Minimum and maximum length between straps to lift the beam without cracking. Concrete f_c = 4000 psi. The steel reinforcing is three #8 bars and two #6 bars in a row as shown in cross-section A-A.

The precast reinforced concrete beam with the cross-section shown is to be lifted in the laboratory using a spreader beam and straps as illustrated below, If the beam length, L, is 52 ft, determine the minimum and maximum length between the straps, C, that may be used to lift the beam without cracking it. The reinforcement is 3 #8 and 2 #6 bars in one row, Hint: First you need to calculate the positive and negative Mar (moment to cause the beam to experience the first flexural cracking). 15 27.5 Straps- R/C Beam 3-88's and 2-46's Cross Section A-A