Consider the column section below. It has eight #9 bars. The material properties are as follow =4,000 psi, ƒ, = 60 ksi, and E. = 29,000 ksi . The cross-sectional area of a #9 bar is 1.0 in.². 8- #9 0000 15" Axis of bending 0 00 0 20" P M

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Chapter1: Introduction
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Problem 1.5.6P: The data in Table 1.5.3 were obtained from a tensile test of a metal specimen with a rectangular...
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Consider the column section below. It has eight #9 bars. The material properties are as follows: fr
=4,000 psi, f, = 60 ksi, and E. = 29,000 ksi . The cross-sectional area of a #9 bar is 1.0 in.2².
8- #9
0000
2.5" 44
Axis of
bending
20"
15" 2.5"
20"
P
M
If the tensile strain in the reinforcing bars cannot be lower than 0.007 when its nominal moment
capacity is reached, using the principles of mechanics to determine the maximum axial load
n
P, that can be carried by the column. Determine the corresponding nominal moment capacity
Mn. (you cannot use any design aid) (Ans: Pn = 246 kips, Mn = 460 kip-ft)
Transcribed Image Text:Consider the column section below. It has eight #9 bars. The material properties are as follows: fr =4,000 psi, f, = 60 ksi, and E. = 29,000 ksi . The cross-sectional area of a #9 bar is 1.0 in.2². 8- #9 0000 2.5" 44 Axis of bending 20" 15" 2.5" 20" P M If the tensile strain in the reinforcing bars cannot be lower than 0.007 when its nominal moment capacity is reached, using the principles of mechanics to determine the maximum axial load n P, that can be carried by the column. Determine the corresponding nominal moment capacity Mn. (you cannot use any design aid) (Ans: Pn = 246 kips, Mn = 460 kip-ft)
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