If the displacements of all the joints of a structure are either zero or known, the structure is considered to be _______.

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 magnitude of the vertical reaction force at A. Let w = 27 kN/m, and L = 8 m. Delete the self-weight of the beam.

Use the portal method to determine the magnitude of the approximate shear in column CG. Let P1 = 24 kN, P2 = 54 kN, L1 = 8 m, L2 = 5 m, L3 = 7 m, and L4 = 4 m.

Use Robot to determine the magnitude of the beam deflection at A for a steel W16x40 beam. Include the self-weight of the beam. Let w = 3.6 kips/ft, P = 50 kips, L1 = 10 ft, and L2 = 15 ft.

Use Robot to determine the magnitude of the vertical reaction force at A. Let w = 23 kN/m, and L = 8 m. Delete the self-weight of the beam.

Use Robot to determine the magnitude of the vertical reaction force at A. Assume that M = 170 kN·m, P = 85 kN, w = 65 kN/m, and L = 1.8 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 = 90 kN, w = 85 kN/m, and L = 1.4 m. Delete the self-weight of the beam.

Determine the magnitude of the bending moment at C. Let w = 1.5 kip/ft and L = 21 ft. Assume EI = constant.

Use the portal method to determine the magnitude of the approximate shear in column AD. Let P1 = 20 kN, P2 = 44 kN, L1 = 10 m, L2 = 6 m, and L3 = 7 m.