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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.

Figure 1         







Mn=As.fy*(d-a/2)

C=T
0.85fc'*a*b=As*fy
a=(As*fy)/(0.85fc'*b)
a=(6*1.27*60,000)/(0.85*4000*18)
a=7.47in

Mn=As.fy*(d-a/2)
Mn=7.62*60,000*(26-7.47/2)=10,179,558 lb-in=848.2965k-ft

figure 2 



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