Type of column in construction
column: When vertical load carry and slab and beam dead load and live load transfer to footing that is called column .
Column may
be classified into the following two types, depending on whether slendeness
effects are considered insignificant or significant
1. Short column
2. Long column
The road of
effective column length to least lateral dimension is referred to as ‘slenderness
ratio’
- Columns with slenderness ratio between 3 to 12 are short column which invariably fail under ultimate loads with the material reaching its ultimate strength and not by buckling
- Column with slenderness ratio between 12 to 60 are long columns.
- Column having slenderness ratio less than 3 are called as pedestal.
Maximum
longitudinal reinforcement in an axially loaded column is 6% of gross cross
sectional area and minimum is 0.8% of gross cross sectional area.
Columns
with circular sections are mostly provided with transverse helical reinforcement,
although they may be provided with circular stirrups as a transverse reinforcement
but always helical reinforcement is preferred.
Spacing of
lateral cannot be more than
- 16 times the smallest diameter of
longitudinal reinforcement bar to be tied.
- The least lateral dimensio is 300mm.
Longitudinal
reinforcement bars should be in contact with transverse reinforcement so that
lateral confining of longitudinal bars occurs which will prevent buckling of
longitudinal bars and increases strength of column.
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