A pretensioned, prestressed concrete beam of rectangular section 150 mm wide and 350 mm deep, has an effective cover of 50 mm. If f = 40 N/mm², fpu=1600 N/mm², (fpy//pu)=0.90, determine, using ACI 318-1989 recommendations: (a) the minimum area of prestressing steel to avoid failure of section by fracture of steel; (b) the maximum area of prestressing steel which just ensures failure by yielding of steel; (c) ultimate flexural strength corresponding to case (b); and (d) the ultimate flexural strength of the section if the area of prestressing steel in case (b) is doubled in the section.
A pretensioned, prestressed concrete beam of rectangular section 150 mm wide and 350 mm deep, has an effective cover of 50 mm. If f = 40 N/mm², fpu=1600 N/mm², (fpy//pu)=0.90, determine, using ACI 318-1989 recommendations: (a) the minimum area of prestressing steel to avoid failure of section by fracture of steel; (b) the maximum area of prestressing steel which just ensures failure by yielding of steel; (c) ultimate flexural strength corresponding to case (b); and (d) the ultimate flexural strength of the section if the area of prestressing steel in case (b) is doubled in the section.
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
Problem 1LR
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Transcribed Image Text:A pretensioned, prestressed concrete beam of rectangular section
150 mm wide and 350 mm deep, has an effective cover of 50 mm. If f = 40 N/mm²,
fpu=1600 N/mm², (py/pu)=0.90, determine, using ACI 318-1989 recommendations:
(a) the minimum area of prestressing steel to avoid failure of section by fracture of
steel;
(b) the maximum area of prestressing steel which just ensures failure by yielding of
steel;
(c) ultimate flexural strength corresponding to case (b); and
(d) the ultimate flexural strength of the section if the area of prestressing steel in
case (b) is doubled in the section.
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