In the design of beams for the limit state collapse in flexure as per IS 456:2000, let the maximum strain in concrete be limited to 0.0025 instead of 0.0035. For this situation, Consider a under-reinforced beam with a width as 250 mm, effective depth as 350 mm, Area of steel as 1500 mm2, characteristics strength of concrete and steel as 30 MPa and 250 MPa.
Which of the following is/are correct?
1
Force acting on the compression zone is 326 N
2
Actual depth of neutral axis is 131.8 mm
3
Actual depth of neutral axis is 156 mm
4
Force acting on the compression zone is 326 kN