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EXAMPLE 8.4 A concrete beam having a rectangular section, 150 mm wide and 300 mm deep, is prestressed by a parabolic cable having an eccentricity of 100 mm at the centre of span, reducing to zero at the supports. The span of the beam is 8 m. The beam supports a live load of 2 kN/m. Determine the effective force in the cable to balance the dead and live loads on the beam. Estimate the principal stresses at the support section.

EXAMPLE 8.4 A concrete beam having a rectangular section, 150 mm wide and 300 mm deep, is prestressed by a parabolic cable having an eccentricity of 100 mm at the centre of span, reducing to zero at the supports. The span of the beam is 8 m. The beam supports a live load of 2 kN/m. Determine the effective force in the cable to balance the dead and live loads on the beam. Estimate the principal stresses at the support section.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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EXAMPLE 8.4 A concrete beam having a rectangular section, 150 mm wide and 300 mm deep, is prestressed by a parabolic cable having an eccentricity of 100 mm at the centre of span, reducing to zero at the supports. The span of the beam is 8 m. The beam supports a live load of 2 kN/m. Determine the effective force in the cable to balance the dead and live loads on the beam. Estimate the principal stresses at the support section.
Transcribed Image Text:EXAMPLE 8.4 A concrete beam having a rectangular section, 150 mm wide and 300 mm deep, is prestressed by a parabolic cable having an eccentricity of 100 mm at the centre of span, reducing to zero at the supports. The span of the beam is 8 m. The beam supports a live load of 2 kN/m. Determine the effective force in the cable to balance the dead and live loads on the beam. Estimate the principal stresses at the support section.
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