379) The design yield stress of steel according to IS: 456-1978 is [where fy is the characteristic yield strength of steel]

380) According to Whitney's theory, ultimate strain of concrete is assumed to be

381) According to Whitney's theory, depth of stress block for a balanced section of a concrete beam is limited to [where d is effective depth of beam[ES 2k]]

382) The load factors for live load and dead load are taken respectively as

383) As per Whitney's theory, the maximum moment of resistance of the balanced section of a beam of width b and effective depth d is given by [where acy is the cylinder compressive strength of concrete]