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RE: Fork Lift Loads

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	For the concentrated loads I usually lookup the specifics on what I 
anticipate to be the approximate maximum size forklift that will be used. I 
 usually start with Hyster ( as their website lists quite a 
bit of data on their various forklift models. Usually I'm looking for max 
front axle load on a particular class of forklift and the wheel spacing. To 
 approximate the contact area you need to know (guess) the type of tire 
being used (pneumatic, solid, cushion etc.). For pneumatics I use the tire 
pressure to approximate the contact area, for the others I try to 
conservatively select a "pseudo" tire pressure in the range of 100-200psi 
and go from there. Sometimes it helps to find out the tire width to keep it 
 all in perspective. If you are going to be using some form of heavy duty 
bar grating the width of your contact area is going to determine the number 
 of bearing bars sharing the concentrated load so you'll want to be 
conservative, for other situations the actual contact area is not quite as 
critical. If you can get a copy of Designing Floor Slabs on Grade by Ringo 
and Anderson they go over these same assumptions in more detail. Hope this 

	- Thanks
	  Michael James, PE

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of lrhauer(--nospam--at) Sent: Friday, March 22, 2013 4:44 PM
To: seaint-seaosc(--nospam--at)
Subject: [SEAINT-SEAOSC] Fork Lift Loads

To All,

I am designing a steel grating floor system over a pit where the owner 
wants the grating and support beam system to carry fork lift loads but does 
 not know what the fork lifts and load weights will be.

Any suggestions on what I should use as a uniform psf load and also a 
concentrated load and over what tributary??

Thanks in Advance,

Larry Hauer, S.E.

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