Figure P4-1 shows a simply supported beam and the cross section at midspan. The

Question

Figure P4-1 shows a simply supported beam and the cross section at midspan. The beam supports a uniform service (unfactored) dead load consisting of its own weight plus 1.4 kips/ft and a uniform service (unfactored) live load of 1.5 kips/ft. The concrete strength is 3500 psi, and the yield strength of the reinforcement is 60,000 psi. The concrete is normal-weight concrete. Use load and strength-reduction factors from ACI Code Sections 9.2 and 9.3. For the midspan section shown in Fig. P4-lb, compute phi Mn and show that it exceeds Mu.

Explanation / Answer

I need to know the width of beam cross section is not shown in figure b.

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