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

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

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

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