CONSTRUCTION TECHNOLOGY BASIC COMPONENTS OF A BUILDING - COLUMN
01 Reinforced Concrete Column [RCC] 02 Height-Width Ratio Based Column 03 Shape Based Column 04RCC Construction Stages
A vertical structural member designed to support loads and transfer them to the foundation. Columns provide stability in distributing the weight of the building to the ground. It distribute the weight of the structure's upper floors and roof down to the foundation, ensuring stability and loadbearing capacity. Reinforced Concrete Column [RCC]
The strength of short columns is controlled by the strength of the material and the geometry of the cross section. Reinforcing rebar is placed axially in the column to provide additional axial stiffness. Short Columns Height-Width Ratio Based Column Long columns are those which have a height and cross sectional dimension ratio more than 1:12. These columns are usually weaker than short columns of same cross sectional area and are not generally preferred. Long Columns
Spiral columns are cylindrical columns with a continuous helical barwrapping around the column. The spiral acts to provide support in the transverse direction and prevent the column from barrelling. a) Spiral Columns Shape Based Column The amount of reinforcement is required to provide additional loadcarrying capacity greater than or equal to that attributed from the shell as to compensate for the strength lost when the shell spalls off.
With further thickening of the spiral rebar, the axially loaded concrete becomes the weakest link in the system and the strength contribution from the additional rebar does not take effect until the column has failed axially. a) Spiral Columns Shape Based Column At that point, the additional strength from spiral comes into play and prevents catastrophic failure, instead giving rise to a much slower ductile failure.
Tied columns have closed lateral ties spaced approximately uniformly across the column. The spacing of the ties is limited in that they must be close enough to prevent barrelling failure between them, and far enough apart that they do not interfere with the setting of the concrete. The ACI codebook puts an upward limit on the spacing between ties. b) Tied Columns Shape Based Column If the ties are spaced too far apart, the column will experience shear failure and barrel in between the ties.
RCC Construction Stages 01 Column layout work 02 Column reinforcement work 03 Column formwork 04 Pouring concrete into column