Example 2: nominal strength for rectangular beam with two layer of reinforcing steel

determine the nominal or theoretical moment capacity Mn for beam in figure 1 if fy= 60,000 psi and fc’= 4000 psi.

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Figure 1

Mn=As.fy*(d-a/2)C=T0.85fc’*a*b=As*fya=(As*fy)/(0.85fc’*b)a=(6*1.27*60,000)/(0.85*4000*18)a=7.47inMn=As.fy*(d-a/2)Mn=7.62*60,000*(26-7.47/2)=10,179,558 lb-in=848.2965k-ft

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Figure 2

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