The Tacoma Narrows Bridge, nicknamed "Galloping Gertie", collapsed on November 7, 1940 due to aeroelastic flutter caused by 42 mph winds. The original bridge cost $7 million to build but was completely destroyed in the collapse. A replacement bridge was built and opened in 1950 at a cost of $15 million. The science of bridge aerodynamics was established as a result of investigating the collapse of the original Tacoma Narrows Bridge.

1. Tacoma Narrows Bridge-
“Galloping Gertie”
TAYLOR LESZCZYNSKI PM3225
VICKI WELTON JANUARY 12, 2015
JEREMY HEINZ

2. Introduction

3. History
 You'll find the "Tacoma Narrows" in western Washington State in the Pacific
Northwest.
 It's located some 8 miles west of downtown Tacoma.
 Construction Started September 1938.
 The bridge was idea since 1889.
 November 7, 1940; was the fateful day of the collapse.
 The replacement bridge was opened October 14, 1950.

4. Original Project p.1
 The bridge was designed by Leon Moisseiff.
 concerted efforts began in the mid-1920s, with a Northern Pacific Railway
proposal for a trestle
 The third-longest suspension bridges in the world in terms of main span length,
behind the Golden Gate Bridge and George Washington Bridge
 Tolls were charged on the bridge for the entire four-month service life of the
original span.

5. Original Project p.2
 The first Tacoma Narrows Bridge opened to traffic on July 1, 1940.
 There was noticeable issues with the bridge right away.
 It received its nickname "Galloping Gertie"
 because of the vertical movement of the deck observed by construction workers during
windy conditions.
 The original bridge was only operational for 4 months.

6. Errors
 During construction- the walls were made of solid steel causing no wind flow or
“the bounce” control

7. Proposed Solutions
 Added Cables to steady “the bounce.”
 It was a temporary fix
 Added Hydraulics buffers
 4 buffers were added to act as shock absorbers
 No effects were given

8. The Disaster
 The bridge collapsed November 7, 1940, at 11:00 AM (Pacific time)
 Due to a result of aeroelastic flutter caused by a 42 mph (68 km/h) wind.
 No Human was injured
 Only death was a cocker spaniel.

9. The Carnage
 Original cost of the bridge
 $ 7 million
 Bridge was completely totaled.
 Damages Cost/ Rebuild $15 million
 Only reusable parts were the piers
 Bridge Insured for $5.2 million (80% of full value)

10. The Replacement
 Sturdy Gertie
 Opened: October 14, 1950 (westbound),
July 15, 2007 (eastbound)
 Is a twin suspended bridge Nicknamed the Westbound and Eastbound
 Tolls were charged on the bridge for the first 15 years…
 To help pay for:
 bridge's construction bonds
 Interest fees
 Over 40 years later, tolls were reinstated as part of the financing of the twin span,
and are presently collected only from vehicles traveling eastbound.

11. Conclusion
 The science of Bridge Aerodynamics was born after the Tacoma Narrow’s bridge
collapsed.
 This large tragedy was a big wake up call to safety measures.
 The Replacement bridge has now stood for 55 years this October with its new
expansion holding steady for 8 years come July.
 Eastbound only: Now 2015 1940
$5.50 (cash/credit price) .75$ 1way 1.25$ roundtrip
$4.25 (transponder price)
$6.25 (pay by mail)
 A derailed successful project, with a 2.0 edition.

12. Reference
 https://www.youtube.com/v/XggxeuFDaDU
 http://www.wsdot.wa.gov/TNBhistory/
 http://www.wsdot.wa.gov/TNBhistory/Connections/connections3.htm