(Solved): A post-tensioned prestressed concrete beam with a rectangular cross section is simply supported ov ...

A post-tensioned prestressed concrete beam with a rectangular cross section is simply supported over 10 m as shown in Figure 1. The beam carries a service concentrated load of 50 kN at the mid span. Given: Self-weight of beam (assume), Wi Depth of beam Total short term loss Total short term and long term loss Allowable compressive stress at transfer Allowable compressive stress at service Allowable tensile stress at transfer Allowable tensile stress at service 6 kN/m 500 mm 10% 20% 25 N/mm2 18 N/mm2 -1.5 N/mm2 -0.5 N/mm2 Determine minimum width (b) of the beam. P= 50 kN Wi TMT TTTTTTT 10 m b 500 mm Cross Section