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3 cards from this section. Quick, good the night before a test.
What does modal mass represent?
Think about which mass is involved in the structure's response.
Define modal contribution.
Consider how modes influence seismic events.
What does modal mass signify in structural dynamics?
Connect it back to modes of vibration.
True or False: The modal contribution is irrelevant for low-rise structures.
Reflect on the importance of all structures during dynamic analysis.
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.
Add the contributions to find the total.
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.
Use the formula: (modal mass / total mass) * 100.
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