Computer · Prestressed Concrete

A prestressed rectangular concrete beam of size 150 mm × 450 mm is prestressed by wires of area 150 mm2 at an eccentricity of 50 mm. The initial prestress in the wires is 1300 N/mm2. What is the loss of stress in steel due to the creep of concrete? (Take Es = 210 kN/mm2, Ec = 35 kN/mm2, and the ultimate creep strain is 41 × 10-6 mm/mm per N/mm2 of stress)