 Why are Circular Column Design for bridges construction?

# Why are Circular Column Design for bridges construction? Source: http://bit.ly/2otkUdq

In this article you will learn Why are Circular Column Design for bridges construction? and not use Square columns.

#### What is the main difference between square column and circular column?

Here are some thoughts:
• Circular columns are symmetric about any centroidal axis. Square columns have only 4 axes of symmetry.
• If you compare a square column with a circular column having the same diameter as the side of the square column, circular column has a smaller cross section area (0.785 times the square column) but larger second moment of area (1.178 times the square column).
• Thus is less prone to buckling and may require slightly more reinforcement to carry the same load as a square column.
• Minimum number of bars required in a square column is 4 while for circular columns, it is 6. Form work for square columns is simpler (due to the straight sides) compared to circular columns.
• Circular columns are considered aesthetically pleasing compared to square columns (but that is subjective).
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