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.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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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.
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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