A 460 mm reinforced concrete interior spiral column carries service loads of 1025 kN dead load and 715 kN live load (Figure 3). The column rest on a square spread footing 2.75 m x 2.75 m in dimension. The net ultimate soil pressure at the base of the footing is 314 kPa, f’c =21 MPa, fy = 345 MPa, clear cover is 75 mm and 25 mm-diameter bars, the allowable soil pressure is 250 kPa? Unit weight of soil is 17kN/m3 ; unit weight of concrete is 23.5 kN/m3. The underside of footing is 1.50m below the natural grade line 2.75 mPD = 1025 KNPLPL = 715 KN2.75 m460 mm dia 15. What is the effective depth of the footing as required by beam shear in mm?16. What is the effective depth of the footing as required by punching shear in mm?17. What is the effective depth of the footing as required by flexure (bending) if a minimumreinforcement of 1.4/fy is used?18. What is the development length of the tension steel if the value of the factors: Yt = Ye=Ys=λ = 1.0?Hint: Convert first the circular column into an equivalent square column before getting the beamshear, punching shear and bending moment.

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Answered: A 460 mm reinforced concrete interior…

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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A 460 mm reinforced concrete interior spiral column carries service loads of 1025 kN dead load and 715 kN live load (Figure 3). The column rest on a square spread footing 2.75 m x 2.75 m in dimension. The net ultimate soil pressure at the base of the footing is 314 kPa, f’c =21 MPa, fy = 345 MPa, clear cover is 75 mm and 25 mm-diameter bars, the allowable soil pressure is 250 kPa? Unit weight of soil is 17kN/m3 ; unit weight of concrete is 23.5 kN/m3. The underside of footing is 1.50m below the natural grade line

2.75 m
PD = 1025 KN
PL
PL = 715 KN
2.75 m
460 mm dia

15. What is the effective depth of the footing as required by beam shear in mm?
16. What is the effective depth of the footing as required by punching shear in mm?
17. What is the effective depth of the footing as required by flexure (bending) if a minimum
reinforcement of 1.4/fy is used?
18. What is the development length of the tension steel if the value of the factors: Yt = Ye=
Ys=λ = 1.0?
Hint: Convert first the circular column into an equivalent square column before getting the beam
shear, punching shear and bending moment.

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