Confinement reinforcement for ductility (columns seismic: ACI 318)

Reinforcement Type

Confinement reinforcement in columns at regions where provided should consist of hoops, i.e. closed or continuously wound ties with a seismic hook at each end.

Note: Confinement reinforcement in the form of spiral reinforcement is beyond scope in the current release of Tekla Structural Designer.

Detailing Regions

Confinement reinforcement is required to be provided over three types of regions along reinforced concrete columns that are part of Intermediate Moment Frames and Special Moment Frames:

Support regions: These are probable flexural yielding regions at the top and bottom of the stack next to column-beam joints;
Non-reversing plastic hinge regions: These are probable flexural yielding regions outside support regions.
Note: Non-reversing plastic hinge regions are not identified in the current release of Tekla Structural Designer.
Lap splices: Confinement reinforcement in the form of hoops is required to be provided over the length of lap splices in reinforced concrete columns part of Special Moment Frames

Note: The requirement for hoop spacing not to exceed the maximum allowed hoop spacing at lap splices is beyond scope in the current release of Tekla Structural Designer.