Question

For the beam shown use f-3000 psi and fy 60000 psi. 1- Compute the effective flange width 2- Compute фМ, for the positive and negative moment regions and check ACI requirements for both sections. At the support, the bottom bars are in one layer and at mid-span, the # 8 bars are in the bottom layer and the # 7 bars are in a second layer. Assume 2.5 in concrete cover (from outside face of concrete to the center of steel in compression, one layer) and 2.5 in (from outside face of concrete to the center of the bottom steel layer in tension) with 2.0 in c/c between steel layers. ft-6 in 11 ft 21 in 6 in. 18 in. 12 in 12 in Support (negative bending) Midspan (positive bending) 7 No. 7 bars 3 No.8 plus 2 No. 7 bars at midspan 22 ft 2 No. 8 bars at ends

Answer 1

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