Centre of Mass and Centre of Rigidity in Structural Analysis
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Questions and Answers

What is the purpose of calculating the center of rigidity for a given floor diaphragm?

  • To analyze the building's resistance to torsional forces (correct)
  • To check for irregularity in the building's design
  • To determine the building's overall stiffness
  • To find the location of the building's center of mass

    • What is the formula used to calculate the center of rigidity (X,Y) from the three load cases?

  • X = Rzx / Rzy and Y = Rzz / Rzx
  • X = -Rzy / Rzz and Y = Rzx / Rzz (correct)
  • X = Rzy / Rzz and Y = -Rzx / Rzz
  • X = Rzz / Rzy and Y = Rzx / Rzz

    • What is the purpose of calculating the eccentricity between the center of mass and center of rigidity?

  • To analyze the building's resistance to torsional forces
  • To check for irregularity in the building's design (correct)
  • To find the location of the building's center of mass
  • To determine the building's overall stiffness

    • What is the maximum acceptable percentage of eccentricity between the center of mass and center of rigidity for a building to be considered safe against turning?

    <p>10%</p> Signup and view all the answers

    Where in ETABS can the values for the center of mass and center of rigidity be found?

    <p>Model Explorer &gt; Tables &gt; Analysis results &gt; Structure output &gt; Other output items</p> Signup and view all the answers

    What is the purpose of the diaphragm assignment in the ETABS model?

    <p>To calculate the center of rigidity</p> Signup and view all the answers

    What is the significance of the center of rigidity in the analysis of a building's structural performance?

    <p>It is used to check for irregularity in the building's design</p> Signup and view all the answers

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