The Tacoma Narrows Bridge, also known as the Galloping Gertie, was one of the most famous causes of structural failure in the world. The idea to build the bridge originated in 1889 with a trestle proposal from the Northern Pacific Railway. Then, after a few years of concreting and construction at a cost of over 6,400,000 dallors, the bridge was built and became the third longest and most flexible suspension bridge in the world of its time in the 1900s with a total length of 1810 m. It was designed as a double suspension bridge located between Tacoma and the Kitsap Peninsula in the United States. The Tacoma Narrows Bridge opened to traffic on July 1, 1940. After being in service for 129 days, unfortunately, the failure occurred late in the morning of November 7, 1940, during high wind conditions. Then a new bridge was built as a replacement, opening in 1950 and still remaining today the westbound lanes of the current twin bridge complex. Compared to other types of bridges, the suspension bridge can cover the longest distance without using a lot of materials. However, if the issue of stiffness was not fully considered, vibrations would occur on the bridge deck under high winds. A few weeks after the operation of the Tacoma Narrow Bridge, the oscillation of the bridge began and its oscillation continued to increase day by day. So engineers tried to build more cables between the bridges, but without success. After four months of construction of the Tacoma Narrows Bridge, the bridge, which normally vibrated in a vertical motion, began to oscillate with the opposite side out of phase (twisting pattern), in a 40 mph wind. Due to the extremely violent oscillation, the rupture occurs in the middle of paper......e, wind tunnel tests must be carried out to verify the design of the new bridge before its construction. As an example of resonance, the destruction of the Tacoma Narrows Bridge remains a favorite of engineering educators at all levels. Recent studies show that the movement of the bridge cannot be explained simply as a resonance experiment in a school laboratory. The interactions of forces, especially in a dynamic situation, become much more complex. This was not anticipated by the bridge designers when they used new methods for a lighter, more flexible bridge design. However, the fact that it took around 50 years before a more convincing theory of the bridge's destruction was developed goes some way to exonerating the original designers and gives much food for thought to future bridge designers. bridges..