T-Beams are used to support a floor in an industrial building. The floor is used

Question

T-Beams are used to support a floor in an industrial building. The floor is used for product storage so it must be designed for a heavy 600 psf. The floor must also support a superimposed dead load of 20 psf (in addition to the self-weight of the beams and slab. The layout of the beams and slabs is shown below. The beams span 30’-0” and are spaced at 4’-0” center to center. The slab is 3” thick. The concrete compressive strength is f’c = 3000 psi and the steel yield strength is fy = 60 ksi. The concrete is an interior exposure (not exposed to weather) and the reinforcing steel will be enclosed in #3 stirrups. (USING ACI 318-14 CODE BOOK)

What is the maximum number of #7 bars that could be located in a single layer in the beam?

7

8

6

9

7

8

6

9

Explanation / Answer

For the web width of 18", the maximum number of bars that can be accommodated in a single layer is 7-#7.

The overall width for 7-#7 bars is 16.5" [<18"]. Hence, it is Okay.

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