A PSC beam of size 200 mm × 350 mm is pre-stressed by 5 high tensile steel wires of 6 mm diameter. The wires are stressed to 1350 N/mm2 and located at an eccentricity of 75 mm.
Assume modular ratio (m) = 6, M.O.I of nominal Section = 714.583 × 106 mm4 and M.O.I of Equivalent Section = 718.52 × 106 mm4 (M.O.I - Moment of inertia MOI)
1
Stress developed at soffit of beam by considering nominal beam is 6.17 N/mm2
2
Stress developed at soffit of beam by considering Equivalent concrete is 6.17 N/mm2
3
Stress developed at soffit of beam by considering Equivalent concrete is 6.24 N/mm2
4
Stress developed at soffit of beam by considering nominal beam is 6.24 N/mm2