![]() Apart from the ideal default interaction, the phenomenon called aeroelastic flutter is thought to occur on the day of the collapse. The bridge, which has plate steel on both sides, established various interactions with the wind. One of them is that it has to do with the aerodynamics of the bridge. There are different debates about the twisting movement of the bridge just before its collapse. However, experts say that there is another reason for the spiral-shaped rotation in the images. It is a joint decision that this oscillation was also seen on the Tacoma Narrow Bridge on the day of the collapse. While providing this flow, the energy accumulated continues by creating vibration. One of them is to prevent the power of the wind from accumulating and to make it flow. While this situation is also seen in many long chimney-type structures, various precautions are taken. In wind and bridge, this resonance can occur from a vortex. Resonance is a periodic force that creates synchronisation with the system’s natural frequency. There are different arguments for the cause of the Tacoma Narrows Bridge destruction, one of which is the resonance issue. Eldridge Iconic collapse of the Tacoma Narrows Bridge_©James Bashford What is Behind this Collapse? (Link for the video: Tacoma Bridge Collapse: The Wobbliest Bridge in the World? (1940) | British Pathé ) Tacoma Narrows Bridge_©Clark H. This time, the image was quite remarkable on the day when the lateral shaking was also effective it is possible to access the video and photo records of this dramatic event. Fortunately, it was closed to traffic when the collapse occurred. Four months after its opening, that iconic and dramatic collapse occurred on a day with strong winds. The bridge, where the vertical shaking was felt intensely in strong winds, was closed to traffic. Even during the construction period, the flexibility of the bridge was remarkable in normal winds, and it was given the name “Galloping Gertie” by the workers. This provided the iconic ribbon steel look from the outside, but this approach had non-image consequences. Unlike other suspension bridges, plate steel was preferred instead of truss in the deck carrier part. The bridge, the third largest suspension bridge in the world when it was opened, later left this title to landmark failure in engineering history. Tacoma Narrows Bridge, the bridge connecting the mainland of Washington state and the Olympic Peninsula, was completed and opened in July 1940. Golden Gate suspension bridge_©zahid lilani Tacoma Narrows Bridge For suspension bridges, which have a lighter appearance and structure than the old rigid bridges, a different parameter emerges the wind. However, the use of less material reduces the rigidity of the structure, which requires more attention to strength against loads. Using less material in suspension bridges to cross these wide spans creates this slender and graceful image from the outside and impresses people. The most significant advantage of suspension bridges is that they are built with only two towers, and the cost is low since wide spans can be crossed using less material. In this case, the questions to be answered in bridge construction are: first, how does the bridge, together with the weight of the bridge exerted by people and vehicles, create a force against gravity? And second, how is this accomplished at an affordable price? Suspension bridges have been the answer achieved by developing engineering studies and building materials.Ī suspension bridge is a suspension of the deck with two main cables and two towers, and connecting rods, as its name suggests. The second and, in many ways, the decisive problem was to make it economical. In bridge construction, the first problem that came to mind and needed to be solved was only gravity. The need for people to work pass from one place to another without getting wet goes back a long way in history. Tacoma Narrows Bridge_©University of Washington Libraries Digital Collections Suspension Bridges | Tacoma Narrows Bridgeīridges have long been one of the main challenges of engineers.
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