Select the reinforcement bars for the following section shown if the ultimate moment applied to the beam is 150 k.ft., steel yield stress is 60 ksi, and concrete compressive strength is 4000 psi. (Hint: assume the distance from the c.g. of the tensile steel to the c.g. of the compression block equals 0.9 times the effective depth, d, of the beam). After steel is computed, check the assumed distance and revise the steel area if necessary. Is &>0.005? -5-|--|--| 15 in.- 6 in. 18 in.