Tacoma Bridge Failure-- a Physical Model

Details Tacoma Bridge Failure-- a Physical Model Tacoma Bridge Failure-- a Physical Model

2004-08-22

arxiv.org/abs/physics/0408101v1

Physics

Fluid Dynamics

submitted to American Journal of Physics

Scientific paper

The cause of the collapse of the Tacoma Narrows Bridge has been a topic of much debate and confusion since the day it fell. Many mischaracterizations of the observed phenomena have limited the widespread understanding of the problem. Nevertheless, there has always been an abundance of evidence in favour of a negative damping model. Negative damping, or positive feedback, is responsible for many large amplitude oscillations observed in many applications. In this paper, we will explain some well-known examples of positive feedback. We will then present a feedback model, derived from fundamental physics, capable of explaining a number of features observed in the instabilities of many bridge decks. This model is supported by computational, experimental and historical data.

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