|
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 (known as Primary State Highway 14 until 1964) 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 because of aeroelastic flutter four months later, as well as the replacement of the original bridge which opened in 1950 and still stands today as the westbound lanes of the present-day twin bridge complex. The original Tacoma Narrows Bridge opened on July 1, 1940. It received its nickname "Galloping Gertie" because of the vertical movement of the deck observed by construction workers during windy conditions. 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 replacement bridge was opened on October 14, 1950. By 1990, population growth and development on the Kitsap Peninsula 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 15, 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 now the fifth-longest suspension bridge spans in the United States, and the 38th-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 presently collected only from vehicles traveling eastbound. ==Original bridge== (詳細はNorthern Pacific Railway proposal for a trestle, but concerted efforts began in the mid-1920s. In 1937, the Washington State legislature created the Washington State Toll Bridge Authority and appropriated $5,000 to study the request by Tacoma and Pierce County for a bridge over the Narrows. The bridge was designed by Leon Moisseiff. The first Tacoma Narrows Bridge opened to traffic on July 1, 1940. Its main span collapsed into the Tacoma Narrows four months later on November 7, 1940, at 11:00 AM (Pacific time) as a result of aeroelastic flutter caused by a wind. The bridge collapse had lasting effects on science and engineering. In many undergraduate physics texts the event is presented as an example of elementary forced resonance with the wind providing an external periodic frequency that matched the natural structural frequency, even though the real cause of the bridge's failure was aeroelastic flutter. A contributing factor was its solid sides, not allowing wind to pass through the bridge's deck. Thus its design allowed the bridge to catch the wind and sway, which ultimately took it down. Its failure also boosted research in the field of bridge aerodynamics/aeroelastics, fields which have influenced the designs of all the world's great long-span bridges built since 1940. No human life was lost in the collapse of the bridge. The only fatality was a cocker spaniel who perished after it was abandoned in a car on the bridge by its owner, Leonard Coatsworth. Professor Frederick Burt Farquharson (an engineer from the University of Washington who had been involved in the design of the bridge) tried to rescue it, but was bitten by the terrified dog when he attempted to remove it. The collapse of the bridge was recorded on 16 mm film by Barney Elliott, owner of a local camera shop, and shows Farquharson leaving the bridge after trying to rescue the dog and making observations in the middle of the bridge. In 1998, ''The Tacoma Narrows Bridge Collapse'' was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant". This footage is still shown to engineering, architecture, and physics students as a cautionary tale. Dismantling of the towers and side spans—which survived the collapse of the main span but were damaged beyond repair—began shortly after the collapse and continued into May 1943. The United States' participation in World War II as well as engineering and finance issues delayed plans to replace the bridge. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tacoma Narrows Bridge」の詳細全文を読む スポンサード リンク
|