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lousmith84
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re: Engineering disasters: the Indiana stage collapse
lousmith84   9/2/2011 2:24:29 PM
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wind tunnel load testing, idiots

TFCSD
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re: Engineering disasters: the Indiana stage collapse
TFCSD   8/23/2011 6:56:02 PM
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From camping with pop-up canopies you find out the you need two guy wires per corner or it will collapse or fly off the same way in the wind. Another way is to put guy wires in Xs on 5 sides of the cube and nail that puppy down. Use both techniques and that canopy will not budge much. The fact that these guy wires where not put on should be looked into.

Karl P.E.
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re: Engineering disasters: the Indiana stage collapse
Karl P.E.   8/23/2011 5:52:27 PM
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I didn't see any rigid cross bracing or guy cables that should have prevented sway or buckling of the support columns. Once the back edge dropped the next row of supports tilted forward and everything else then went forward and down to the stage platform.

RogerAF
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re: Engineering disasters: the Indiana stage collapse
RogerAF   8/20/2011 4:01:45 PM
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I have seen stage rigging that was suspended from a large crane. In case of emergency it could swing the entire structure away from the audience. That was back in the early 1980s.

Abenaki
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re: Engineering disasters: the Indiana stage collapse
Abenaki   8/20/2011 1:05:02 AM
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Could have been a resonant oscillation in the canopy and a particular wind speed and direction. In my experience with airfoils, these can grow exponentially and quickly blow up a structure.

agk
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re: Engineering disasters: the Indiana stage collapse
agk   8/19/2011 10:17:05 AM
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I feel this stage is built by freshers. The experts look for all these kind of troubles before hand and give provisions to handle these situations safe to the lives.

anon9303122
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re: Engineering disasters: the Indiana stage collapse
anon9303122   8/18/2011 4:48:11 PM
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But most antenna towers do not have dozens of square yards of "sails" attached to them either.

brian_g
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re: Engineering disasters: the Indiana stage collapse
brian_g   8/18/2011 4:28:10 PM
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That is a good idea. Maybe they could have flags at the top of the structure that are weighted so that they only unfurl at winds above a certain speed, or a small sensor that sounds an alarm. I suppose those aren't complete solutions, but just a start.

Thomas
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re: Engineering disasters: the Indiana stage collapse
Thomas "Rick" Tewell   8/17/2011 3:58:39 PM
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Nope. Just thought since it was under "EE Life" it might ought to be. This wasn't really a blog entry either...so...just sayin'.

rmalone2
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re: Engineering disasters: the Indiana stage collapse
rmalone2   8/17/2011 3:52:45 PM
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Guy anchors can be setup quickly and economically and have proven themselves reliable in stabilizing countless numbers of guyed antenna towers in hurricane affected regions.

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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