Le pont du détroit de Tacoma ou pont de Tacoma, en anglais Tacoma Narrows Bridge, est un pont suspendu des États-Unis situé dans l'État de Washington et permettant de franchir le détroit de Tacoma. Construit en 2007, il double un ancien pont suspendu pour faire face à l'accroissement du trafic routier dans la région.
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25 m
The Tacoma Narrows Bridge is a pair of twin suspension bridges that span the Tacoma Narrows strait of Puget Sound in Pierce County, Washington. The bridges connect the city of Tacoma with the Kitsap Peninsula and carry State Route 16 over the strait. Historically, the name "Tacoma Narrows Bridge" has applied to the original bridge, nicknamed "Galloping Gertie", which opened in July 1940 but collapsed possibly because of aeroelastic flutter four months later, as well as to the successor of that bridge, which opened in 1950 and still stands today as the westbound lanes of the present-day two-bridge complex.
The original Tacoma Narrows Bridge opened on July 1, 1940. The original bridge received its nickname "Galloping Gertie" for the vertical movement of the deck observed by construction workers during windy conditions. While engineers and engineering professor F. B. Farquharson were hired to seek ways to stop the odd movements, months' experiments were unsuccessful. The bridge became known for its pitching deck, and collapsed into Puget Sound the morning of November 7, 1940, under high wind conditions. Engineering issues, as well as the United States' involvement in World War II, postponed plans to replace the bridge for several years; the new bridge was opened on October 14, 1950.
By 1990, population growth and development on the Kitsap Peninsula had caused traffic on the bridge to exceed its design capacity; as a result, in 1998 Washington voters approved a measure to support building a parallel bridge. After a series of protests and court battles, construction began in 2002 and the new bridge opened to carry eastbound traffic on July 16, 2007, while the 1950 bridge was reconfigured to carry westbound traffic.
At the time of their construction, both the 1940 and 1950 bridges were the third-longest suspension bridges in the world in terms of main span length, behind the Golden Gate Bridge and George Washington Bridge. The 1950 and 2007 bridges are as of 2017 the fifth-longest suspension bridge spans in the United States and the 43rd-longest in the world.
Tolls were charged on the bridge for the entire four-month service life of the original span, as well as the first 15 years of the 1950 bridge. In 1965, the bridge's construction bonds plus interest were paid off, and the state ceased toll collection on the bridge. Over 40 years later, tolls were reinstated as part of the financing of the twin span, and are at present collected only from vehicles traveling eastbound.
117 m
The 1950 Tacoma Narrows Bridge is a suspension bridge in the U.S. state of Washington that carries the westbound lanes of Washington State Route 16 across the Tacoma Narrows strait, between the city of Tacoma and the Kitsap Peninsula. Opened on October 14, 1950, it was built in the same location as the original Tacoma Narrows Bridge, which collapsed due to a windstorm on November 7, 1940. It is the older of the twin bridges that make up the Tacoma Narrows Bridge crossing of the Tacoma Narrows, and carried both directions of traffic across the strait until 2007. At the time of its construction, the bridge was, like its predecessor, the third-longest suspension bridge in the world in terms of main span length, behind the Golden Gate Bridge and George Washington Bridge; it is now the 46th-longest suspension bridge in the world.
Design work on a new Tacoma Narrows Bridge began shortly after the collapse of the original bridge. However, several engineering issues, the demand on steel created by the United States' involvement in World War II, and the state of Washington's inability to find an insurer, all pushed the start of construction to April 1948. The new bridge was designed with a wider deck and taller and wider towers than its predecessor, and addressed the wind issues that led to the original bridge's collapse. It opened to the public on October 14, 1950, and carried both directions of Primary State Highway 14 for over 40 years. Tolls were charged on the bridge until 1965, when the bonds were retired 13 years ahead of schedule. “The price tag for construction -- $11.2 million -- was one-third more than the Toll Bridge Authority estimated. The final construction cost estimate, made just prior to the bond issue, reached $13,738,000.”
By 1990, population growth and development on the Kitsap Peninsula caused vehicular traffic on the bridge to exceed its design capacity. In 1998, voters in several Washington counties approved an advisory measure to create a twin bridge to span the Tacoma Narrows. After a series of protests and court battles, construction began on the second span in 2002. The second span opened in July 2007 to carry eastbound traffic, and the 1950 bridge was reconfigured to carry westbound traffic.
160 m
The 1940 Tacoma Narrows Bridge, the first bridge at this location, was a suspension bridge in the U.S. state of Washington that spanned the Tacoma Narrows strait of Puget Sound between Tacoma and the Kitsap Peninsula. It opened to traffic on July 1, 1940, and dramatically collapsed into Puget Sound on November 7 of the same year. The bridge's collapse has been described as "spectacular" and in subsequent decades "has attracted the attention of engineers, physicists, and mathematicians". Throughout its short existence, it was the world's third-longest suspension bridge by main span, behind the Golden Gate Bridge and the George Washington Bridge.
Construction began in September 1938. From the time the deck was built, it began to move vertically in windy conditions, so construction workers nicknamed the bridge "Galloping Gertie". The motion continued after the bridge opened to the public, despite several damping measures. The bridge's main span finally collapsed in 40-mile-per-hour winds on the morning of November 7, 1940, as the deck oscillated in an alternating twisting motion that gradually increased in amplitude until the deck tore apart. The violent swaying and eventual collapse resulted in the death of a cocker spaniel named "Tubby", as well as inflicting injuries on people fleeing the disintegrating bridge or attempting to rescue the stranded dog.
Efforts to replace the bridge were delayed by US involvement in World War II, as well as engineering and finance issues, but in 1950, a new Tacoma Narrows Bridge opened in the same location, using the original bridge's tower pedestals and cable anchorages. The portion of the bridge that fell into the water now serves as an artificial reef.
The bridge's collapse had a lasting effect on science and engineering. In many physics textbooks, the event is presented as an example of elementary forced mechanical resonance, but it was more complicated in reality; the bridge collapsed because moderate winds produced aeroelastic flutter that was self-exciting and unbounded: for any constant sustained wind speed above about 35 mph, the amplitude of the flutter oscillation would continuously increase, with a negative damping factor, i.e., a reinforcing effect, opposite to damping. The collapse boosted research into bridge aerodynamics-aeroelastics, which has influenced the designs of all later long-span bridges.
1.6 km
The Tacoma Narrows, a strait, is part of Puget Sound in the U.S. state of Washington. A navigable maritime waterway between glacial landforms, the Narrows separates the Kitsap Peninsula from the city of Tacoma.
The Narrows is spanned by the twin Tacoma Narrows Bridges. An earlier bridge collapsed shortly after it opened.
In 1841 Charles Wilkes, during the United States Exploring Expedition, named the strait simply Narrows. Its name was formally set as The Narrows by Henry Kellett during the British Admiralty chart reorganization of 1847.
2.1 km
Tacoma Narrows Airport is a county-owned, public-use airport located 5 mi west of the central business district of Tacoma, a city in Pierce County, Washington, United States. It is situated south of Gig Harbor, Washington, one mile southwest of the Tacoma Narrows Bridge. The airport was owned by the city of Tacoma until 2008, when it was purchased by Pierce County.
It is included in the Federal Aviation Administration National Plan of Integrated Airport Systems for 2019–2023, in which it is categorized as a local general aviation facility. There is no commercial airline at this airport; the closest airport with commercial airline service is Seattle–Tacoma International Airport, about 18 miles to the northeast.
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