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Design and Construction
The spiral column is to be designed to carry a safe load of 2900 kN.
Concrete compressive strength, fc' = 28 MPa
Steel yield strength
Main reinforcement, fy
L
= 415 MPa
Clear Concrete Cover = 40 mm
Spiral Reinforcement, fy
v
= 275 MPa
Capacity reduction factor, ϕ = 0.75
Using a steel ratio ρ
g
= 0.025 relative to the gross concrete area, what should be the minimum column diameter (mm)?
450
400
410
475
Answer:
450
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