Extracted text: 0.67f (CO 0.002 0.0035 Strain Assume straight line instead of parabola for stress strain curve of concrete as follows and partial factor of safety as 1.0. A rectangular under-reinforced concrete section of 300 mm width and 500 mm effective depth is reinforced with 3 bars of grade Fe-415, each of 16 mm diameter. Concrete mix is M-20. The depth of the neutral axis from the compressive fibre is Stress