1. Six beams with the cross section shown in the figure are made of different materials. Beam 1 is constructed with concrete of compressive strength of 3,000 psi and three #9 reinforcing steel bars with yield strength of 60 ksi. 27" b. Beam 2 is constructed with concrete of compressive strength of 4,000 psi and three #9 reinforcing steel bars with yield strength of 60 ksi. C. Beam 3 is constructed with concrete of compressive strength of 5,000 psi and three #9 reinforcing steel bars with yield strength of 60 ksi. d. Beam 4 is constructed with concrete of compressive strength of 4,000 psi and two #9 reinforcing steel bars with yield strength of 60 ksi. e. Beam 5 is constructed with concrete of compressive strength of 4,000 psi and four #9 reinforcing steel bars with yield strength of 60 ksi. f. Beam 6 is constructed with concrete of compressive strength of 4,000 psi and three #9 reinforcing steel bars with yield strength of 40 ksi. g. Beam 7 is constructed with concrete of compressive strength of 4,000 psi and three #9 reinforcing steel bars with yield strength of 80 ksi. ompute the nominal moment capacities, Mn, and the design moment qMn, of the four beams and omment on the effect of the material properties and rebar selection on the flexural strength of the beams. 15" 0000 24"

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