ENGINEERING ETHICS: THREE CASE STUDIES
TACOMA NARROWS BRIDGE: before, during and after failure • 3 hrstransverse flexural (up and down) vibration, amplitude 1.5 ft, 35 mph wind • Wind rose to 42 mph, a midspanhanger cable broke (slipped), and the torsional mode started. Frequency 0.2 Hz, 28 ftdouble amplitude • Frequency associated with von Karman vortices at 42 mph wind: ~ 1 Hz • Federal Works …
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