The Constructor

Types of RCC Columns and its Construction Methods

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There are various types of RCC Column based on its shape, length and forces. Function and construction methods are discussed here for these types of column. Column is a vertical member which takes complete load of the beam, slabs and the entire structure and the floor and other area of the building is adjusted as per the requirement of the client or owner. The size of the columns, quantity of cement sand and aggregate to be mixed, the number of steel bars to be placed, spacing between the stirrups is all mentioned in the structural drawing which is designed by structural designer as per the actual load on the column and considering the factor of safety. A column is a vertical member which effectively takes load by compression. Basically column is a compression member as load acts along its longitudinal axis. Bending moment may occur due to wind earthquake or accidental loads. Column transfers the load of the structure of slabs beams above to below, and finally load is transferred to the soil. Position of the columns should be so that there are no tensile stresses developed at the cross section of the columns. Columns location should be such that it hides in the walls partially or fully.

Types of RCC Column and its Functions and Construction Methods

Types of RCC Column

Types of RCC Column based on Shapes

Types of RCC Column based on length 

Where L is the height of the column, B is width Generally, floor height is approximately 3 m or 10 feet, L/B ratio will be less than 12, so in maximum cases short column is placed. In case where height of floor is more than 3 m or 10 feet, we need to check L/B ratio so result may be long or short column. Generally, on long column there are more forces generated so should be designed carefully.

Types of RCC Column based on moments

Generally, in a building corner most columns are biaxial columns and side column is uniaxial column and internal columns can be any of these.

Construction Methods of RCC Columns

Construction of RCC columns involve following four steps:

Layout of Columns

Column layouts are done by laying rope in the grid lines and mark the location of columns

Column Reinforcement

Column reinforcement works needs following checklist on site:

Column Reinforcement and Layout

Column Formwork

Columns carry the load of structure and hence they are critical. It is important to align them for verticality so that load is transmitted properly. The column shuttering should be strong enough to take the pressure of fresh concrete and remain in position during concreting.

Some Guidelines on column shuttering

Concreting of RCC Column

Concreting of an RCC column can be done

Manual Concreting of RCC Column

Concreting of RCC Column using Pump

Following points to be followed during and after concreting:

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