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Civil Engineering QUESTION #6627
Question 1
Which of the following describes the 'Balance Point' in a column interaction diagram?
  • Where the concrete reaches $\epsilon_u = 0.003$ and steel remains elastic
  • Where the concrete reaches $\epsilon_u = 0.003$ and tension steel simultaneously reaches yield strain $\epsilon_y$✔️
  • Where the axial load is zero and the section is in pure flexure
  • Where the eccentricity of the load is zero
Correct Answer Explanation
The balanced strain condition occurs when the tension reinforcement reaches its yield strain at the same time the concrete reaches its assumed ultimate strain of 0.003.