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DESIGN OF LOAD TRANSFER JOINTS IN CONCRETE PAVEMENTS

THE PURPOSE IS TO ESTABLISH A RATIONAL PROCEDURE OF DESIGN OF LOAD TRANSFER JOINTS IN CONCRETE PAVEMENTS. THE DATA OBTAINED AGREE FAVORABLY WITH MEASUREMENTS OF THESE VARIABLES IN ACTUAL PAVEMENTS. THEORIES AND METHODS OF DESIGN ADVANCED BY WESTERGAARD, FRIBERG, KUSHING AND OLDER, FREMONT AND DUSHING ARE REVIEWED IN ORDER TO PRESENT THE LIMITATIONS OF THOSE STUDIES. IN THE PRESENT STUDY THE THEORETICAL METHOD OF WESTERGAARD HAS BEEN EXTENDED AND ADAPTED, IT IS HOPED, IN A MORE THOROUGH WAY TO THE ACTUAL CONDITIONS OF JOINTS IN PAVEMENTS. THE ANALYSIS IS BASED ON TWO ELEMENTS, FIRST, THE THEORY OF SLABS UNDER THE ACTION OF A LOAD AT THE EDGE OR ON EXPERIMENTAL DEFLECTION AND STRESS CURVES OBTAINED FROM MEASUREMENTS ON FULL SIZE OR MODEL SLABS. AND, SECONDLY, THE ELASTIC BEHAVIOR OF INDIVIDUAL JOINT UNITS AS DETERMINED BY LABORATORY TESTS OR THEORETICAL CONSIDERATIONS. ON THE BASIS OF THIS KNOWLEDGE TWO CONTINUITY EQUATIONS ARE ESTABLISHED FOR EACH JOINT UNIT WHICH ARE SUFFICIENT TO DETERMINE THE SHEAR FORCE AND BENDING MOMENT FOR EVERY UNIT IN THE JOINT. A CASE IS CONSIDERED IN WHICH NINE UNITS ARE SYMMETRICALLY DISTRIBUTED WITH RESPECT TO THE LOAD AND THE LOAD PLACED OVER ONE OF THE UNITS. THIS PROBLEM REDUCES TO TEN EQUATIONS WITH TEN UNKNOWNS THE SOLUTION OF WHICH LEADS TO FIVE LINEAR EQUATIONS WITH FIVE UNKNOWNS. THESE LATTER EQUATIONS ARE EASILY SOLVED BY SEVERAL KNOWN METHODS OR BY METHODS ESPECIALLY DEVELOPED FOR THIS PURPOSE. THIS PROCEDURE IN THE SOLUTION OF THE MAJOR THESIS CAN BE USED FOR SEMI-INFINITE OR FINITE SLABS, OF ANY SHAPE, WITH ANY DISTRIBUTION OF JOINT UNITS AND WILL ALWAYS GIVE A DEFINITE ANSWER. IT IS POINTED OUT THAT CHARTS MAY BE PREPARED FOR PURPOSES OF PRACTICAL PAVEMENT DESIGN ON THE BASIS OF THE ANALYSIS DESCRIBED. SUCH CHARTS WOULD GIVE THE MAXIMUM PERMISSIBLE SPACING OF A GIVEN JOINT UNIT IN A GIVEN PAVEMENT FOR GIVEN SUBGRADE CONDITIONS. THIS SPACING BEING DETERMINED SO AS NOT TO EXCEED THE MAXIMUM ALLOWABLE: (1) SHEAR FORCE IN THE JOINT UNIT, (2) STRESS IN THE SLAB, (3) PRESSURE OF UNIT ON CONCRETE, (4) ANY OTHER STRESSES. IT IS BELIEVED BY THE AUTHORS THAT THE DESIGN PROCEDURE DESCRIBED IS PRACTICAL AND SIMPLE. /AUTHOR/

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  • Supplemental Notes:
    • Vol 20, pp 481-497, FIGS, TABS, REFS. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
  • Authors:
    • Kushing, J W
    • Fremont, W O
    • Sutherland, E C
  • Publication Date: 1941

Media Info

  • Media Type: Digital/other
  • Monograph Title: Proceedings of the Twentieth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 3-6, 1940
  • Serial:

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Filing Info

  • Accession Number: 00205889
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 27 1971 12:00AM