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EXAMPLE 8.6 A prestressed I-section has the following properties: Area = 55 x 10³ mm² Second moment of area = 189 × 107 mm* Statical moment about the centroid = 468 x 10 mm³ Thickness of web = 50 mm It is prestressed horizontally by 24 wires of 5 mm diameter and vertically by similar wires at 150 mm centres. All the wires carry a tensile stress of 900 N/mm². Calculate the principal stresses at the centroid when a shearing force of 80 kN acts upon this section.

EXAMPLE 8.6 A prestressed I-section has the following properties: Area = 55 x 10³ mm² Second moment of area = 189 × 107 mm* Statical moment about the centroid = 468 x 10 mm³ Thickness of web = 50 mm It is prestressed horizontally by 24 wires of 5 mm diameter and vertically by similar wires at 150 mm centres. All the wires carry a tensile stress of 900 N/mm². Calculate the principal stresses at the centroid when a shearing force of 80 kN acts upon this 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 8.6 A prestressed I-section has the following properties: Area = 55 x 10³ mm² Second moment of area = 189 × 107 mm* Statical moment about the centroid = 468 x 10 mm³ Thickness of web = 50 mm It is prestressed horizontally by 24 wires of 5 mm diameter and vertically by similar wires at 150 mm centres. All the wires carry a tensile stress of 900 N/mm². Calculate the principal stresses at the centroid when a shearing force of 80 kN acts upon this section.
Transcribed Image Text:EXAMPLE 8.6 A prestressed I-section has the following properties: Area = 55 x 10³ mm² Second moment of area = 189 × 107 mm* Statical moment about the centroid = 468 x 10 mm³ Thickness of web = 50 mm It is prestressed horizontally by 24 wires of 5 mm diameter and vertically by similar wires at 150 mm centres. All the wires carry a tensile stress of 900 N/mm². Calculate the principal stresses at the centroid when a shearing force of 80 kN acts upon this section.
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