Situation 1 - Refer to the Figure shown. Prestressed hallow core slabs with typical section shown are a used for flooring of a library. Properties of the slab are as follows: A 14 x 105 mm²; St S = 6.8 x 106 mm³; a= 1.2 m; b = 200 mm. The slab is prestressed with 920 kN force at an eccentricity e = 63 mm below the neutral axis of the section. Slab weight is 2.7 kPa, superimposed DL = 2.0 kPa; 2.9 kPa. The slab is simply supported on a span of L = 8 m. Allowable stresses at service loads are 3.2 MPa in tension and 15.5 MPa in compression. Consider 20% loss of prestress at service loads. LL 31. Compute the maximum compressive stress (MPa) in the slab due to initial prestress force. A. 2.54 B. 12.6 C. 1.95 D. 15.1 32. Determine the maximum stress (MPa) at the bottom of the slab due to service loads and prestress force. B. 9.17 C C. 1.35 C D. 9.17 T A. 1.35 T 33. Determine the maximum additional load (kPa) including its own weight, that the slab can be subjected to if the allowable stresses at service loads are not to be exceeded. A. 3.86 B. 3.22 C. 4.12 D. 5.21