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Library stack room LL

Library stack room LL

Library stack room LL

(OP)
From ASCE 7-05 it appears that stack rooms have to be designed for a min LL of 150 psf. Is that all I need to use or should I be superimposing some other loads (partitions etc). 150 psf seems sort of light, so I wanted to make sure I get it right.

Thanks.

RE: Library stack room LL

There are a bunch of requirements for 150 psf - do you know the stack layout yet?  Don't forget there's also the 1000 lbs concentrated load.  If in doubt, try going for Heavy Storage at 250 psf.

RE: Library stack room LL

ASCE give miminum loads. If you feel that it is light, by all means increase it.
I think that their number takes into account the spaces between the shelves, but why lose any sleep over it? Make it 200 or 250 psf.  

RE: Library stack room LL

(OP)
@slta: Yes, I have the layout and its a typical stack 90" high by 1' deep (wide). Rows are going to be separated by 42" minimum.

JC, DST: thanks for the input. Looking at the link you posted, running some numbers based on 48 pcf paper density and also reading at this article I found via google: http://www.ce.udel.edu/courses/CIEG407/CIEG_407_Protected/Chapter%204%20Commentary.pdf

I have decided to use 180 psf LL as min.

RE: Library stack room LL

You might also want to give a little thought to stabilizing the stacks against overturning, particularly if they are in a seismically active zone.  One stack tipping over can start a domino effect.

BA

RE: Library stack room LL

Stacks of books are really heavy, I would recommend 250 PSF unreducible live load.

RE: Library stack room LL

(OP)
BA, we are in low seismic area, seismic design cat B per IBC 09. But its an interesting thought, how to stabilize against racking. I guess you would have to tie the stacks to the floor and each other!!
 

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