Structural Columns in Buildings
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Questions and Answers

What happens when columns are subjected to a high axial load without any cracking?

  • Concrete sections are subjected to eccentric compression.
  • Normal force is outside the cross section.
  • Vertical cracks appear with concrete cover failure. (correct)
  • Far side of the section is subjected to compression.

    • Why are columns designed with a higher safety factor compared to beams?

  • To avoid sudden collapse. (correct)
  • To ensure the far side of the section is subjected to tension.
  • To prevent brittle failure mode.
  • To reduce eccentricity of the load.

    • What happens when Mu is relatively small compared to Pu in an eccentrically loaded column?

  • The section will be subjected to a big eccentricity.
  • The section will be subjected to a small eccentricity. (correct)
  • Bending behavior will dominate.
  • The near side of the section will be subjected to tension.

    • What does the interaction diagram of a reinforced concrete cross section represent?

    <p>Combinations of axial loads and bending moments that cause failure.</p> Signup and view all the answers

    In a biaxially loaded column, what happens if Mu is large?

    <p>Normal force will be outside the cross section.</p> Signup and view all the answers

    Why are interaction diagrams useful in studying column strengths?

    <p>To visualize possible load combinations leading to failure.</p> Signup and view all the answers

    What is the purpose of adding lateral reinforcement or ties to reinforced concrete columns?

    <p>Decrease the tendency of bars to buckle out</p> Signup and view all the answers

    How are reinforced concrete columns classified based on lateral confinement?

    <p>Tied or spiral</p> Signup and view all the answers

    What is the key reason for providing a minimum longitudinal reinforcement ratio in reinforced concrete columns?

    <p>To account for stresses resulting from eccentricity</p> Signup and view all the answers

    Why do tied columns usually fail with spalling of the concrete cover followed by bar buckling?

    <p>Lack of lateral support provided by the cover</p> Signup and view all the answers

    What is a distinguishing feature between short and long reinforced concrete columns?

    <p>The length-to-width ratio and end restraint conditions</p> Signup and view all the answers

    How would you characterize the failure of axially loaded reinforced concrete columns?

    <p>Brittle with little or no warning</p> Signup and view all the answers

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