9.2. Starting with the column in Problem 9.1, perform enough additional calcula- tions to determine the effects of increasing f, from 5000 to 8000 psi on column capacity at both high and low axial loads. Assuming that a compressive strength of 8000 psi is appropriate for the lower stories of a high-rise structure, would you recommend using concrete with f. = 8000 psi for the columns supporting all stories within the building? Use your analysis to support your answer.

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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Answer Problem 9.2 convert english units to SI units (mm/m,MPa,KN)

A 16 in. square column is reinforced with four No. 14 (No. 43) bars, one in
each corner, with cover distances 3 in. to the steel center in each direction.
Material strengths are f = 5000 psi and f, = 60,000 psi. Construct the interac-
tion diagram relating axial strength P, and flexural strength M,. Bending will
be about an axis parallel to one face. Calculate the coordinates for P, P, and
at least three other representative points on the curve.
9.1.
9.2. Starting with the column in Problem 9.1, perform enough additional calcula-
tions to determine the effects of increasing f from 5000 to 8000 psi on column
capacity at both high and low axial loads. Assuming that a compressive strength
of 8000 psi is appropriate for the lower stories of a high-rise structure, would
you recommend using concrete with f = 8000 psi for the columns supporting
all stories within the building? Use your analysis to support your answer.
Transcribed Image Text:A 16 in. square column is reinforced with four No. 14 (No. 43) bars, one in each corner, with cover distances 3 in. to the steel center in each direction. Material strengths are f = 5000 psi and f, = 60,000 psi. Construct the interac- tion diagram relating axial strength P, and flexural strength M,. Bending will be about an axis parallel to one face. Calculate the coordinates for P, P, and at least three other representative points on the curve. 9.1. 9.2. Starting with the column in Problem 9.1, perform enough additional calcula- tions to determine the effects of increasing f from 5000 to 8000 psi on column capacity at both high and low axial loads. Assuming that a compressive strength of 8000 psi is appropriate for the lower stories of a high-rise structure, would you recommend using concrete with f = 8000 psi for the columns supporting all stories within the building? Use your analysis to support your answer.
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