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Author Topic: Another stage collapse  (Read 2642 times)

Peter Morris

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Another stage collapse
« on: December 17, 2017, 11:26:51 pm »


https://g1.globo.com/rs/rio-grande-do-sul/noticia/desabamento-de-palco-em-festa-rave-causa-morte-e-deixa-feridos-em-esteio.ghtml

"A person died due to the collapse of the stage of the party rave Atmosphere, provoked by the strong wind, in the afternoon of this Sunday (17), in the Park of Exhibitions Assis Brazil, in Esteio, Metropolitan Region of Porto Alegre. According to the Civil Police, the victim was identified as 30-year-old Kalleby Freitas da Rosa.

The fact happened around 2pm. Kalleby - who signed as "Kaleb" - was a DJ, and performed at the party when the structure collapsed. Three other people were lightly injured and were taken to So Camilo Hospital in Esteio. According to the Civil Defense, there were between 4 thousand and 5 thousand people in the event."

Area was isolated for the work of the expertise. Firefighters claim that the event had all the necessary reports, but since the site is an open area, the wind has exceeded the structure's sustaining capacity.

The coordinator of the Civil Defense of Esteio, Alexandre Camboa, affirmed that the structure of the event was regularized. "We had access to the documents and everything was correct," he said.

However, Camboa stressed that due to the weather alert, the event could have been cancelled. At the time of the accident, he said, the wind at Esteio was 55 km / h at the time of the accident. "It is being warned since Thursday that we would have severe events of wind, hail and torrential rains on Thursday and Sunday afternoon," he says."


https://www.youtube.com/watch?v=IftK_321F-Q
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Tim McCulloch

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Re: Another stage collapse
« Reply #1 on: December 18, 2017, 12:06:36 am »

And like in Indiana (State Fair, Sugarland performance), presumably a commercial decision to remain "open" in spite of obvious danger to talent, staff and audience.

While the Indiana roof was compromised by the guy wire "anchorage" and undersized guy wires, the structure was ultimately subjected to wind loading higher than the design limit, somebody *knew* the approaching storm would exceed that limit.  Ditto for this Atmosphere show.  They knew the winds would exceed the design limits and continued anyway.

Bah, humbug.

Tim "nobody should die for a good time" Mc
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"Practicing an art, no matter how well or badly, is a way to make your soul grow, for heaven's sake. Sing in the shower. Dance to the radio. Tell stories. Write a poem to a friend, even a lousy poem. Do it as well as you possible can. You will get an enormous reward. You will have created something."  - Kurt Vonnegut

Taylor Hall

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Re: Another stage collapse
« Reply #2 on: December 19, 2017, 04:32:45 pm »

I just heard about this today, the videos are truly frightening. I'm amazed that only one person was killed, with as many people that were both on stage and close by it, it had all the makings of another Indiana Fair.

Here's another video with multiple angles. The bit at the beginning gives me chills. :S

https://www.youtube.com/watch?v=DXo5S1XeLQE
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Tim McCulloch

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Re: Another stage collapse
« Reply #3 on: December 19, 2017, 06:27:20 pm »

I just heard about this today, the videos are truly frightening. I'm amazed that only one person was killed, with as many people that were both on stage and close by it, it had all the makings of another Indiana Fair.

Here's another video with multiple angles. The bit at the beginning gives me chills. :S

https://www.youtube.com/watch?v=DXo5S1XeLQE

Beginning at 0:47 you can see the skins break away but it's too late, the structure has started its 'deflection of death' and it collapses less than 10 seconds later.
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"Practicing an art, no matter how well or badly, is a way to make your soul grow, for heaven's sake. Sing in the shower. Dance to the radio. Tell stories. Write a poem to a friend, even a lousy poem. Do it as well as you possible can. You will get an enormous reward. You will have created something."  - Kurt Vonnegut

Milt Hathaway

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Re: Another stage collapse
« Reply #4 on: December 19, 2017, 08:40:14 pm »

Oddest thing about this one is it appeared to shear off leaving the uprights in place. I've seen plenty of truss bend, but never just sheer off like that.
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Peter Morris

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Re: Another stage collapse
« Reply #5 on: December 19, 2017, 11:23:48 pm »

Whats interesting for me - having been the person supplying equipment when there have been forecasts for bad weather is the discussions I have had with some of the event organisers.

Often they will try to pass the responsibility on to others so its not their responsibility if something collapses or they have to cancel the show.

I always put in writing what needs to be done (by them) and the wind rating of the structure e.g. Line-array tower.  They are in control of the event where, how and when it is set up, and they are the ones that can cancel the show not the PA company.  The PA Company obviously has an obligation to inform the event organisers of the equipment limitations and safety requirements etc.

What worries me as someone who has expertise (Mechanical Engineer) in crane design and the wind load calculations is some of the truss structures I see on Facebook and other media its often hard to tell but many of them dont look very safe. (Where appropriate I comment politely)

What a lot of people dont realise is the force of the wind on a structure is proportional the wind speed squared; going from 30 mph to 50 mph wind speed is a big difference! 

Just an interesting point the maximum stress on a tower cranes the you see building multi-story buildings come from the wind loading in a storm (in my case 150km/hr) not the maximum load it can lift.

https://www.youtube.com/watch?v=X9w5RNTVhXA
https://www.youtube.com/watch?v=vjqtk03wkTw
https://www.youtube.com/watch?v=Hc_lho0RKTw
« Last Edit: December 19, 2017, 11:50:55 pm by Peter Morris »
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ProSoundWeb Community

Re: Another stage collapse
« Reply #5 on: December 19, 2017, 11:23:48 pm »


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