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, , 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 necd to calculate the positive and negative Mer (moment to cause the beam to experience the first flexural cracking). 15" 30 275 - Straps R/C Beam -3-18's und 2 -46's Cross Section A-A