What was the primary design change implemented by Leon Moisseiff to reduce the cost of the Tacoma Narrows Bridge, and how did this contribute to its collapse?

Moiseiff used plate girders instead of traditional trusses, which made the bridge lighter and cheaper but also more susceptible to aerodynamic forces.

What is aeroelastic flutter, and how did it contribute to the Tacoma Narrows Bridge collapse?

Aeroelastic flutter is a phenomenon where wind interacts with a structure, causing self-excited oscillations. In the case of the Tacoma Narrows Bridge, the wind created swirling air currents that made the bridge twist, eventually leading to its collapse.

Before its collapse, the Tacoma Narrows Bridge was nicknamed 'Galloping Gertie.' Why was it given this nickname?

The bridge was nicknamed 'Galloping Gertie' because of its unusual vertical movement, especially on windy days, which made it appear as if it was 'galloping' in the wind.

What key lesson regarding bridge design did engineers learn from the collapse of the Tacoma Narrows Bridge?

Engineers learned the importance of considering wind effects and aerodynamics in bridge design, leading to the now-standard practice of wind tunnel testing for new bridge designs.

Which of the following was NOT a measure taken to try and stabilize the Tacoma Narrows Bridge before its collapse?

Adding dampers to absorb the energy of the oscillations

Tacoma Narrows Bridge Collapse Lesson Plan for Grade 11th Grade

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Learning Objective

I can analyze the engineering failures that led to the collapse of the Tacoma Narrows Bridge.

1
The Tacoma Narrows Bridge collapsed due to a phenomenon called aeroelastic flutter, which caused the bridge to twist violently in the wind.
2
A key design flaw of the Tacoma Narrows Bridge was the use of plate girders instead of more traditional trusses, making it more susceptible to wind effects.
3
Following the collapse, wind tunnel testing became a standard practice in bridge design to identify and address potential aerodynamic issues.

Tacoma Narrows Bridge Collapse

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Learning Objective

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Key Concepts

Practice Questions

Exit Ticket

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