3.8 The cross section of a 17-ft (5-m)-span simply supported beam is 10 x 28 in. (250 x 700 mm), and it is reinforced symmetrically with eight no. 6 bars (8 x 20 mm) in two rows. Determine the allowable concentrated live load at midspan considering the total acting dead load (including self-weight) is equal to 2.55 K/ft (37 kN/m). Given: f = 3 ksi (20 MPa) and f, = 40 ksi (300 MPa).