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Tacoma Narrows Bridge
called vortex-induced vibration. Transactions of the American Society of Civil Engineers,. The plate girder was abandoned in suspension-bridge design. It opened to traffic on July 1, 1940, and dramatically collapsed into Puget Sound on November 7 of the same year. That explanation stuck for decades, even though the Federal Works Administration concluded that resonance was an improbable explanation.
The first studies concluded on November 2, 1940five days before the bridge collapse on November. This produced a "lock-on" event. Engineer Leon Moisseiff who consulted on the Golden Gate Bridge in San Francisco countered with a novel and aesthetically pleasing design that replaced the trusses with 8-foot-high plate girders, lowering the construction costs to 8 million but providing much less resistance to bending and twisting.
2 Several noted bridge engineers, including Joseph. On the morning of November 7, 1940 shortly after.m., a critical event occurred. On hands and knees most of the time, I crawled 500 yards or more to the towers My breath was coming in gasps; my knees were raw and bleeding, my hands bruised and swollen from gripping the concrete curb Toward the last, I risked rising. The true culprit was the twisting motion he had observed both in his early models and on bridge itself the day of the collapse. With only the 8-foot (2.4 m) deep plate girders providing additional depth, the bridge's roadway section was also shallow. University of Washington Special Collections. An entire generation of suspension-bridge designer-engineers forgot the lessons of the 19th century. Map in what different ways is the showing location of the bridge. In many physics textbooks, the event is presented as an example of elementary forced resonance ; the bridge collapsed because normal speed winds produced aeroelastic flutter that matched the bridge's natural frequency. This increased beyond the bridge structure strength to resist.
Tacoma, narrows, bridge - Wikipedia
Tacoma, narrows, bridge (1940) - Wikipedia
Tacoma, narrows, bridge collapses
Tacoma, narrows, bridge
Tacoma, narrows, bridge - TripAdvisor