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Indiana State Fair (Wind?) Rig Collapse

Indiana State Fair (Wind?) Rig Collapse

RE: Indiana State Fair (Wind?) Rig Collapse

Not just wind.  Notice the wet ground and wet people.

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Indiana State Fair (Wind?) Rig Collapse

Wasn't there a thread here recently where someone was asking questions regarding stage rigging and trusswork?

Mike McCann
MMC Engineering

 

RE: Indiana State Fair (Wind?) Rig Collapse

AAH, but the value of proofreading copy...

Obviously, from this report heading, the stage was not "staked" down.  Hence the collapse.  Such precise reporting...


Quote:


As Sugarland prepares to stake stage, massive stage collapses
Last Updated: Saturday, August 13, 2011
0ShareINDIANAPOLIS (AP) --  
Authorities say they have confirmed at least three deaths after a stage collapsed during a storm at the Indiana State Fair, where the country group Sugarland was set to perform.

About two dozen people have been reported injured in the Saturday night iincident at the fairgrounds in Indianapolis.

Strong winds caused the stage rigging for the outdoor concert to collapse, trapping and injuring concert-goers shortly before 9 p.m.

Indiana State Police did not immediately return phone messages to The Associated Press. But the Indianapolis Star and WTHR are reporting that three people have died.

They initially were reporting that four had died, but later changed their reports to three dead based on information released by authorities.

 

Mike McCann
MMC Engineering

 

RE: Indiana State Fair (Wind?) Rig Collapse

I've looked at the news reports and still can't figure out, was this a temporary or permanent structure?

RE: Indiana State Fair (Wind?) Rig Collapse

(OP)
It has all the looks of being temporary, but I don't know.

RE: Indiana State Fair (Wind?) Rig Collapse

How do you lower a roof
>while in a windstorm that threatens the roof<
without getting killed yourself?

 

Mike Halloran
Pembroke Pines, FL, USA

RE: Indiana State Fair (Wind?) Rig Collapse

One of the main problems was a slow response by the people in charge. A severe storm warning had been issued about 25 minutes before the collapse, but officials did not warn the crowd until a few minutes before the wind hit. People had started to leave but with a large crowd they did not have time to get to safety.

RE: Indiana State Fair (Wind?) Rig Collapse

These winds were reportedly in the 60 mph range from what I heard.

Mike McCann
MMC Engineering

 

RE: Indiana State Fair (Wind?) Rig Collapse

For example(by no way connected to the discussed accident) the technical info sheet available from one maker's website : www.milosgroup.com/en/getFile/189 says

Quote:

All roof systems are constructed according to DIN4112 standards and are rated up to 72 Km/h [44.7 mph] wind loading. In the event of wind speeds in excess of the specified rating it is
necessary to remove the canopy and side curtains.

which seems to confirm what the Wall Street Journal article was saying.



 

RE: Indiana State Fair (Wind?) Rig Collapse

According to http://www.theindychannel.com/news/28866231/detail.html , "the Indiana Occupational Safety and Health Administration is investigating the contractor responsible for temporary structure, Greenfield-based Mid-America Sound Corp".

A short description of the structure is available at : http://midamericasound.com/wp-content/roof/html/roof1.html where they say "Our roof systems are designed and built by James Thomas Engineering".

James Thomas Engineering's catalogue is available at http://www.jthomaseng.com/pdffiles/!JTE%20Brochure%202006.zip which says

Quote:

As noted in "Safety Notes" on page 2. If the truss is to be used outdoors then the whole system must be restrained against wind loading on the truss; Please refer to "Guy Wire set" sheet.

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