a rectangular beam with a width of a 8 in. an effective depth of 10 in., and a total depth of 12 in., is reinforced with a single fiberglass reinforcing bar that has a cross sectional area of 0.45 in^2. the bar has a nominal tensile strength of 14000 psi, a linear stress-strain curve to failure, and a strain at failure of 1.8 percent determine the nominal flextural strength of the section