Concrete Technology and Design of Concrete Structures
According to IS: 456-1978, the column or the strut is the member whose effective length is greater than

4 times the least lateral dimension
3 times the least lateral dimension
The least lateral dimension
2 times the least lateral dimension

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

both forces of tension and compres-sion as well as lever arm change
forces of tension and compressions remain unchanged but lever arm changes with the moment
both forces of tension and compres-sion as well as lever arm remain unchanged
forces of tension and compression change but lever arm remains unchanged

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