A concrete beam of symmetrical I-section spanning 8m has flange width and thickness of 200 and 60mm respectively. The overall depth of the beam is 400mm. The thickness of the web is 80mm. The beam is prestressed by a parabolic cable with an eccentricity of 150mm at the center and zero at the supports with an effective force of 100KN. The live load on the beam is 2kN/m. Determine the resulting stress at the bottom fiber considering prestress + self-weight + live load. O 0.70(tension) O 3.80(compression) 7.4(tension)

A concrete beam of symmetrical I-section spanning 8m has flange width and thickness of 200 and 60mm respectively. The overall depth of the beam is 400mm. The thickness of the web is 80mm. The beam is prestressed by a parabolic cable with an eccentricity of 150mm at the center and zero at the supports with an effective force of 100KN. The live load on the beam is 2kN/m. Determine the resulting stress at the bottom fiber considering prestress + self-weight + live load. O 0.70(tension) O 3.80(compression) 7.4(tension)

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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A concrete beam symmetrical I-section spanning 8m has flange width and thickness of 300mm and 60mm respectively. The overall depth is 400mm. The thickness of the of the web is 80mm. The beam is prestressed by a parabolic cable with eccentricity of 150mm at the center and zero at the supports with an effective force of 100kN. The live load on the beam is 2kN/m. Draw the stress distance diagram at central section for a) prestress + self weight (Unit weight of concrete =24kN/m^3) b) prestress + self weight + Live load) .
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