Practice Modal Stiffness (5.12.2) - Degrees of Freedom and SDOF - Earthquake Engineering

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6 sample questions

Question 1.
What is modal stiffness?
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Think about how stiffness relates to vibration.
Question 2.
How is modal stiffness calculated?
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Consider the components of the formula.
3Question 3.
What does modal stiffness represent in structural dynamics?
- Stiffness of a structure
- Stiffness for a specific mode
- Mass of a structure
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Focus on how stiffness applies to vibration.
4Question 4.
True or False: Modal mass is not a factor in determining modal stiffness.
- True
- False
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Recall the formula k¿ = m¿ω².
Question 5.
A structure has a modal mass of 500 kg and its fundamental circular frequency is 4 rad/s. Calculate its modal stiffness and explain what this value implies for its seismic behavior.
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Use k¿ = m¿ω² for the calculation.
Question 6.
Discuss the role of modal stiffness in the design considerations for earthquake-resistant structures, providing examples of how it affects material selection and structural layout.
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Think of material properties and structural forms.

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