Structural Design requirements for Semi-Trailers
Structural Design requirements for Semi-Trailers
(OP)
Does anyone here know of the applicable design resource regarding structural design for: Semi-Trailers?
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Structural Design requirements for Semi-Trailers
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RE: Structural Design requirements for Semi-Trailers
RE: Structural Design requirements for Semi-Trailers
I am looking for a printed standard that I can reference for safety factors, as well as loading combinations.
Thanks for the input.
RE: Structural Design requirements for Semi-Trailers
RE: Structural Design requirements for Semi-Trailers
Regards
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RE: Structural Design requirements for Semi-Trailers
And you are correct I am in the USA. I was able to find some interesting material for Canada, though.
RE: Structural Design requirements for Semi-Trailers
All those have different types of frames and most every type mentioned above has a frameless design.
I have not seen anything published although I have worked with several different trailer manufacturers and I know that they have their own in house propriatary designs. THe frameless tankers while slightly thicker in the tank wall than the frame types are still said by their designers to be lighter than the frame designs.
Some boxes use very little frame and use the box itself as part of the load carrying structure. YOu can watch those going down the highway and watch the stress wrinkles in the side walls every time the thing hits a bump.
Frameless end dumps are lighter, but much more suseptable to tipping over on uneven ground.
All designs have trade offs.
THe DOT regulates how you load the trailers, that is to say how the loads are transmitted to the ground and more importantly to bridges, but they don't care if the trailer is substantial enough to carry the load or not. There are bridge law formulas that give axle spacings and the like for brige law requirements.
My tip is to go to the Society of Automotive Engineers (SAE) website and see if they have any publications that look like what you are looking for.
Are you trying to reinvent the trailer? Why not just go to several trailer vendors and have them bid on your requirements and justify their designs to you?
rmw
RE: Structural Design requirements for Semi-Trailers
If you have done similar designs, are you just analyzing the frame system for a Safety factor of 3-5 (?). Or do you design the frame fro the actual loads and then run a stress analysis for fatigue, and then increase the connections as required (using engineering judgment)?
Thanks for the input RMW.
RE: Structural Design requirements for Semi-Trailers
This is not my area of expertise, but I think you already know and you are just looking for confirmation.
The methodology in your last post is what I would do in your situation.
Regards
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RE: Structural Design requirements for Semi-Trailers
- If you say relative to service loads then it is not really any different than your second option.
- if you are using steel then the "easy" answer is to limit our stress to half of yield.
-The devil is in the details with fatigue. Small changes can make a huge difference, and usually the more expensive way is better
90% of the time the biggest issue is that you really don't know the maximum service loads. You have to take an educated guess - and then people usually try to put a little cushion on top of that.
ISZ
RE: Structural Design requirements for Semi-Trailers
Ed Danzer
www.danzcoinc.com
www.dehyds.com
RE: Structural Design requirements for Semi-Trailers
RE: Structural Design requirements for Semi-Trailers
Here is a good place to see some contrasts;
http://www.beallcorp.com/products.html
rmw