19.1 A 60-ft-span of a simply supported pretensioned beam has the section shown in Fig. 19.12. The beam is prestressed by a force F=395 K at transfer (after the elastic loss). The prestress force after all losses is F=320. (compressive stress after all losses) = 6 ksi and f = 4ksi. For the midspan section and using the ACI Code allowable stresses, (a) calculate the extreme fiber stresses due to the prestressing force plus dead load and (b) calculate the allowable uniform live load on the beam. 20"- 6.5" 5 24" Aps C.G.S. 12 Figure 19.12 Problem 19.1. 42" 12"
19.1 A 60-ft-span of a simply supported pretensioned beam has the section shown in Fig. 19.12. The beam is prestressed by a force F=395 K at transfer (after the elastic loss). The prestress force after all losses is F=320. (compressive stress after all losses) = 6 ksi and f = 4ksi. For the midspan section and using the ACI Code allowable stresses, (a) calculate the extreme fiber stresses due to the prestressing force plus dead load and (b) calculate the allowable uniform live load on the beam. 20"- 6.5" 5 24" Aps C.G.S. 12 Figure 19.12 Problem 19.1. 42" 12"
Chapter2: Loads On Structures
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19.1 A 60-ft-span of a simply supported pretensioned beam has the section shown in Fig. 19.12. The beam is
prestressed by a force F₁=395 K at transfer (after the elastic loss). The prestress force after all losses is
F = 320,f (compressive stress after all losses) = 6 ksi and f = 4ksi. For the midspan section and using the ACI
Code allowable stresses, (a) calculate the extreme fiber stresses due to the prestressing force plus dead load and (b)
calculate the allowable uniform live load on the beam.
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-20"-
6.5"
6"
T
6" 24"
Aps
C.G.S.
12"
Figure 19.12 Problem 19.1.
42"
12"
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