The column section shown below has ties, concrete compressive strength fe' = 5000 psi, and flexural reinforcement strength fy = 60,000 psi. Assume the cover thickness measured to the center of flexural reinforcement is 2.5 in. on all sides. Consider eccentricity in the x axis, i.e., bending is about the y axis. 20" 8 No.9 bars No. 3 ties 2.5", TYPICAL
The column section shown below has ties, concrete compressive strength fe' = 5000 psi, and flexural reinforcement strength fy = 60,000 psi. Assume the cover thickness measured to the center of flexural reinforcement is 2.5 in. on all sides. Consider eccentricity in the x axis, i.e., bending is about the y axis. 20" 8 No.9 bars No. 3 ties 2.5", TYPICAL
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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
Transcribed Image Text:2.
The column section shown below has ties, concrete compressive strength fe' =
5000 psi, and flexural reinforcement strength fy = 60,000 psi. Assume the cover thickness
measured to the center of flexural reinforcement is 2.5 in. on all sides. Consider
eccentricity in the x axis, i.e., bending is about the y axis.
20"
8 No. 9 bars
No. 3 ties
X
2.5", TYPICAL
(a) Calculate the maximum design compressive strength Pn,max.
(b) Calculate the design strength oP, and OM, when the distance of the neutral axis to the
extreme compression side equal to 9 inches.
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Step 1: Introduce the problem statement
VIEWStep 2: Compute maximum design axial strength of column
VIEWStep 3: Stress strain relation for case-II
VIEWStep 4: Strain at various level of reinforcement
VIEWStep 5: Compute force component
VIEWStep 6: Compute moment component
VIEWStep 7: Determine design strength for case-II
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