7.2.To save steel-handling costs, an alternative design is proposed for the beam in Problem 7.1, using two No. 9 (No. 29) Grade 80 bars to provide approximately the same steel strength as the originally proposed four No. 7 (No. 22)Grade 60 bars. Check to determine if the redesigned beam is satisfactory with respect to cracking according to the ACI Code. What modification could you suggest that would minimize the number of bars to reduce cost, yet satisfy requirements of crack control?

Fig: 1