A prestressed concrete beam of size 225 mm x 325 mm is used for an effective span of 5.5 m. It supports a super-imposed load of 4.2 kN/m. At the mid-span section of the beam find. (a) the concentric prestressing force necessary to have zero fibre stress at the bottom of beam when the beam is fully loaded. (b) the eccentric prestressing force located at 115 mm from the beam bottom which will totally counteract the stresses due to external loading.
A prestressed concrete beam of size 225 mm x 325 mm is used for an effective span of 5.5 m. It supports a super-imposed load of 4.2 kN/m. At the mid-span section of the beam find. (a) the concentric prestressing force necessary to have zero fibre stress at the bottom of beam when the beam is fully loaded. (b) the eccentric prestressing force located at 115 mm from the beam bottom which will totally counteract the stresses due to external loading.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A prestressed concrete beam of size 225
mm x 325 mm is used for an effective
span of 5.5 m.
It supports a super-imposed load of 4.2
kN/m.
At the mid-span section of the beam find.
(a) the concentric prestressing force
necessary to have zero fibre stress at the
bottom of beam when the beam is fully
loaded.
(b) the eccentric prestressing force
located at 115 mm from the beam bottom
which will totally counteract the stresses
due to external loading.
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