Abeam with the following cross section is constructed with concrete of compressive strength of 4,000 psi and three fiberglass reinforcing bars each having a cross sectional area of 0.18 in.2 the bars are elastic with a modulus of 8,000 ksi until they fail in a brittle manner at a strain of 1.2%. a. estimate the mode of failure for the beam at the ultimate condition. is it desirable? justify your answer. b. calculate the nominal moment capacity, μn. c. what strength reduction factor, φ, would you use to calculate the factored design moment?