prestressed concrete beam of section 250 mm wide by 600 mm deep is used over an effective span 10 m to support an imposed load of 8 kN/m. If the unit weight of concrete is 25 kN/m³, find the agnitude of: (a) the concentric prestressing force necessary for zero stress at the bottom fibre at the midspan section when the beam is fully loaded. (b) the eccentric prestressing force of the tendon located at 200 mm from the soffit of the beam that would nullify the flexural stress due to the combined dead and imposed load. (c) Discuss the implication of the results in (a) and (b) above.

prestressed concrete beam of section 250 mm wide by 600 mm deep is used over an effective span 10 m to support an imposed load of 8 kN/m. If the unit weight of concrete is 25 kN/m³, find the agnitude of: (a) the concentric prestressing force necessary for zero stress at the bottom fibre at the midspan section when the beam is fully loaded. (b) the eccentric prestressing force of the tendon located at 200 mm from the soffit of the beam that would nullify the flexural stress due to the combined dead and imposed load. (c) Discuss the implication of the results in (a) and (b) above.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Pressure and Stress

Question

A prestressed concrete beam of section 250 mm wide by 600 mm deep is used over an effective span
of 10 m to support an imposed load of 8 kN/m. If the unit weight of concrete is 25 kN/m³, find the
magnitude of:
(a) the concentric prestressing force necessary for zero stress at the bottom fibre at the midspan
section when the beam is fully loaded.
(b) the eccentric prestressing force of the tendon located at 200 mm from the soffit of the beam
that would nullify the flexural stress due to the combined dead and imposed load.
(c) Discuss the implication of the results in (a) and (b) above.

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