Concrete Technology and Design of Concrete Structures
The average permissible stress in bond for plain bars in tension is

decreased by 10% for bars in compression
decreased by 25% for bars in compression
increased by 10% for bars in compression
increased by 25% for bars in compression

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Concrete Technology and Design of Concrete Structures
Due to circumferential action of the spiral in a spirally reinforced column

Capacity of column is decreased but ductility of column increases
Ductility of column reduces
Capacity of column is decreased
Both the capacity of column and ductility of column increase

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