Criteria for Selection and Design of Residential Slabs-on-Ground (1968) / Chapter Skim
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I Introduction
I Introduction
Pages 1-8
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The original FHA request for advisory services under this contract dates from 27 February 1957 and called for the following: A determination of criteria for proper design and construction of heated and unheated slabs-on-ground to ensure structural soundness, including a. Maximum dimension in which any unreinforced slab-onground may be constructed to safely avoid harmful cracking of the slab due to shrinkage and temperature change, and amounts of reinforcement necessary for slabs of greater length b.
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The first two, this Introduction and the Conclusions and Recommendations of the Special Advisory Committee, constitute a complete report in which the problem is defined and the needed answers are supplied. The third section, comprising three parts, contains supporting information, i.e., the reasoning behind the recommendations of the Committee, together with pertinent data, analyses of the various factors affecting slab design, necessary deriviations of analytical approaches, and guides to use of the latter.
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This first revision of the 1962 final report incorporates further information developed through field study particularly in expansive soil areas, information developed by FHA and presented to the Committee, and new procedures for treating slabs on compressible soils.
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Included are the dimensions to which a heated or unheated slab may be constructed without reinforcement and yet avoid harmful cracking due to shrinkage and temperature change; the amounts of reinforcement required for slabs of greater length; the structural requirements of slabs which are to be placed on expansive or compressible soil; and, lastly, the research needed to fill remaining known gaps in knowledge concerning influences upon and means of achieving satisfactory residentialslab performance at the most reasonable price possible. 3.4 Study Limitations This report, and the recommendations contained herein, have been limited to providing assurance of satisfactory performance of slabson-ground to be used for the habitable portions of houses, and not for drives, garages or carports, basements, or other appurtenances.
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It also provides recommended design criteria and construction requirements for each type of slab as it relates to the type of superstructure construction involved. Analysis has shown mat four basic slab types will serve most functional needs, as well as needs imposed by the different soil and climatic conditions likely to be encountered.
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b. In instances where Type III slabs become necessary because of poor soil conditions or a climate which produces alternating periods of drought and excessive soil moisture, the successful performance of the slab depends equally on design and quality control.
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INTRODUCTION 7 Thus the designer, with the aid of this report-given the soil properties, climatic conditions, and superstructure constructioncan determine the type of slab appropriate for use, execute a reasonable design where necessary, and provide needed materials and construction specifications. Finally, nothing contained in this report should be construed to militate against the introduction or use of either existing or newly devised slab types or procedures.
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