Determine the epоxy mоdificаtiоn fаctor, ψe, for а rectangular beam with b = 18 in. and d = 22 in., four galvanized No. 6 Grade 60 tension-reinforcement bars placed in the bottom of the beam, and No. 3 Grade 60 stirrups located every 12 in. along the span. Assume 8,000-psi lightweight concrete and a clear cover of 1.75 in.