Concrete Technology and Design of Concrete Structures
If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

depends on aCbC only
depends on both crst and acbc
depends on as, only
is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.

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

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

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