A simply supported beam has a height of 600 mm and a width of 300mm. Determine the maximum safe live load that the beam can carry. The dead load is the beam weight plus a superimposed load of 15 kN/m The stirrup size is 12 mm, the top bars are 2-20 mm and the bottom bars are 5-28 mm. The clear distance between layers of bottom bars is the bar size, 28 mm. Use fc'=30 MPa, Grade 60 (fy=414 MPa) reinforcements and concrete cover of 50 mm.