load factors on lifting
load factors on lifting
(OP)
Anyone knows load factors in lifting?
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load factors on lifting
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load factors on liftingload factors on lifting(OP)
Anyone knows load factors in lifting?
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RE: load factors on lifting
RE: load factors on lifting
RE: load factors on lifting
That's like "lifting" oneself--does that count?
RE: load factors on lifting
RE: load factors on lifting
Stuck inside doing a project however. I'm comically behind.
RE: load factors on lifting
<== can barely life my arms to type
RE: load factors on lifting
These fellows are having a bit of fun at your expense, but seriously, just make your question more specific and someone will probably be able to help you. As to 271828, if he didn't spend so much time on this site, maybe he wouldn't be so comically behind.
RE: load factors on lifting
nsjxs, I'd second hokie66 - It's Saturday and we're just relaxing a bit - just post more details about your question and I'm sure we'll all tackle it.
RE: load factors on lifting
The point is well taken, though.
My problem is one of over-commitment. I just can't say no. Dissertation proposal, then consulting work, then writing papers, conferences, committee work, etc. I actually said no to a really interesting project yesterday and was very proud of myself!
271828 comes from my little girl. Her name starts with E, so I called her "Little E" which morphed into e, which is of course the base of the natural log. I couldn't use a handle with a decimal point, hence the name.
RE: load factors on lifting
You're a daddy. Be sure to give little "e" a hug tonight and read her a story!
RE: load factors on lifting
RE: load factors on lifting
I got an answer from JStephen. Thanks.
RE: load factors on lifting
RE: load factors on lifting
JAE and 271828, it doesn't hurt to have some fun now and then, IMHO.
Regards,
-Mike
RE: load factors on lifting
just thinking about how factor of safety in lifting should be considered.
3 is usualy considered by most engineers and maybe this is because of the following:
-uncertainty of load would be a factor of 1.6
-dynamic factor of 1.25
-and a factor again of 1.5 which I think this includes material strength reduction
Im not certain of how the 3 is got but if someone got answers i'll be very thankful
sorry for my choice of words. its just that I'm not really good in english. And I'm also a young engineer so I havent got enough experience yet.
RE: load factors on lifting
It's been a long time since I read thru the AISC material on lifting beams so I can't really remember the reasoning behind their recommendations. My first job after my engineering degree was in a plant engineering department where one of my responsibilities was lifting devices. I started using the 1/3 factor simply because that was the way they did it. Later after doing more research I added the 1/5 factor of safety. I think the 1/5 is useful to prevent the use of materials not ductile enough to go into a gradual yielding when overloaded.
One cause of impact is the result of the lifting speed of hoists which can be determined using several of the crane specs. You could check the following site for either the CMAA#70 spec or the Monorail spec.
http://www.mhiastore.org/category.cfm?Category=16
-Mike
RE: load factors on lifting
1/2% for each foot/minute of the working load, not to be taken less than 15% or more than 50%.
Do a search for MH27.1-2003 which is the monorail spec.
RE: load factors on lifting
If you multiply the three factors you mentioned in your post of May 20, you get 3.
Regards,
Lcubed
RE: load factors on lifting
A shipyard gantry lifting 1000 ts or a crane in a marina to lift dinghies? I would recommend you to have a look in the Codes for lifting appliances used by Lloyd's or DNV or any other national design codes.