Plain Concrete Design
Plain Concrete Design
(OP)
I haven't any codes for plain concrete for slabs on grade.
Can anybody tell me shear and bearing stress requirements
Can anybody tell me shear and bearing stress requirements
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Plain Concrete Design
What are your loads? What will the slab be used for? Some refs to get you started:
1. ACI committee 360- Design of slabs on grade. This publication discusses five different design methods for slabs and gives a few worked examples. Methods include those espoused by CRSI and PCA in other publications available to the public. (Engineering data report #33 for CRSI and PCA Concrete Floors on ground, 2nd ed.)
2. Army TM 5-809-12 "Concrete floor slabs on grade subjected to heavy loads". Some good typical details.
3. "Designing floor slabs on grade" by Ringo and Anderson (Hanley Wood is the publisher). Cited in othe recent posts here on the same topic. Lots of useful data.
4. Concrete International Magazine- About once a year they publish one of their monthly issues just on s.o.g. design and construction. Articels are on both design and construction of slabs.
Regards
RE: Plain Concrete Design
Basically, the joint spacing is the key.
RE: Plain Concrete Design
RE: Plain Concrete Design
RE: Plain Concrete Design
RE: Plain Concrete Design
RE: Plain Concrete Design
RE: Plain Concrete Design
RE: Plain Concrete Design
RE: Plain Concrete Design
RE: Plain Concrete Design
Slabs on grade may be designed with a variety of approaches, the most common being Westergaard's procedures or some variant thereof. Elastic layer analysis is also used and finite element/difference procedures may be used as well.
The PCA and AASHTO both use the Westergaard approach for pavement design, as this is the most common application of design whether it is a roadway pavement or a warehouse slab serving as a pavement with forklift or other traffic.
I use the Westergaard approach and elastic layer analysis (ELA). ELA is quick and easy and gives me a cross-check on the PCA or AASHTO methods.
When faced with high static contact stresses, such as point load of shelving legs or similar, then a shear or bending design approach is more applicable, usually with shear being the primary controlling factor. In this analysis, code requirements for max. shear and bending should be used.
The performance of slabs on grade depends on several primary factors, including: proper thickness design for the anticipated loads, proper durability design in the concrete mix design (usually a minimum of 4000 psi concrete is necessary for durability requirements in pavement slabs or warehouse slabs subjected to traffic), proper placement techniques and thickness control, and proper joint design and placement.