Column vs Forklift
Column vs Forklift
(OP)
I would think the guy driving the forklift had a little extra laundry to do after he hit this column.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Column vs Forklift
RE: Column vs Forklift
I wonder if it would have survived better if it was concrete filled - I imagine it would have.
RE: Column vs Forklift
I was amazed that they pulled the forklift truck out. I would have just left the truck there and got out ASAP. They probably caused even more damage pulling the forklift truck out.
RE: Column vs Forklift
RE: Column vs Forklift
Any more out there?
Cheers,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Column vs Forklift
Unless I'm mistaken, the first may very well have been greatly aided by concrete filling. It's a hollow structural section, right? But then the load might have damaged the floor or potentially the frame (doubtful, the roof height looks to be significant).
That said, the second column failed where the concrete filling ended because W sections (I-type of any description) cannot be concrete filled, and the base protection present only helps the area it surrounds. The shear load due to a point impact is (theoretically) uniform and continuous through the section. Barring secondary deflection effects possible over long distances, the shear will cut through whatever point in the member has the least shear capacity. And no, it won't be the first location with less shear strength than the shear caused by the applied load because there must be an interaction with the point of support/restraint to enable the shearing. Weakest point, every time, or simply the closest location in a case where the section has uniform shear strength through the weaker area (as seen here).
Cheers,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Column vs Forklift
there are many ways that a building can stand up under service loads after a collapse like this. The portal frame does not necessarily need additional strength as the collapse could be prevented by bowstring action of the purlin/truss members.
Definately is a good idea to consider potential loss of an individual column but alternate load paths is generally the most appropriate manner to do this.
RE: Column vs Forklift
Huh? Way too complicated.
Nah, it was just a crappy weld from the first repair that broke when the wildman forklift driver wacked it.
Might as well paint targets on the columns when forklifts are running around.
RE: Column vs Forklift
RonRoberts: Point take, however it was no where near my longest post. Feel free to ignore my post, but personally I perfer to read longer posts. They're a great way to get insight into another engineer's thinking.
Regards,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Column vs Forklift
YS; "removing fly braces because of purlin effects"; would you explain what you mean?
RE: Column vs Forklift
Given that this describes a very typical type of construction, this is a very useful design trick!
Regards,
YS
B.Eng (Carleton)
Working in New Zealand, thinking of my snow covered home...
RE: Column vs Forklift
Knives win against cans.
RE: Column vs Forklift
Mike McCann
MMC Engineering
RE: Column vs Forklift
This is just my theory on why the damage was so bad.