A prestressed concrete beam 400 mm x 800 mm is to carry a uniform load of 40 kN/m on a simple span of 11 m. the beam is prestressed to 2200 kN applied 200 mm below the neutral axis. a) Which of the following most nearly gives the stress at the bottom of the beam at midspan. b) Which of the following most nearly gives the stress at the top of the beam at midspan. c) If a concentrated load P is to be applied at midspan, which of the following most nearly gives the the value of P so that the stress at the bottom of the beam at midspan becomes zero.
A prestressed concrete beam 400 mm x 800 mm is to carry a uniform load of 40 kN/m on a simple span of 11 m. the beam is prestressed to 2200 kN applied 200 mm below the neutral axis. a) Which of the following most nearly gives the stress at the bottom of the beam at midspan. b) Which of the following most nearly gives the stress at the top of the beam at midspan. c) If a concentrated load P is to be applied at midspan, which of the following most nearly gives the the value of P so that the stress at the bottom of the beam at midspan becomes zero.
Steel Design (Activate Learning with these NEW titles from Engineering!)
6th Edition
ISBN:9781337094740
Author:Segui, William T.
Publisher:Segui, William T.
Chapter9: Composite Construction
Section: Chapter Questions
Problem 9.1.3P
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A prestressed concrete beam 400 mm x 800 mm is to carry a
uniform load of 40 kN/m on a simple span of 11 m. the beam is prestressed to
2200 kN applied 200 mm below the neutral axis.
a) Which of the following most nearly gives the stress at the bottom of the
beam at midspan.
b) Which of the following most nearly gives the stress at the top of the beam
at midspan.
c) If a concentrated load P is to be applied at midspan, which of the following
most nearly gives the the value of P so that the stress at the bottom of the
beam at midspan becomes zero.
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