Example (1): For a simply supported symmetrically I-section beam with the properties as follow: I=5x109 mm4, A=114000mm2 , r2=44000mm2 , h= 610mm , carries uniformly distributed load (D+L) = 8 kN/m in additional to its own weight over on span length of 12m, e=130mm , Pi=750kN, Pe=640kN. For ex. (1) calculate stresses at (/) span and check them with ACI limitations. If the tendon profile in ex.(1) is as shown below, calculate stresses at midspan, at ends and at (1/4) span. Then check the stresses with ACI limitations. tendon centroid 50mm 150mm 12m For ex. (1), find Pi (Initial prestress force) such that the bottom fiber stress is finally zero, (15% losses) and check other stresses with ACI limitations.
Example (1): For a simply supported symmetrically I-section beam with the properties as follow: I=5x109 mm4, A=114000mm2 , r2=44000mm2 , h= 610mm , carries uniformly distributed load (D+L) = 8 kN/m in additional to its own weight over on span length of 12m, e=130mm , Pi=750kN, Pe=640kN. For ex. (1) calculate stresses at (/) span and check them with ACI limitations. If the tendon profile in ex.(1) is as shown below, calculate stresses at midspan, at ends and at (1/4) span. Then check the stresses with ACI limitations. tendon centroid 50mm 150mm 12m For ex. (1), find Pi (Initial prestress force) such that the bottom fiber stress is finally zero, (15% losses) and check other stresses with ACI limitations.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Example (1): For a simply supported symmetrically I-section beam with the
properties as follow:
I=5x109 mm4 , A=114000mm2 , r2=44000mm2 , h= 610mm , carries uniformly
distributed load (D+L) = 8 kN/m in additional to its own weight over on span length
of 12m, e=130mm , Pi=750KN , Pe=640kN.
. For ex. (1) calculate stresses at (/) span and check them with ACI
limitations.
: If the tendon profile in ex.(1) is as shown below, calculate stresses at
midspan, at ends and at (1/4) span. Then check the stresses with ACI limitations.
tendon
centroid
50mm
150mm
12m
For ex. (1), find Pi (Initial prestress force) such that the bottom fiber
stress is finally zero, (15% losses) and check other stresses with ACI limitations.
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