Criteria for Selection and Design of Residential Slabs-on-Ground (1968) / Chapter Skim
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II Conclusions and Recommendations
II Conclusions and Recommendations
Pages 9-22
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From page 9... ...
To permit future refinement of the approach developed, the Committee recommends Hat FHA implement and/or encourage others to implement these research recommendations. As data are developed which can provide a valid basis for further revision, the Committee requests that opportunity be provided for appropriate revision of recommendations.
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From page 10... ...
Use of these procedures of course should be tempered throughout with engineering judgment and experience, and, again, nothing said here should be construed to imply that FHA should not consider innovations in either slab design or analytical procedures which may be offered as alternatives, as long as the basic principles stated herein are satisfied. 1 .0 SLAB SELEC TION AND/OR DESIGN PROC EDUR E 1.1 Selection of Slab Type Step 1-Conduct a soil investigation of the building site to determine: a.
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From page 11... ...
for the area within which the building site is located. Step 3-Determine, from Table I, below, the slab type recommended for each soil type on the building site, i.e., Type I, II, III, or IV.
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Step 5-Provide weakened plane joints at the junction of irregular shapes to divide the slab into squares or rectangles with maximum dimensions not greater than 32 feet. Step 6-Determine whether the top surface of the slab will contain irregularities in its horizontal plane.
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Type II slabs cannot accommodate partition loads over 500 plf without additional reinforcement. If partition loads are 1Appendix C, Reference 1 (or later edition, if any)
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1.4 Procedure When Type III Is Recommended Investigate the possibility of removing the soil (to a depth of at least 15 feet) which requires the use of a Type III slab and replacing it with a soil of better consistency so that a slab of Type II or Type I can be used.
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, equate C to the reduced support index (Cr) as determined in pare.
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From page 16... ...
Beams should be spaced equidistant along each slab side, not to exceed a 15-foot clear spacing, and, preferably, a spacing between 9 and 12 feet. However, corresponding beams of overlapping rectangles of irregularly shaped slabs should coincide, even though some variation in spacing may result.
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Step 8-Select basic dimension. In cases where L/L' exceeds 2, beams along the short dimension can be designed with smaller depth than in the long dimension, provided there are definite cost or construction advantages and design computations have been adjusted properly.
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From page 18... ...
If, in the case of irregular slabs, the beams within a particular rectangular slab are not equidistant, adjust the steel computed as above to the unequal spacing of beams. Accomplish this by computing me average beam spacing; then increase the steel in beams spaced at a larger distance by an amount equal to the ratio of the
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From page 19... ...
In any case, this reduced top slab reinforcement should not be less than the WWF reinforcement specified for Type II slabs in Step 1 of pare.
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128. 1.5 Procedure When Type IV Is Recommended If a slab of Type IV is recommended, the ACI Building Code Requirements should be used for all Reinforced Concrete design associated with this construction.
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The criteria of 1.0 above provide for proper slab application on unstable soils consistent with present knowledge. 5.0 SLABS OF UNUSUAL CONFIGURATION It is not possible to evolve simplified slab design methods such as are presented herein, which will permit resolution of all problems which might be encountered in residential construction.
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From page 22... ...
Also, where a planned carport will constitute an actual extension of the residence, the carport slab should either be considered to be integral with the house slab and the total slab designed, or be designed and constructed as an independent slab with proper construction joints to permit movement between the two slabs and superstructures at all points of juncture. If an unbroken roof line is desired, the former solution would add significantly to cost, whereas the latter would be virtually impossible to achieve.
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