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5 cards from this section. Quick, good the night before a test.
What is the Free Vibration Decay Method?
Think about how vibrations reduce after a push.
What does Ambient Vibration Analysis measure?
Consider how trees sway in the wind.
What is the Free Vibration Decay Method used for?
Focus on the vibrations' behavior after a disturbance.
True or False: Forced Vibration Tests are used when external forces are unknown.
Think about the nature of the tests.
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.
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.
Consider the possible consequences of inadequate design regarding dynamic loads.
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