Library stack room LL 1

[WWTEng]

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.

 

[SLTA]

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.

 

[JedClampett]

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.

 

[DST148]

@WWTEng: Try thread507-312421. There is a link to Whole Building Design Guide which may help.

 

[WWTEng]

@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 4 Commentary.pdf

I have decided to use 180 psf LL as min.

 

[BAretired]

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

 

[steellion]

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

 

[WWTEng]

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!!

 

[BAretired]

WWT,

You don't want this situation to occur:

http://www.structuremag.org/article.aspx?articleID=1375

BA