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You cannot put a unit load at a hinge to determine deflection using the method of virtual work.

The floor system of a gymnasium consists of a 140-mm-thick concrete slab resting on four steel beams (A = 8,700 mm2) that, in turn, are supported by two steel girders (A = 25,300 mm2). Determine the point load acting on girder AD at point C caused by dead load.

Determine the vertical displacement of joint B. Assume A = 2 in.2 and E = 29,000 ksi for each member. Let P = 580 lb and L = 8 ft.

If one were trying to determine the vertical deflection of joint B, what would be the virtual force in member AB?

Determine the vertical reaction force at A. Let P1 = 42.1 kips, P2 = 32.6 kips, and a = b = c = d = 10 ft.

Determine the vertical displacement of joint B. Assume A = 2 in.2 and E = 29,000 ksi for each member. Let P = 470 lb and L = 8 ft.

Determine the beam deflection at point H. Assume that EI = 5.91 × 1010 kN-mm2 is constant.

Determine the beam deflection at point H. Assume that EI = 5.70 × 1010 kN-mm2 is constant.

Determine the magnitude of the reaction moment at A. Let P1 = 48.1 kips, P2 = 42.3 kips, and a = b = c = d = 8 ft.

Determine the beam deflection at point H. Assume that EI = 2.71 × 1010 kN-mm2 is constant.