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REPORT NO. 33 TO THE Federal Housing Administration Criteria for Selection anct Design of Residential STabs-on-Ground PREPARED BY A SPECIAL ADVISORY COMMITTEE OF THE Building Research Advisory Board DIVISION OF ENGINEERING NATIONAL RESEARCH COUNCIL Publication 1571 NATIONAL ACADEMY OF SCIENCES / WASHINGTON, D.C. / 1968

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The National Academy of Sciences was granted permission to publish this report by the Federal Housing Administration This report has been prepared under FHA Contract No. HA ( - ) fll-743, and may not be reprinted or quoted extensively without the permission of the Federal Housing Administration and the National Academy of Sciences. This permission is not required for agencies within the United States Government. Available through the Printing and Publishing Office National Academy of Sciences Washington, D.C. Inquiries concerning this Publication should be addressed to: The Executive Director, Building Research Advisory Board, National Academy of Sciences-National Research Council 2101 Constitution Avenue, N.W., Washington, D.C. 20418 Library of Congress Catalog Card Number 67-62924

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Special Advisory Committee JOHN P. GNAEDINGER, Chairman; President, Soil Testing Services, Inc. Chicago, Illinois RAYMOND F. DAWSON, Associate Director, Bureau of Engineering Re- search, University of Texas, Austin, Texas RUDARD A. JONES, Director, Small Homes Council, University of Illinois, Urbana, Illinois SAMUEL JUDD, Chief, Structural Engineering & Architectural Branch, U.S. Bureau of Reclamation, Department of Interior, Denver, Colorado (Retired) CHESTER P. SIESS, Professor of Civil Engineering, University of Illinois, Urbana, Illinois HERBERT C. S. THOM, Chief Climatologist, Office of Climatology, U.S. Weather Bureau, Washington, D.C. BRAB Professional Staff MICHAEL C. SOTERIADES, Staff Consultant ROBERT M. DILLON, Executive Director S. W. LIPSMAN, Editorial Consultant FHA Technical Liaison Liaison from the Federal Housing Administration was provided by the following: FRANCIS M. CROMPTON, Acting Chief, Studies and Experimental Housing Section ELVIN F. HENRY, Soils Engineer, Office of Technical Standards JAMES A. MCCULLOUGH, Chief, Engineering Section, Architectural Standards Division, Office of Technical Standards JOHN T. DRESSEL, Structural Engineer, Office of Tecbuical Standards ARTHUR M. SNIDER, Structural Engineer, Office of Technical Standards .

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FOREWORD This report was prepared by a Special Advisory Committee of the Building Research Advisory Board of the Division of Engineering of the National Research Council. It has been reviewed, accepted, and approved for transmittal to the Federal Housing Administration by a Review Subcommittee of the Board, acting on behalf of the Board. In so doing, and with the concurrence of the Special Advisory Committee Chairman, the Board recommends to FHA that, in fur- therance of the aims of this report, it consider the development and publication of perhaps ten or more standard designs for what the report describes as Type III slabs. Although this report pro- vides adequate guides to design of these slabs (for expansive and compressible soils) and tables to expedite such design, this addi- tional simplification could prove of great value to the man in the field-i.e., he would have available to him the choice of electing to use a standard design which will in all respects meet or exceed his requirements, or of using the recommended design procedures which, although superior in the sense of permitting a design of greater cost effectiveness, would entail greater effort on his part. The Board is pleased to acknowledge the work of the Committee in developing this extensive report. It also acknowledges the assis- tance given the Committee by the professional staff members of the Federal Housing Administration who provided valuable technical liaison, and all those who gave assistance to the Committee through either correspondence or personal contact, in particular, the pro- fessional staffs of the Portland Cement Association and the National Association of Home Builders. ROBINSON NEWCOMB, Chairman Building Research Advisory Board

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