A highway bridge deck slab spanning 10 m is to be designed as a one way prestressed concrete slab…

A highway bridge deck slab spanning 10 m is to be designed as a one way prestressed concrete slab with parallel post-tensioned cables carrying an effective force of 620 kN. The deck slab is required to support a uniformly distributed live load of 25 kN/. The permissible stresses in concrete should not exceed 15 N/ in compression and no tension is permitted at any stage. Design the spacing of the cables and their position at mid-span section. Assume loss of prestress as 20 percent.