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Where would you apply a unit load to determine the horizontal deflection at point D?

Support settlements do not cause any stresses in indeterminate structures.

The beam supports a uniform live load of 427 lb/ft. Determine the maximum negative shear that can be developed at point B. Assume the support at A is a pin and C is a roller. The influence lines for VB and MB are shown, along with the peak values of the influence lines.

On this quiz, “maximum” refers to the highest vertical point on the influence graph and “minimum” refers to the lowest vertical point on the graph.Draw the influence line for the vertical reaction at C. What is the line’s minimum value? Let L1 = 4 m and L2 = 8 m.

Determine the slope at A that would be caused by the concentrated force if the fixed support was a pin support, instead. Let P = 172 lb, a = 48 in., and EI = 36 × 106 lb·in.2.

The beam supports a single live load of 2,130 lb. Determine the maximum positive shear that can be developed at point B. Assume the support at A is a pin and C is a roller. The influence lines for VB and MB are shown, along with the peak values of the influence lines.

Assuming that the live loads are transmitted to the bottom chords of the truss, draw the influence line for the force in member BC. What is the line’s maximum value? Let L = 12 ft.

The beam supports a single live load of 2,000 lb, a uniform live load of 300 lb/ft, a uniform dead load of 200 lb/ft. Determine the maximum positive moment that can be developed at point B. Assume the support at A is a pin and C is a roller. The influence lines for VB and MB are shown, along with the peak values of the influence lines.

Determine the slope at A that would be caused by the distributed load if the fixed support was a pin support, instead. Let w = 2 lb/in., a = 100 in., and EI = 97 × 106 lb·in.2.

Assuming that the live loads are transmitted to the bottom chords of the truss, draw the influence line for the force in member BC. What is the line’s minimum value? Let L = 14 ft.