Vehicle wheel Loads

[enlightenme]

Dear all,

We are doin a calculation in which we have to take the wheel loads of different types of vehicles, viz. pick up truck, a 2t forklift, maintainance vehicle, truck and a 60t crane with outriggers. Can anyone please tell me where I can get these values or if you have any knowledge about it please share.

RGDS
Enlighten

 

[rb1957]

don't multi-post ...

 

[csd72]

Look up the bridge code for maximum axle loads.

Forklift is a bit more difficult but I believe as a rough approximateion you use 2.5times the weight on the front axle.

Crane loads are much more complex and you would need to check the weights of the crane with the major manufacturers as a 60ton crane does not necesarily weigh anything like 60 ton (the 60t refers to the theoretical maximum lifting capacity directly over the tail of the crane). You can then conservatively take the maximum single outrigger load as total crane weight plus lifted weight.

Axle loads for cranes are normally maxed out at the maximum axle loads allowed in the bridge code.

 

[fancypants]

Vehicles - Get the cut sheet/specs form the mfg wheel loads will be included

Forklifts, zoom booms etc.. get the cut sheet specs from the mfg. the maximum axle loads and wheel loads will be there.

Cranes - be very very care full. Go to the mgf. Tell them what is being lifted and at what radius and how much swing is going to take place. Outrigger loads can be super high when swinging a load over the outrigger. Here is a link that will get you started for Manitowoc cranes

http://www.manitowoccranes.com/site/EN/groundbearingpressure.aspx

For the cranes, do not tackle yourself unless you know exactly what you are doing.

 

[msquared48]

The outrigger loads of large creanes are huge punching shear cosiderations. Go to a manufacturer for this information. You may need to place load limits and placement locations for any outriggers used.

Mike McCann
MMC Engineering

 

[racookpe1978]

Yes - (For cranes) but if the OP is looking at a "bridge" or roadway, then what would be relevant is the "moving load" (wheel load) of a crane when it drives across the "bridge" right?

Unless the OP is going to place the crane on the bridge, then lower the 4x supports and jack up the crane off of the rolling wheels. That seems unlikely - but all you'd have to do is "rate" teh bridge for driving, and not lifting. Need a sign restricting crane placement on the bridge up as a CYA for the next twenty years though. 8<(

 

[msquared48]

Ladder truck with outriggers is a design consideration too, bridge or not.

Mike McCann
MMC Engineering

 

[csd72]

racookpe,

you are making a lot of assumptions there on the reasons for the information.

Cranes do sometimes get sited on bridges for lifts. I just managed one a fortnight ago.

Enlightenme,

The method that I gave you is conservative for all mobile crane types and loads except crawler cranes. The idea is that you are taking the upper bound when the boom is over a corner outrigger and the crane is at its tipping point balanced on that one outrigger, thus you have both the load and the crane weight bearing on this one outrigger.

If the crane is fully loaded and the load is swung 360 degrees then the actual load will be the same, if the crane is not fully loaded then it will be less.

 

[rb1957]

intersting, i thought the OP was designing tires.

maybe the OP should chime in on what he's doing, and why he wants the info ??