Why don’t we use circular beams in construction or in structures?

Why don’t we use circular beams in construction or in structures?

TECHNICAL DIFFICULTIES IN CIRCULAR BEAM

Technically speaking let us take the bending stress diagram its is clearly we know that top fiber has more stress and bottom fiber, but at middle fiber there is no stress. We have to choose section similar to bending stress diagram.

If we use circular section the top fiber has least area but beam top fiber has more stress and we need more area at top ,so we cannot adopt circular section & economically disadvantage.

PRACTICAL DIFFICULTIES IN CIRCULAR BEAM

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Difficulty in using circular beam

1. Formwork :

2. Casting :

3. Deshuttering :

1. Formwork :

• Formwork for the Circular cross-section is very difficult and we have to use material like steel rather then traditional wood

• Fixing it horizontally is more challenging since the base of the beam formwork shall be semicircular. 

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2. Casting :

• The concrete used for the circular cross-section has to be high slump concrete so that it moves to all crevices of the section.

• Finishing the top portion of the beam with highly skilled labour

3. Deshuttering :

• It shall not be possible to first remove the sides and then the beam bottom.

• The formwork shall have to be removed in two halves after the concrete attains the strength.

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