Design Slab On Grade CRSI 2

[Joe117]

I've been trying to find the old CRSI book that has the thickness recommendations for certain loads. Been looking through old posts and have found:

This is from an older version of the CRSI manual.
sub-slabs under other slabs - 2"
Domestic or light commercial <100psf - 4"
Commercial/institutional/barns (100-200psf) - 5"
Industrial/gas stations/garages (<500psf) - 6"
Industrial (600-800 psf) - 7"
Industrial (1500) - 8"
Industrial (2500) - 9"
Industrial (3000-3500) - 10"

with the following reinf:

2" - none
4" - one layer WWF 6x6-W1.4xW1.4
5" - one layer WWF 6x6-W2.1xW2.1
6" - one layer WWF 6x6-W2.9xW2.9
7" - two layers WWF 6x6-W2.9xW2.9
8" - two mats of #4@12"o.c. ea. way (top and bottom)
9" - two mats of #5@12"o.c. ea. way (top and bottom)
10" - two mats of #5@ 8 to 12" o.c. ea. way (top and bottom)

Bought the CRSI Handbooks from 1954 and 1984 and haven't had any luck finding it.

 

[driftLimiter]

There is a reason they publish these loads like this anymore. Several threads recently have discussed, the SOG capacity is primarily a function of the foundation preparation and bearing capacity. granted, a properly proportioned and reinforced concrete section is also required. I think (nowadays) there would be concern saying a 10" slab can carry 3000 psf without any reference to the base preparation and bearing capacity of soil.

I'm curious why you are seeking these tables. I think they would be useful for planning and budgets, but a good geotech report and structural design should be carried out especially for heavily loaded slabs.

 

[jimstructures]

Joe117

I don't know this is the exact table you are looking for, but a table for that information is contained in the following volume: CRSI, Design Handbook, Working Stress Design, Revised 1963 ACI Code, page 14-11. Most of the caveats raised previously are included in the notes accompanying the table.

Jim

 

[Joe117]

Thank y'all. and yup, old books for concepts/rules of thumb. New books for math/design.

 

[dik]

I don't recall what happened with it, but a couple of decades back, I did an airport runway in India... the soil was so poor and aggregates were unavailable, the slab was 18" thick... for heavy moving point loads... so depends a lot on the soil and the type of loading. A uniform load on a SOG constructed on great soil does not generate much flexure.


So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[Lutfi]

@Joe117 I have exactly what you are looking for. Attached image is for you and the rest. I have used this table successfully for many years.

It is old CRSI Design Handbook that tis for 3750 psi concrete.

Enjoy it.

Regards,
Lutfi

 

[Lutfi]

photo of the cover of the CRSI Handbook is attached. My copy is well used. I had a client who has several buildings that were designed using the concrete joists based on this handbook.

I had to thank my wife who found it, years ago, in a garage sale. She bought for few bucks!

Regards,
Lutfi