The catastrophic failure of the Tacoma Narrows Bridge in 1940 is a well-known example of the results of wind-induced osc

[answerhappygod]

The Catastrophic Failure Of The Tacoma Narrows Bridge In 1940 Is A Well Known Example Of The Results Of Wind Induced Osc 1 (185.75 KiB) Viewed 12 times

The catastrophic failure of the Tacoma Narrows Bridge in 1940 is a well-known example of the results of wind-induced oscillations. What mode or type of flow induced vibration caused this failure, describe with diagrams how the shape of the deck section contributed to this failure and how the design of the new one contributed to resolving the problem. There are various methods for reducing flow-induced vibration caused by vortex shedding on existing structures, show by diagram two of these methods. The signpost of a fast food restaurant consists of a hollow steel cylinder of height h, inside diameter d and outside dimeter D, fixed to the ground and carries a concentrated mass, M, at the top. It can be modelled as a single degree of freedom spring mass damper system with an equivalent viscous damping ratio of 0.1 for analysing its transverse vibration characteristics under wind excitation. Determine the following; 1. The natural frequency of transverse vibration of the signpost. 2. The wind velocity at which the signpost undergoes maximum steady state displacement. 3. The maximum wind induced steady state displacement of the signpost C=drag coefficient 1.0, p = fluid density = 1.23 kg/m². Strouhal number = 0.2 =