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The first hypothesis of the failure of the Tacoma Narrows Bridge was resonance (due to the Kármán vortex street). [29] This is because it was thought that the Kármán vortex street frequency (the so-called Strouhal frequency ) was the same as the torsional natural vibration frequency .
The first Tacoma Narrows Bridge was a suspension bridge in Washington that spanned the Tacoma Narrows strait of Puget Sound. It dramatically collapsed on November 7, 1940. The proximate cause was moderate winds which produced aeroelastic flutter that was self-exciting and unbounded, opposite to damping.
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]
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 ...
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.
Alan Thomas thought about Hawaii as he sat in traffic during the recent emergency repairs on the Tacoma Narrows Bridge. Crews on Kauai switch the direction of one of the lanes during rush hour on ...
On November 7, 1940, the low pressure system that later developed into the storm was affecting the Pacific Northwest and produced the 40 mph (64 km/h) winds that destroyed the Tacoma Narrows Bridge. On November 10 the fast-moving storm crossed the Rocky Mountains in just two hours on its way to the Midwest. [6] [7]
A pedestrian was reported in the roadway on the bridge’s east end beginning at 3:54 p.m. today, causing the right lane to be blocked, according to a post on the WSDOT Tacoma X account.