This document provides details on reinforcing concrete columns, including: - Classification of columns as tied, spirally reinforced, or composite - Minimum reinforcement requirements of 4 bars for tied columns and 6 bars for spiral columns - Design considerations for tie ratio between 1-8% or 1-6% depending on code - Clear cover and spacing requirements between bars - Arrangement and sizing of ties and spirals - Requirements for bundling, lapping, and hooking of reinforcement bars