Find the final percentage of loss of stress in steel wires. a pretensioned beam 250 mm wide and 360 mm deep is prestressed by 10 wires of 8mm dia. initial stress to 1000n/mm. the centroid of the steel wires is located at 105 mm from the soffit. determine the maximum stress in concrete immediately after transfer allowing elastic shortening of concrete only at the level of centroid of the steel. if, however, the concrete is subjected to additional shortening due to the creep and shrinkage and the steel is subjected to relaxation of stress of 5% of initial stress. take es=210kn/mm, ec=36.85 kn/mm. =1.60, take residual shrinkage strain =3x10⁻⁴.
