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What Are Stub Columns?

A stub column is defined as a type of column whose length is small and sufficient to prevent the column failure and long enough to contain the residual stress pattern that would exist in the column. It is not directly connected to the footing or a column. 

What Are Stub Columns?

It is a additional member constructed over the beam or slab that would  help increase the stiffness of the building and bring symmetrical load distribution. It is a redundant compression member.

As shown in the figure-1 above, stub columns are constructed over a slab and act as a point load over the slab. 

Need For Stub Columns

  1. Stub columns are introduced to bring symmetry in geometry and load distribution.
  2. It is used to increase the aesthetic view of the building
  3. It is introduced as an intermediate member between long span room i.e. when the beam span increases, deflection increases. This can be reduced by introducing stub column.
  4. Stub column are introduced to take unexpected extra load coming over the building during the construction process.
  5. It is used to increase the stiffness of the building.
  6. Stub column helps safe load transfer from one beam to other.
Stub columns mainly lie over a beam and not on footing. This can create extra shear in beam, which is non acceptable. So, we need to design the beam for an increased cross-section. This makes stub column an uneconomical option in certain circumstances.

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