A Review of Major Bridge Collapses and Why

But none are so serious and there is nothing that will have that effect. Why is this? Since the collapse of the Tacoma narrow bridge, many engineers have worked hard to ensure that such destructive behavior will not be replicated in future projects. To alleviate the effects of wind loads and to help more stable support beams and stronger reinforcement, install the dynamic characteristics of the arrows of the bridge arrows when needed in strong wind conditions. Although they can not be prevented completely, efforts have been made to reduce the number of collapse due to long-term wind loads.

Because it is the country's first aluminum painted bridge, the US Highway 35 Bridge called "Silver Bridge" is the main transport route between West Virginia and Ohio. At peak time, the bridge suddenly collapsed into the Ohio River, and 75 cars were flooded. 46 people were killed in this tragedy, 9 people were seriously injured. The cause of breakage is stress corrosion and corrosion fatigue. A few years before the collapse, a small crack appeared on the suspended chain of the bridge, and the crack grew steadily as time passed. However, the inspector of the bridge did not notice it. Because this technique did not allow inspectors to see cracks.

After the collapse of the Mississippi River Bridge in Minnesota State I-35 W in August 2007, delinquency in the maintenance and management of national roads and bridges became a problem of transportation funds. Due to this collapse, tax revenues in Minnesota province increased and other state measures such as bridge repair and the Massachusetts State Accelerator Bridge Project accelerated, but after the discussion the federal funds did not increase. In 2013, the I-5 Skagit River Bridge collapsed due to a collision with a skyscraper track, emphasizing the "broken important" bridge in which complete collapse occurred due to breakage of only one structural member. According to the National Bridge List, if there is no preventive maintenance, at least 60 thousand bridges over 20 feet in the United States will deteriorate. In December 2008, 72,868 bridges in the United States (12.1%) were classified as "structural flaws" and an estimated $ 48 billion was repaired.

After the collapse, the United States participated in the Second World War and postponed the plan to exchange bridges. The part of the bridge that still remains after the collapse, including the tower and cable, has been removed and sold as scrap metal. About 10 years after the collapse, the new Tacoma Channel Bridge opened to the same place using the original pylon base and cable fixing point. The part of the bridge that falls into the water now functions as an artificial coral reef. The collapse of the bridge had a permanent impact on science and engineering. In many physics textbooks, this event is used as an example of basic forced resonance, but the aerodynamic elastic flutter generated at normal wind speed coincides with the natural frequency of the bridge, so the bridge collapses . This collapse promoted the study of the aerodynamics of the bridge - aeroelasticity, which affected the design of all the long bridges afterwards.