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Tacoma Narrows bridge collapse
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Tacoma Narrows bridge collapse with explanations
Perhaps, among other things, the Tacoma Narrows Bridge
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was the most spectacular Aeolian harp in history.
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Unfortunately, its first performance was destined to run only about four months.
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In the meantime, she was a beautiful bridge.
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Beautiful, but a little strange.
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Even before construction was completed, people observed its peculiar behavior.
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That was because, even in a light breeze, ripples ran along the bridge.
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After a while, one of the local humorists called her Galloping Gertie.
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And for fairly obvious reasons, the name stuck, at least until the 7th of November, 1940.
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Then as now, Seattle and Tacoma were sports-minded cities.
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For four months, a regional sport was to drive across the bridge on a windy day.
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While some claimed it was like riding a roller coaster, others found it a little disconcerting
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to see the car in front disappear.
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How popular this bridge sport was, or to what extent it might have spread across the country,
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is anybody's guess.
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On November 7, 1940, the winds were relatively moderate, about 40 miles per hour.
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A new mode appeared.
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Rather than ripple, the bridge began to twist.
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The wind of 40 miles per hour is not too strong, but it was strong enough to start the bridge
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twisting violently.
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11 a.m., it fell.
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Investigators were mystified.
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A bridge constructed according to the best engineering standards of the day.
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Perhaps the best bridge in the world.
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This was not a bridge that was supposed to collapse.
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What in the world had happened?
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Theodore von Karman, a Caltech professor and a pioneer in modern aerodynamics, came forth with the answer.
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Von Karman's explanation of vortex shedding and resonant oscillations
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was not universally popular among construction engineers.
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However, as verified by wind tunnel tests at Caltech and at the University of Washington,
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- Idioma/s:
- Etiquetas:
- EducaMadrid
- Autor/es:
- CalPolyPomonaDemos
- Subido por:
- Samuel E.
- Licencia:
- Reconocimiento - No comercial - Compartir igual
- Visualizaciones:
- 86
- Fecha:
- 28 de octubre de 2013 - 14:10
- Visibilidad:
- Público
- Centro:
- IES JOAQUIN ARAUJO
- Duración:
- 03′ 13″
- Relación de aspecto:
- 4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
- Resolución:
- 320x240 píxeles
- Tamaño:
- 9.32 MBytes
