In reinforced concrete structure ties are used in columns. There are several reasons for using ties. The following are the main reasons behind using ties in the column.
- To hold the longitudinal bars in position in the forms while the concrete is being placed.
- To prevent the highly stressed slender longitudinal bars from buckling outward by bursting the thin concrete cover.
There are many civil engineering code provisions for using ties in columns. During designing a concrete column, the design engineer must be aware of these code provisions.