Forkligt Impact Loading
Forkligt Impact Loading
(OP)
Has anyone ever come across any information on loads a forklift could create by running into the structure? I came across an Australian study that used a 1kip point load in the horizontal direction. This sounds reasonable just wanted to see what else is out there.






RE: Forkligt Impact Loading
You can calculate the theoretical max from the same formulae used for impacts onto a barrier; Just involves the speed, mass (weight), and the deflection under the anticipated load.
Cheers,
YS
B.Eng (Carleton), P.Eng (Ontario), MIPENZ (Structural-New Zealand)
Working in Canada, and missing my adoptive New Zealand family... at least I brought the little Kiwi with me!
RE: Forkligt Impact Loading
If you were to model a building column, say a 6 inch steel tube, and put a horizontal 1 kip load on it - the deflection would be a fraction of an inch.
I've seen columns hammered by forklifts before and they go beyond the elastic zone and are deformed by multiple inches.
RE: Forkligt Impact Loading
RE: Forkligt Impact Loading
RE: Forkligt Impact Loading
Do the physics of F=ma and figure out how far the forklift would have to go before it stopped under a 1 kip force and I think you'll see it has gone all the way through the column.
I believe vehicular barriers are based on a 6k force, and they are designed to yeild so they sustain significant amount of damage and displacement under that loading.
RE: Forkligt Impact Loading
http://www
These pictures should give you a warm fuzzy feeling about a 1 kip point load.
RE: Forkligt Impact Loading
RE: Forkligt Impact Loading
We have a forum672: Shipbuilding & Watercraft engineering forum. This would be a more appropriate place for your question.
The quick answer is that the Titanic was scraped lightly on the side to a length of around 300feet. This opened up six holds. The Titanic was designed to float with the first four holds flooded. A direct hit on the iceberg would have destroyed more metal structure and people would have spilled drinks, but the ship would have remained afloat.
Is the OP asking the correct question? I would want to know what the kinetic energy of a moving forklift was, not the force.
RE: Forkligt Impact Loading
RE: Forkligt Impact Loading
Then iterate deflection and determine how much load would be required to create that deflection. Determine potential energy. F*deflection.
When potential equals kinetic, the corresponding load for that deflection is your answer.
This answer will vary based on stiffness of impacted object. Stiffer/stronger objects will see larger loads, softer/flexible objects will see less load.
RE: Forkligt Impact Loading
There's no mystery here: If you want no plasticity, set your mu to 1 in the formulae, and implement the 95% of the maximum speed of the forklifts, with 95% of the maximum factored load. Then you simply work out the deflection for your column.
It will be huge, as it should be. And it will be fictitious unless you concrete fill, or encase, since it's going to rip under point loading.
Regards,
YS
B.Eng (Carleton), P.Eng (Ontario), MIPENZ (Structural-New Zealand)
Working in Canada, and missing my adoptive New Zealand family... at least I brought the little Kiwi with me!