1. Compute the absolute maximum shear and moment produced in a simply supported beam by two concentrated live loads of 20 kips spaced 10 ft apart. The beam span is 30 ft.
2. Draw the envelopes for maximum shear and moment in a 24-ft-long simply supported beam produced by a live load that consists of both a uniformly distributed load of 0.4 kip/ft of variable length and a concentrated load of 10 kips (Figure P12.42). The 10-kip load can act at any point. Compute values of the envelope at the supports, quarter points, and midspan.