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Trailer Design Criteria

Trailer Design Criteria

Trailer Design Criteria

I am load rating an industrial trailer (ie not on highway) for a client. Does anyone have any references or suggested design criteria for trailer design?  

I have modeled the frame in RISA and multiple vertical loading combinations to determine what loads push it to AISC 13th allowable. I think AISC generally gives a safety factor of 2/3 on yield so how much additional safety factor (or load factor) is needed to account for dynamic or impact loading?  

I have read this thread but still don't have something to hang my hat on. http://www.eng-tips.com/viewthread.cfm?qid=261920&page=7   

RE: Trailer Design Criteria

Not knowing the nature of the service, be sure to get a good grip on how many G's this trailer will be subject to.


RE: Trailer Design Criteria

If it is not on a highway, then the impact will be greater for undulations and larger potholes.  I would consider 1.5 to 2.0 for that.  

What is the useage of the trailer.  I have done residentialo trailer frames and they were highway, subjected to 30 psf live loads sitgting and the dead load plus impact moving.

If these trailers are hauling gravel or equipment offroad, then it's Dead + Live + impact on the total of the two.    

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

RE: Trailer Design Criteria

The trailer is used to hall metal sheets and rounds over concrete and asphalt floors and driveways at speeds less than 10 MPH.

Mike - When you say 1.5 to 2.0, do you mean reduce the AISC allowable load by 1.5 to 2.0? Would this then be an equivalent safety factor of 3 to 3.5?   


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