Differentiate between Braced and Unbraced Columns

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A structural system consists of different members such as footing, braced and unbraced column, beam, slab etc.

Braced and unbraced columns are basically vertical members which go throughout the height of the structural system i.e. from foundation to terrace.

Also Read:

Things to Check before Concreting Column
What is a Column?

The column can be categorized on different basis depending on its cross-section, length, behaviour, cross bracing, longitudinal reinforcement etc.

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The difference between Braced Column and Unbraced Columns are as follows:

Braced Column

Unbraced Column

  • Braced column may be considered braced in a given plan if lateral stability of the structure as a whole is provided by walls or bracing.
  • Unbraced column may be considered unbraced in a given plan if lateral stability of the structure as a whole is provided by columns only.
  • Braced columns are not designed to resist lateral loads.
  • Unbraced columns are designed to resist lateral loads.
  • In braced frames lateral loads like wind, earthquake, etc are resisted by some special arrangement like shear wall, bracings or special supports.
  • In unbraced frames lateral loads like wind, earthquake, etc are resisted by columns.
  • Sideways or joint translation is not possible in such columns.
  • Sideway or joint translation occurs in such columns.
  • Braced columns have zero value of sway.
  • Unbraced columns are subjected to sway.
  • Braced columns are more resistant to Earthquake than unbraced column.
  • Unbraced columns are less resistant to Earthquake than braced column.
  • It is difficult to provide opening between two braced columns.
  • It is easy to provide opening between two unbraced columns.
  • Used in tube structures where multistory buildings are to be constructed.
  • Used in RCC framed structures where low story buildings are to be constructed.
  • Structural System having bracing are mostly used in important/special structures.
  • Structural System without bracing are mostly used in general structures.
Also Read: 
Difference Between Beam and Column
Difference Between R.C.C. Frame & Load Bearing Structure

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