Boise Airport Hangar 7

[TigerGuy]

https://www.cityofboise.org/news/fi...veral-injuries-following-a-building-collapse/

Hangar under construction collapsed killing 3 and injuring more.

 

[EdStainless]

I'll give you 5:1 that they left out some of the temp cross bracing during erection.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[Cool_Controls]

Looks like a pre engineered structure.

 

[JLNJ]

Looks like a longspan PEMB from the photos.

 

[DrZoidberWoop]

https://www.reddit.com/r/Boise/comments/1afxoj6/hangar_under_construction_at_boise_airport/

Kind of crappy to reference reddit, but there are people there posting their dashcam screen captures of construction activities that day.

 

[Sym P. le]

Crane collapse on pre engineered structure.

 

[3DDave]

A crane falling on a building would certainly be an initiating cause of a subsequent collapse.

 

[RVAmeche]

Not a rigging guy but using multiple smaller cranes to lift a large load (if that's really the case?) sounds like a terrible idea.

 

[TugboatEng]

Tandem lifts are not uncommon. They do go wrong from time to time. Lots of planning required. Every movement must be scripted to ensure the load is shared correctly.

 

[Sym P. le]

The incident occurred approx. 5 p.m. on Jan 31. Winds above 20 mph call for reduced capacities at best. Booms do not tolerate lateral wind loading well.

[URL unfurl="true"]https://www.timeanddate.com/weather/usa/boise/historic[/url]

 

[bones206]

Especially with 5 ft deep windsail girders (edit: after looking at some other photos, maybe closer to 8 ft deep)

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1706883195/tips/72444115007-ap-boise-building-collapse_yhisdn.webp[/url]

 

[bones206]

Crane company is claiming it was a structural failure and that the crane was bent over by the collapse impact. This photo is interesting:

 

[Sym P. le]

https://www.idahostatesman.com/news/local/community/boise/article284971422.html[/URL]]Boise-based Inland Crane Inc. said in a Thursday statement that it was hired to provide its services for the project and began work Monday to help erect the steel structure with four of its cranes. By Wednesday afternoon, that work was “largely completed,” company Vice President Jeremy Haener said, with just one of its cranes still left at the job site

The crane looks rather small to cause so much damage. The open frame of the building would catch a lot of wind.

 

[phamENG]

This photo is interesting:

Pin vs Fixed base connection...be careful what you wish for...

 

[TugboatEng]

Those are some really strong anchors.

 

[bones206]

Yep, I’m sure that column base is as designed as a pin even though it’s maybe 3-4ft long. In a situation like this I would design the anchorage as fixed even with the frame designed with a pin. If this is in fact the initiating failure of the collapse, it should be a wake up call for the PEMB industry.

 

[Sym P. le]

Those are some really strong anchors.

Interesting. We should see eight anchors. There are three intact and two or three stubs.

 

[JohnRBaker]

It would seem, that since the steel flange itself failed, that having had eight anchors instead of five, that this would NOT have made any difference whatsoever.

John R. Baker, P.E. (ret)
Irvine, CA
Siemens PLM:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[JAE]

With the collapse occurring out in the main span somewhere, and the resulting total collapse of the bent, the anchors (and base plate) were subjected to a full rotation of the entire column section - not what they ever were designed for. This anchor bolt failure and tearing of the base plate is a result of the collapse, not a cause of it.

 

[3DDave]

Would that failure be at the Heat Affected Zone? Looks like it was designed as a tear-off strip. Not likely the initiating failure, but still interesting.