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

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

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

forces of tension and compression change but lever arm remains unchanged
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
both forces of tension and compres-sion as well as lever arm change

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