3.4 - Measurement and Estimation of Damping
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Practice Questions
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What is the Free Vibration Decay Method?
💡 Hint: Think about how vibrations reduce after a push.
What does Ambient Vibration Analysis measure?
💡 Hint: Consider how trees sway in the wind.
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Interactive Quizzes
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What is the Free Vibration Decay Method used for?
💡 Hint: Focus on the vibrations' behavior after a disturbance.
True or False: Forced Vibration Tests are used when external forces are unknown.
💡 Hint: Think about the nature of the tests.
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Challenge Problems
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A structural engineer is evaluating a building's damping. After performing a Free Vibration Test, they observed the amplitude reduced from 15 cm to 3 cm after 10 cycles. Determine the damping ratio using the logarithmic decrement formula.
💡 Hint: Follow the steps of logarithmic calculations and use the proper formula for damping ratio.
During a seismic analysis, an engineer finds that a structure has a damping ratio of 0.05 based on code recommendations. If the design forces are based on this ratio, evaluate the safety implications of not adhering to the code guidelines.
💡 Hint: Consider the possible consequences of inadequate design regarding dynamic loads.
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