A rectangular concrete beam with width b = 11 in. and total depth h = 28 in. is post-tensioned using a single parabolic tendon with an eccentricity of 7.8 in. at midspan and 0 in. at the simple supports. The initial prestress force P; 334 kips, and the effectiveness ratio R = 0.84. The member is to carry super- imposed dead and live loads of 300 and 1000 lb/ft, respectively, uniformly dis- tributed over the 40 ft span. Specified concrete strength f. the time of transfer f in the concrete at midspan (a) for initial conditions before application of super- imposed load and (b) at full service load. Compare with the ACI limit stresses for Class U members. = 5000 psi, and at 4000 psi. Determine the flexural stress distributions
A rectangular concrete beam with width b = 11 in. and total depth h = 28 in. is post-tensioned using a single parabolic tendon with an eccentricity of 7.8 in. at midspan and 0 in. at the simple supports. The initial prestress force P; 334 kips, and the effectiveness ratio R = 0.84. The member is to carry super- imposed dead and live loads of 300 and 1000 lb/ft, respectively, uniformly dis- tributed over the 40 ft span. Specified concrete strength f. the time of transfer f in the concrete at midspan (a) for initial conditions before application of super- imposed load and (b) at full service load. Compare with the ACI limit stresses for Class U members. = 5000 psi, and at 4000 psi. Determine the flexural stress distributions
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A rectangular concrete beam with width b = 11 in. and total depth h = 28 in.
is post-tensioned using a single parabolic tendon with an eccentricity of 7.8 in.
at midspan and 0 in. at the simple supports. The initial prestress force P;
334 kips, and the effectiveness ratio R = 0.84. The member is to carry super-
imposed dead and live loads of 300 and 1000 lb/ft, respectively, uniformly dis-
tributed over the 40 ft span. Specified concrete strength f.
the time of transfer f
in the concrete at midspan (a) for initial conditions before application of super-
imposed load and (b) at full service load. Compare with the ACI limit stresses
for Class U members.
= 5000 psi, and at
4000 psi. Determine the flexural stress distributions
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