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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. [1]
Ibrahim and Yang Lu, an associate professor of civil engineering at Boise State and an expert in forensic analysis of failed structures, both referenced the 1940 collapse of the Tacoma Narrows ...
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 ...
Vortex shedding was one of the causes proposed for the failure of the original Tacoma Narrows Bridge (Galloping Gertie) in 1940, but was rejected because the frequency of the vortex shedding did not match that of the bridge. The bridge actually failed by aeroelastic flutter. [2]
Another bridge was completed to carry eastbound traffic in 2007. In response to concerns after the failure of the Tacoma Narrows Bridge in 1940 and a major San Francisco Bay windstorm in 1951, the Golden Gate Bridge, for which Moisseiff had served as a consulting engineer during construction, was briefly closed.
The failure of the original Tacoma Narrows Bridge was originally attributed to excessive vibration due to vortex shedding, but was actually caused by aeroelastic flutter. Kármán turbulence is also a problem for airplanes, especially when landing.
His expertise was instrumental in discovering the effect of aerodynamic forces on the bridge, causing its unusual "galloping" behavior and eventual collapse. Along with Civil Engineers Othmar Amman and Glenn B. Woodruff, he published the report "The Failure of the Tacoma Narrows Bridge" [15] on March 28, 1941.
The failure of the 1940 Tacoma Narrows Bridge, along with the design of the 1950 Tacoma Narrows Bridge, led to a number of firsts in suspension bridge design. The 1950 bridge was the first to be designed and tested in wind tunnels, and was the first suspension bridge designed and built with hydraulic motion damping devices.