150 psf LL for library stacks
150 psf LL for library stacks
(OP)
Does this 150 psf include self weight of the stack or is it only for the contents of the stack? I always assumed that 150 was for the contents and stack self weight is separate.






RE: 150 psf LL for library stacks
Dik
RE: 150 psf LL for library stacks
RE: 150 psf LL for library stacks
Interesting that the ASCE7-05 live loads do not address the library rooms and the 2009 IBC gives a 90" (7.5') high and 3' walking space between (for a 5' oc spacing) as a requirement of their 150 psf live load.
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: 150 psf LL for library stacks
M.S. Structural Engineering
Licensed Structural Engineer and Licensed Professional Engineer (Illinois)
RE: 150 psf LL for library stacks
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: 150 psf LL for library stacks
Dik
RE: 150 psf LL for library stacks
On my last library project, I did some research and 150 psf turned out to be a little conservative actually although I used 170. The most common book type is Octavo (6"x9"). Paper density is 50 pcf for your average print paper (a little lower actually) but instead of octavo lets use quarto (12"x9.5"). Now for a 90"x12" stack the paper weight: 9.5" widex90" tall(conservative since books are hardly ever stacked full height)x50 pcf=300 psf. With 36" space between the stacks, the 150 psf live load works out just about. And I also included actual weight of the stack itself as DL.
RE: 150 psf LL for library stacks
Have you looked at the commentary to chapter 4 of ASCE 7-05? It contains information on library stack rooms including some of the the assumptions used to justify the 150psf loading. Concerning the weight of the stacks themselves,the commentary states: "Book stack weights also vary, but not by enough to significantly affect the overall loading."