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Basepad Support Failure

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Packermanfan

Packermanfan

Mechanical
Jan 4, 2024
7
Hi all, I'm hoping someone can explain what seems like a simple mechanical failure question, but one that has kept me curious for awhile.

I have a pic attached showing an adjustable carbon steel basepad, capable of holding 800+ lbs. My question is, if additional weight was added until failure, where would the failure occur? Would the threads shear off with the nuts? Would the 3/8" weld on the bolt to pad fail and fall to the floor? Threads and nuts on a mechanical level can get complicated, so I'm not even sure if the weight is focused on the bottom nut, top nut, or both when tightened.

Any help to satiate my curiosity is appreciated.
 
 https://files.engineering.com/getfile.aspx?folder=b67fd4ee-6077-4c6e-8e88-3eae8726cf76&file=2024-03-14_11_28_41-10000637308_(Active)_c__users_usstorkr_appdata_roaming_sap_ectr_filespace_prd300.png
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I don't see the whole picture from what you post but I would think that the baseplate itself will begin to bend in permanent strain distorting the structure before anything related to the bolts would fail.
 
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I say that is because the mode of failure of the bolts would be in compression or column failure and I would think that any one bolt would be able to take 1000 + pounds each. Also one 3/8" weld around the circumference of a bolt could also take 1000 + pounds each in compression. Note that the bolts are in compression only as long as the plate does not deflect significantly. If the plate deflects significantly a moment will be put on the bolts and the bolts will then deflect with the plate since the bolts are very weak in bending. I assume what you have is a raised basepad with four bolts, one at each corner.

So the plate I believe is the weak point and will start bending when overloaded. Solution would be to install a thicker basepad on same elevated bolts.
 
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Please use the image tool to show pictures in line.

2024-03-14_11_28_41-10000637308__Active__c__users_usstorkr_appdata_roaming_sap_ectr_filespace_prd300_bavims.png
 
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