. A footbridge is to be built, consisting of a one-way solid slab spanning 16 ft between masonry abutments, as shown in Fig. P12.1. A service live load of 100 psf must be carried. In addition, a 2000 lb concentrated load, assumed to 2" asphalt 16' (a) (b) 6" curb be uniformly distributed across the bridge width, may act at any location on the span. A 2 in. asphalt wearing surface will be used, weighing 20 psf. Precast concrete curbs are attached so as to be nonstructural. Prepare a design for the slab, using material strengths f, = 60,000 psi and f=4000 psi, and summa- rize your results in the form of a sketch showing all concrete dimensions and reinforcement.