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Center of Gravity & Sling Loadings
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- Subject: Center of Gravity & Sling Loadings
- From: Jeremy Kuhn <jkuhn(--nospam--at)americancrane.com>
- Date: Mon, 12 Aug 2002 08:18:02 -0400
I have a trolley which I need to lift which has 4 lifting lugs on it...I have determined the C.G. of the load and now I am in the process of determining the different vertical load which each lug sees due to its proximity to the C.G. and then I will determine the tension in the slings by trigonometry. Here is the question...I have come up with 2 different methods of determining the vertical loads on each lug - both seem to be logical...but results are very different ! Is there a correct way to determine vertical loads at 4 different locations which are at unequal distances from the C.G. ? I looked through all the Riggers Handbooks in the office and came up empty. The first method I used (working in an XZ plane) was to divide the problem into 2...two lugs had a distance of 30% of the length to the C.G. in the X direction - so I assumed those two lugs saw 70% of the load - then one of the lugs which saw 70% of the load had a distance of 40% of the length to the C.G. in the Z direction so it got 60% of the 70% (42% of entire load)...and so on for each of the other lugs.. The second method which I used was to take a straight line distance from each lug to the C.G. and then determine the vertical load seen by assuming that each vertical load would be inversely proportional to the distance from the C.G. - little tough to explain the exact process. Anyhow...any insight into an approved method would be appreciated ! Thanks ! ******* ****** ******* ******** ******* ******* ******* *** * Read list FAQ at: http://www.seaint.org/list_FAQ.asp * * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to: * * http://www.seaint.org/sealist1.asp * * Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. Make sure you visit our web * site at: http://www.seaint.org ******* ****** ****** ****** ******* ****** ****** ********
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