Flexural Reinforced Concrete Members 309 14.15 Design the beam for the floor shown in Figure P14.9. The service dead load (excluding beam weight) is 100 psf and live load is 300 psf. 3,000 psi, f, = 40,000 psi. 14.16 A9 in. thick one-way interior slab supports a service live load of 500 psf on a simple span of 15 ft. The main reinforcement consists of #7 size bars at 7 in. on center. Check whether the slab can support the load in addition to its own weight. Use f = 3,000 psi. f, = 60,000 psi. 14.17 A one-way interior slab shown in Figure P14.10 spans 12 ft. Determine the service load that the slab can carry in addition to its own weight. f = 3,000 psi. f, 40,000 psi. 14.18 A one-way slab, exposed to the weather, has a thickness of 9 in. The main reinforcement consists of # 8 size bars at 7 in. on center. The slab carries a dead load of 500 psf in addi- tion to its own weight on a span of 10 ft. What is the service live load that the slab can carry? f=4,000 psi, f, = 60,000 psi. 14.19 A 8 1/2 in. thick one-way slab interior spans 10 ft. It was designed with the reinforcement of #6 size bars at 6.5 in. on center, to be placed with a cover of 0.75 in. However, the same steel was misplaced at a clear distance of 2 in. from the bottom. How much is the reduc- tion in the capacity of the slab reduced to carry the superimposed service live load in addition to its own weight? f=4,000 psi, f, = 60,000 psi. 14.20 Design a simply supported one-way interior slab to span 15 ft. and to support the service dead and live loads of 150 and 250 psf in addition to its own weight. Sketch the design. f=4,000 psi, f, = 50,000 psi. 14.21 Design the concrete floor slab shown in Figure P14.11. Sketch the design. f= 3,000 psi, f, 40,000 psi. = 10 ft. * 10 ft. Beam * 10 ft. FIGURE P14.9 Floor system for Problem 14.15. @6 in. c 15 ft. ° 8 in.