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Tool Talk Discussion Forum

Re: engineering question

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WFE2-70 NWIA

01-07-2013 18:32:03
74.44.35.228



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They are built with tubing the tall way, so it would have to bend across the 2" way. I can put a truss rod or strap under them to stiffen them up if necessary. If I did this how far away would you suggest I put the truss from the center of the ramp? I know the farther away I put it the stronger it will be. Thanks.




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Indiana Ken

01-08-2013 19:05:53
66.249.232.131



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 Re: engineering question in reply to WFE2-70 NWIA, 01-07-2013 18:32:03  
I did some simple hand calculations using 30,000 psi as an allowable yield stress. Since we don't really know what the material is, I assumed a non-structural 1010 steel. Also, we cannot be assured the vehicle will be centered on the ramps so I placed all the wheel weight on one of the 1" x 2" x .1046" wall tube members. The maximum stress occurs when the wheel is half way up the ramp. The yield stress level of 30,000 psi is reached at a wheel weight of approximately 500 lbs. That would mean the front of the vehicle could weight a maximum 1000 lbs, (500 lbs per wheel).

This is not to say the ramps will fail if the front of the vehicle weights more than 1000 lbs but rather to say the ramps are better suited for lighter vehicles.

To your question of reinforcing the ramps by placing a bridge under the tube on each side: If a 6" bridge is used and we assume a wheel weight of 1500 lbs, the tensile load in the supporting tie bar would be approximately 4,560 lbs. A 1" x 3/16" thick tie strap could be used with three bridges; one in the middle of the 6' tube (6" long) and one centered on each side of center, i.e. 18" from each end, (3" long).
I would very much recommend that you not reinforce these ramps since 4560 lbs is a high load to join with thin wall tubing. It would be best to start with ramps better suited for full sized vehicles.

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jon f mn

01-07-2013 19:30:31
70.194.130.71



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 Re: engineering question in reply to WFE2-70 NWIA, 01-07-2013 18:32:03  
6 foot is a long ramp. As a general rule you can figure it takes double the strength for each foot of length. So a 5'has to be twice as strong as a 4' and a 6' has to be twice as strong as a 5'. So, if you can cut off a foot or so that would help. But if not you could take a flat and bridge it. I would go at least 4" or more for 6'. Once you put a bridge under it the bridge will be doing most of the work, so make sure it's strong enough.

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