equations below, determine the beam slope at C. Let P1 = 15 kips, P2 = 12 kips, L1 = 18 ft, L2 = 10 ft, and L3 = 14 ft. Assume EI = constant.MAC = EIθC / 14 + 34.44MCA = EIθC / 7 + –61.99MCE = EIθC / 7 + 42MEC = EIθC / 14 + –42