Concrete Technology and Design of Concrete Structures
For a reinforced concrete section, the shape of shear stress diagram is

wholly rectangular
parabolic above neutral axis and rectangular below neutral axis
rectangular above neutral axis and parabolic below neutral axis
wholly parabolic

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

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

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