Industrial Building?

Question

Industrial Building?

SteelPE (Structural)

(OP)

22 Feb 18 17:04

I have a client who is asking me to put some preliminary plans together for an industrial facility. The building is pretty straight forward but has some interesting crane requirements. The building is to contain a very large bridge crane above a smaller set of bridge cranes. The larger bridge crane is of such a size to require an independent column system however (easy enough). I am a bit concerned about trying to bracket off these crane support columns to support the other smaller bridge crane system. I don’t see why it can’t be done, especially since the large bridge crane requires a system of bracing that will run parallel to the runway girders. Has anyone else run into a similar situation in the past?

This whole crane below another crane inside a building reminds me of a movie (I think it was called Inception).

dik (Structural) · Answer 1 · 2018-02-22 17:56:23

The smaller cranes have to be free standing and can be a bit of a hazard to the larger overhead bridge.

Dik

EngineeringEric (Structural) · Answer 2 · 2018-02-22 18:11:40

I have not done, but i have seen this. I believe the facility had to have instructions like not the use the small ones when using the big one as obviously they will cross paths and potentially double load the system. This facility made ships and rarely ever used the big one.

You may want to ask the owner how the systems will be used. if the big crane is running items for the full length will the lower beams get in the way?

SteelPE (Structural) · Answer 3 · 2018-02-22 18:38:57

Dik,

Why can't the smaller crane system be bracketed off the columns that support the larger crane. The only issue I see (which I think you can deal with) is in regards to the traction force on the smaller crane system. Sway forces would be distributed to the main building columns and main building LFRS, and the traction forces would be taken into the bracing system designed specifically for the larger crane.... The torsion generated by the traction force give me some pause though.

I like the idea, I don't think that is want the client is looking for though

EngineeringEric

I would think running both sets of cranes would definitely be a hazard even if the building could accommodate them running at the same time. Imagine if the two cranes ran into each other while picking loads (or the lower crane ran into the load of the larger. I imagine some sort of short would need to be programmed so you couldn't get them running together.

hokie66 (Structural) · Answer 4 · 2018-02-22 20:33:40

If the smaller crane is 15 tons or less, brackets should be acceptable. Otherwise, a stepped column might be the answer.

JStephen (Mechanical) · Answer 5 · 2018-02-22 21:22:14

Here's the Inception cranes: https://www.youtube.com/watch?v=gYpMz63WAjM

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