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Overhead Crane Columns

Overhead Crane Columns

Overhead Crane Columns

(OP)
Wondering if there is any publicaitons or data on when to use seperate crane columns vs attaching crane runway beams to the main building frame columns. I have a 40' tall building with (2) 30 ton cranes with possible expansion. I would gladly do prelim. engineering work on this, however this isn't in our budget and would stray from preliminary plans that were presented.

RE: Overhead Crane Columns

I went through this with one of my projects about a month ago. I had a similar questions is this thread similar to the one that you asked:

http://www.eng-tips.com/viewthread.cfm?qid=340535

Now, you don't say whether or not you plan to attach to the existing columns using brackets, or if your are trying to fabricate a stepped column or if you are trying tor frame the system completely independent from the structure. I have never done a crane that large, I would definitely not use brackets, I would probably use a separate crane column.

Some good information can be found in AISC DG 7.

Hope this helps.

RE: Overhead Crane Columns

I believe the rule of thumb is use separate columns for 20 ton bridge cranes and larger, and use brackets for bridge cranes smaller than 20 tons.

DaveAtkins

RE: Overhead Crane Columns

With (2)cranes rated at 30 ton, ea and with more possible cranes< I would seriously consider columns. I worked in a heavy structural steel plant with over a dozen overhead cranes rated from 50 ton down to 30 ton and we had steel columns.

RE: Overhead Crane Columns

IMHO, if the OP has to ask this question he should not be taking the liability "to do preliminary engineering work". Yea, you have CISC and DG7 but I've found a lot of this crane column design is based on a lot of experience, especially when you start wracking your brain about tolerances and fatigue. The design time can get way out of hand if you've never done it before.

RE: Overhead Crane Columns

(OP)
I seen this requirement in CISC attachement.

3. Brackets should not be used to support crane beams with unfactored reaction greater than about 250kN.

Has anyone else seen this stated elsewhere. I would like to see it in a more specific tone.

RE: Overhead Crane Columns

Yes, it's the same requirement is DG 7.... but I believe that they get their information from CISC and reference it specifically. This is the same reference I made in my previous thread.

After the design of my last facility (a 15-ton crane with a 58 foot bridge), I would place my rule of thumb for bracketed crane columns at around 15-tons. Anything over 15-tons I would use a separate column system. This seems to fall in line with DaveAtkins. I have talked to others in the metal building industry and I have been told that they will frequently use stepped columns for large cranes. I have also visited a few fabricators, one of note had 2 5-ton cranes on the same line located on a separate column system braced back to the main building columns.

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