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Very Long Supports for LCD screens

Very Long Supports for LCD screens

Very Long Supports for LCD screens

(OP)

Can someone tip me on what kind of horizontal loads should I consider if I want to design a very long (about 4.50 meters long) support to hang a LCD screen from a ceiling.. It's inside a building with wide open interior spaces..

RE: Very Long Supports for LCD screens

Horizontal load? Do you mean the reaction force? You need to solve for that using your geometry and basic mechanics.

Or do you mean earthquake loads? Again, solve directly using mechanics and your code.

RE: Very Long Supports for LCD screens

(OP)
thanks in advance for your reply..

not earthquake loads, no problem with that here..
i would call it an occasional wind load inside of buildings or something like that.. i use the eurocode, maybe i don't know the code that well, but i couldn't find anything there..

i'm looking for criteria to choose a diameter for a tubular section.. some horizontal force acting on the screen that causes bending moments on the tube.. do you know what i mean?

RE: Very Long Supports for LCD screens

I would use 5 psf minimum, 15 psf maximum

RE: Very Long Supports for LCD screens

I would use a bit larger wind load, say 20psf. you never know, he could end up hanging 5 more TV's of that thing. When in doubt, make it stout.

RE: Very Long Supports for LCD screens

I agree with ztengguy... However I would think the safe load to use would be 2kPa (~42psf). That's because what I would worry about inside is unbalanced mechanical system load, ie: The force you feel when opening doors between two HVAC controlled areas. Recorded instances approaching 2kPa have been recorded, so that's your worst case wind.

Reference:https://www.cmhc-schl.gc.ca/en/inpr/bude/himu/coed...

RE: Very Long Supports for LCD screens

(OP)
thank you for your comments.. they were of great help..

now i have a notion of the kind of loads to use.. i'll check that reference closely and finally decide on the load to consider..

RE: Very Long Supports for LCD screens

Can someone accidentally fall or lean against it?

RE: Very Long Supports for LCD screens

bolgerix,

Could somebody use it to do chin-ups? Are there fork lifts in the building?

If your structure fails, what or who will the TV land on?

--
JHG

RE: Very Long Supports for LCD screens

Drawoh: Every building code I know of precludes this by having a restriction on anything climbable (is that a word? *sigh*), a restriction against anything you can climb on being attached to the structure.

I've seen gross violations of this restriction, however it is not the designer's fault if someone uses a ladder or their buddy to reach the TV support. It is the designer's fault to allow something low enough to climb at all.

RE: Very Long Supports for LCD screens

How does the unbalanced mechanical load apply to this situation unless the TV is at the interface of the two spaces that have the pressure delta between them? With 42 PSF applied to everything inside a building I'll need to start designing hold downs for refrigerators.

Didn't codes in the past reference minimum internal lateral loads of 10 PSF? I'd probably start there while considering possible larger future screens and see how I liked the results.

RE: Very Long Supports for LCD screens

ASCE 7 is 10psf (never used that code; Learnt the tidbit here), and the NBCC requires 20psf. The Brits are worse still, but I can't remember the number off the top of my head.

Yes, 2kPa is absolute overkill, but why try to engineer this to the nines? This is not a fridge, and you don't want anything going wrong for the sake of a couple of hundred dollars (max).

We might not agree on this one, but I would *not* be sticking my neck out for a frigging TV stand.

RE: Very Long Supports for LCD screens

(OP)
it's in an airport.. and the screen will be standing 3.0m off the ground at the center of the baggage carousel.. so if the structure fails it will most probably land on the ground..

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