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= Problem 6 An axially loaded rectangular tied column is to be designed for the following service loads: Dead Load, D = 1,500 KN Live Load, L = 835 kN Required Strength, U = 1.2 D + 1.6 1. Capacity Reduction Factor, Ø = 0.65 Effective Cover to Centroid of Steel Reinforcement = 70 mm Concrete, fc' = 27.5 MPa Steel, fy = 415 MPa = 1. Using 3% vertical steel ratio, what is the required column width (mm) if architectural considerations limit the width of the column in one direction to 350 mm? 2. If column Section = 450 mm x 450 mm. Vertical Reinforcement consists of 16 bars. Determine the diameter of vertical bars (mm) if the required minimum steel ratio is 3%? 3. If the column has a circular section, determine the required minimum diameter if it is reinforced with 8-25 mm Ø bars.