Example 01: Required Steel Area of Reinforced Concrete Beam
Problem
A rectangular concrete beam is reinforced in tension only. The width is 300 mm and the effective depth is 600 mm. The beam carries a moment of 80 kN·m which causes a stress of 5 MPa in the extreme compression fiber of concrete. Use n = 9.
1. What is the distance of the neutral axis from the top of the beam?
2. Calculate the required area for steel reinforcement.
3. Find the stress developed in the steel.
