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

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Design criteria for structural loading

The different loads such as loads due to self-weight (dead load) and external loads such as live load, wind loads, seismic load, snow load, and other loads and load combinations that influence the design of a building are called structural loading. The nature of the applied load differs from changes in the location, design, and type of materials used. The design criteria require that structures must be designed and constructed to be able to withstand all load types that are expected to act upon the structure and render its usage for the designated purpose. The structural members such as beams, slabs, columns, and foundations help the structure to withstand the applied load. There are different institutes such as ASCE and ACI that provide building design codes to assure minimum safety requirements and quality of the structures.

Question

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

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Step 2: Compute maximum design axial strength of column

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Step 3: Stress strain relation for case-II

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Step 4: Strain at various level of reinforcement

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Step 5: Compute force component

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Step 6: Compute moment component

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Step 7: Determine design strength for case-II

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