Problem #3: Figure 1 shows a floor plan consisting of a one-way slab spanning be

Question

Problem #3: Figure 1 shows a floor plan consisting of a one-way slab spanning between beams on grid lines A, B, C, and D. The beams are supported by columns at the intersections of the grid lines. The slab supports a service dead and live load of 100 psf and 75 psf, respectively a) Determine the effective flange width for the continuous beam along grid line B at mid-span between grid lines 1 and 2. Assume hy 5 in. b) Determine the effective flange width for the continuous beam along grid line B at the column support B2. Assume n 5 in

Explanation / Answer

a) at midspan, moment will be positive,i.e., top flange will be in compression. Hence beam wil behave as flanged beam

Per ACI 318 the effective flange width is governed by minimum of the values below:

- span/4 = 18/4 = 4.5'

- 2*1/2*clear distance of web + web width = 20'

- 2x6xhf + 12 = 72" = 6'

Therfore,effective flange width = 4.5' = 54"

b) At column support, there will be negative moment and hence the beam will behave as a rectangular beam. Effective flange width = web width = 12"

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