*When do we use tied columns? What about spiral columns?
*How does the behavior of column affected by using each type of
confinement? (Tied vs Spiral)
*What is the behavior of each type when axially and eccentrically
loaded (Tied vs Spiral)
*How does the eccentricity ratio (e/h) affect the selection of the
type of columns (Tied vs Spiral)
*What are the other differences of Tied vs Spiral columns
Tied columns are used to place the reinforcement tightly in the thin concrete cover, if when there is a high stress the reinforcement cannot burst out from the concrete, it is equally spaced lateral ties across the columns.
Spiral columns are used in cylindrical column with continous helical bars to provide support the column in the transverse direction.
✓ Column with spiral can withstand more loads than the column with lateral ties because spiral column can provide more ductility and toughness in the transverse direction.
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