Example 01: Required Steel Area of Reinforced Concrete Beam

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.



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