Practice Modal Mass and Modal Contribution - 18.6 | 18. Concept of Mode Superposition | Earthquake Engineering - Vol 2
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18.6 - Modal Mass and Modal Contribution

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What does modal mass represent?

💡 Hint: Think about which mass is involved in the structure's response.

Question 2

Easy

Define modal contribution.

💡 Hint: Consider how modes influence seismic events.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What does modal mass signify in structural dynamics?

  • Total mass of the structure
  • Mass participating in a specific mode
  • Unrelated to seismic analysis

💡 Hint: Connect it back to modes of vibration.

Question 2

True or False: The modal contribution is irrelevant for low-rise structures.

  • True
  • False

💡 Hint: Reflect on the importance of all structures during dynamic analysis.

Solve 1 more question and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

Given a structure with varying modal contributions: Mode 1 contributes 40%, Mode 2 contributes 30%, and Mode 3 contributes 25%. Compute the total contribution and discuss implications for engineering assessments.

💡 Hint: Add the contributions to find the total.

Question 2

In an analysis, a structure with a total of 5000 kg mass exhibits a modal mass of 4600 kg in the first three modes. What percentage of the total mass does this represent? Discuss the significance in designing for seismic responses.

💡 Hint: Use the formula: (modal mass / total mass) * 100.

Challenge and get performance evaluation