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Concrete columns

Columns are the main vertical load-bearing elements of many buildings. They are designed primarily to carry an axial load, usually in conjunction with a limited amount of bending. They may be cast in situ or be precast. In most cases the cross-sections are square or rectangular (to maintain the same geometry as the beams) although circular and other cross-sectional shapes are used.

 
Acknowledgement: The Concrete Society
 

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Axial shortening of concrete columns in high-rise buildings