Spiral Reinforcing

Definition

Spiral reinforcing is continuously-wound reinforcing in the form of a cylindrical helix.

Purpose

The purpose of spiral reinforcing is to provide additional strength and stability to cylindrical concrete structures, such as columns and piers, by evenly distributing the load and resisting tensile stresses.

Examples of Use

• Spiral reinforcing is used in concrete columns to enhance their load-bearing capacity and resistance to buckling.
• Piles and caissons for deep foundations incorporate spiral reinforcing to improve their structural integrity.
• Industrial chimneys and silos use spiral reinforcing to withstand the forces exerted by stored materials and environmental conditions.

Related Terms

• Rebar: Steel bars used to reinforce concrete.
• Helix: A spiral-shaped form that is used in spiral reinforcing.
• Concrete Column: A vertical structural element that transfers loads from above to a foundation.

Notes

Spiral reinforcing is especially useful in seismic regions, where it provides additional ductility and energy absorption capacity to concrete structures, improving their earthquake resistance.