Consider the column section below. It has eight #9 bars. The material properties are as follows: f =4,000 psi, f, = 60 ksi, and E¸ = 29,000 ksi . The cross-sectional area of a #9 bar is 1.0 in.². 8- #9 оооо 2.5" 4 Axis of bending 20" 00 0 20" 15" 2.5" 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 P that can be carried by the column. Determine the corresponding nominal moment capacity M. (you cannot use any design aid) (Ans: Pn = 246 kips, Mn = 460 kip-ft)
Consider the column section below. It has eight #9 bars. The material properties are as follows: f =4,000 psi, f, = 60 ksi, and E¸ = 29,000 ksi . The cross-sectional area of a #9 bar is 1.0 in.². 8- #9 оооо 2.5" 4 Axis of bending 20" 00 0 20" 15" 2.5" 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 P that can be carried by the column. Determine the corresponding nominal moment capacity M. (you cannot use any design aid) (Ans: Pn = 246 kips, Mn = 460 kip-ft)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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SOLVE USING STRESS STRAIN CALCULATION AND PROVIDE A TYPED SOLUTION.DO NOT COPY FROM PREVIOUS ANSWERS.STRESS STARAIN calculations are mandatory .
Transcribed Image Text:Consider the column section below. It has eight #9 bars. The material properties are as follows: f
=4,000 psi, f, = 60 ksi, and E¸ = 29,000 ksi . The cross-sectional area of a #9 bar is 1.0 in.².
8- #9
оооо
2.5" 4
Axis of
bending
20"
00 0
20"
15" 2.5"
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
P that can be carried by the column. Determine the corresponding nominal moment capacity
M. (you cannot use any design aid) (Ans: Pn = 246 kips, Mn = 460 kip-ft)
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