NCEES Civil PE Specification Structural Mechanics: Bending
Problem
Consider a rectangular concrete beam designed for a bending moment of \(M_u = 150 ft-kips\). The beam has a width \(b = 12\) in and an effective depth \(d = 20 in\). The beam's steel reinforcement consists of Grade 60 bars with \(f_y = 60 ksi\) and the area of steel provided is \(A_s = 3.0 in^2\). If the specified compressive strength of concrete is \(f'_c = 4 ksi\), calculate the depth of the equivalent compression block, a, in inches.
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