A reinforced concrete T-beam (see figure) is acted on by a positive bending moment of M =
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A reinforced concrete T-beam (see figure) is acted on by a positive bending moment of M = 175 kip-ft. Steel reinforcement consists of four bars of 1.41-inch diameter. The modulus of elasticity for the concrete is Ec = 3000 ksi while that of the steel is Es = 29,000 ksi. Let b = 48 in., tf = 4 in., bw =15 in., and d = 24 in.
(a) Find the maximum stresses in steel and concrete.
(b) If allowable stresses for concrete and steel are σac = 1400 psi and σas = 18 ksi, respectively, what is the maximum permissible positive bending moment?
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