A reinforced concrete beam having the cross section shown is on a simple span of

Question

A reinforced concrete beam having the cross section shown is on a simple span of 28ft. It carries uniform service loads of 3.60 kips/ft live load and 2.20 kips/ft dead load. Check the adequacy of the beam with respect to the moment. Use f1c= 3000 psi and fy=40,000psi.

a) Reinforcing is six No. 10 bars

b) Reinforcing is six No. 11 bars

cross section is 20X45" 20" width 42" from top down to reinforcing bars and 3" from bottom up to reinforcing bars

I am looking for step by step how to solve this problem.

Answers in the back of the book are:

Mu = 939 ft. kips

a) thetaMn = 894 Kips (no good)

b) thetaMn = 1072 Kips (ok)

I have tried the problem several times but can not get to those answers.

Explanation / Answer

Can you please attach the diagram??

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