A 16 × 20 in. column is made of the same concrete and reinforced with the same six No. 9 (No. 29) bars as the column in Examples 1.1 and 1.2, except that a steel with yield strength f, = 40 ksi is used. The stress-strain diagram of this reinforcing steel is shown in Fig. 2.15 for f, = 40 ksi. For this column determine (a) the axial load that will stress the concrete to 1200 psi; (b) the load at which the steel starts yielding; (c) the maximum load; and (d) the share of the total load carried by the reinforcement at these three stages of loading. Compare results with those calculated in the examples for f, = 60 ksi, keeping in mind, in regard to relative economy, that the price per pound for reinforcing steels with 40 and 60 ksi yield points is about the same.
A 16 × 20 in. column is made of the same concrete and reinforced with the same six No. 9 (No. 29) bars as the column in Examples 1.1 and 1.2, except that a steel with yield strength f, = 40 ksi is used. The stress-strain diagram of this reinforcing steel is shown in Fig. 2.15 for f, = 40 ksi. For this column determine (a) the axial load that will stress the concrete to 1200 psi; (b) the load at which the steel starts yielding; (c) the maximum load; and (d) the share of the total load carried by the reinforcement at these three stages of loading. Compare results with those calculated in the examples for f, = 60 ksi, keeping in mind, in regard to relative economy, that the price per pound for reinforcing steels with 40 and 60 ksi yield points is about the same.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A 16 × 20 in. column is made of the same concrete and reinforced with the
same six No. 9 (No. 29) bars as the column in Examples 1.1 and 1.2, except
that a steel with yield strength f, = 40 ksi is used. The stress-strain diagram of
this reinforcing steel is shown in Fig. 2.15 for f, = 40 ksi. For this column
determine (a) the axial load that will stress the concrete to 1200 psi; (b) the
load at which the steel starts yielding; (c) the maximum load; and (d) the share
of the total load carried by the reinforcement at these three stages of loading.
Compare results with those calculated in the examples for f, = 60 ksi, keeping
in mind, in regard to relative economy, that the price per pound for reinforcing
steels with 40 and 60 ksi yield points is about the same.
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