Concrete Technology and Design of Concrete Structures
Stress strain curve of high tensile steel

has a definite yield point
does not show definite yield point but yield point is defined by 0.2% proof stress
does not show definite yield point but yield point is defined by 0.1% proof stress
does not show definite yield point but yield point is defined by 2% proof stress,

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Concrete Technology and Design of Concrete Structures
In prestressed concrete

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

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