Civil Engineering Exams (Civil Design) – Flashcard Mode

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)?