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Natural frequency and building response

Natural frequency and building response. structural engineers are keeping us safe. What is ground shaking?. We know that seismic waves are produced during earthquakes and cause shaking But how does this ground shaking really occur? Let’s take a look…. Frequency.

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Natural frequency and building response

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  1. Natural frequency and building response structural engineers are keeping us safe

  2. What is ground shaking? • We know that seismic waves are produced during earthquakes and cause shaking • But how does this ground shaking really occur? • Let’s take a look….

  3. Frequency • Frequency is how often a vibration occurs • A hertz is the measure of frequency and is one cycle per second • Frequency = # of cycles per second Write this down!

  4. Period of Vibration • Period is the time it takes for one full cycle • This means that period (T) = 1 / Frequency • Period (T) = 1 . Frequency Write this down!

  5. What affects frequency? • Let’s define natural frequency: Natural frequency is the frequency at which a system naturally vibrates once it has been set into motion. • It depends on the mass and stiffness of the system • Lets use the spring to help us…

  6. What does all this mean… …for earthquakes and windstorms? • Resonance occurs when the forced vibration on an object matches the natural frequency of the object… • Lets experiment and see what happens…

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