Another reason to keep the tension on those guy wires at specified values.
You keep them sloppy and loose you get those oscillations. I visited a
station in the 2000s with a rotating tower and was amazed how loose the guys
were. Several years later that tower came down in a storm.
Bill K4XS
In a message dated 12/10/2013 1:46:18 P.M. Coordinated Universal Tim,
jimlux@earthlink.net writes:
The Tacoma Narrows bridge did not fail because it wasn't strong enough.
It failed because it wasn't *stiff* enough and the design had
significant wind induced torsional loads. One might say that the "Q"
was too high, although the aerodynamic design was also such that the
wind excited the oscillation in the first place.
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