This problem consists of three questions.  A two-story frame…

This problem consists of three questions.  A two-story frame structure is shown in the figure below. The structure has four beams on the first floor and two beams on the second floor that support a slab. The slab on the first floor is uniform and the slab on the second floor has a skylight hole cut in the center.  There are four columns on each floor. Each floor carries 100 pounds per square foot (psf), which includes the weight of the slab.