BEHAVIOR OF ELASTOMERIC BEARING PADS UNDER SIMULTANEOUS COMPRESSION AND SHEAR LOADS

A STUDY OF ELASTOMERIC BEARING PAD PERFORMANCE IS PRESENTED. THIS STUDY WAS CONDUCTED ON LABORATORY-SIZE PIECES, BUT UNDER CONDITIONS WHICH APPROACHED AS NEARLY AS FEASIBLE THE CYCLIC SHEAR CONDITIONS FOUND ON ACTUAL STRUCTURES RATHER THAN THE INITIAL SHEAR CONDITIONS OF CURRENTLY PUBLISHED INVESTIGATIONS. IT IS SHOWN THAT THE CURRENT DEFINITION OF SHEAR MODULUS IS NOT APPLICABLE TO ELASTOMERIC MATERIALS. A SIMPLE FORMULA IS DEVELOPED AND THE CONSTANTS DETERMINED BY WHICH A SATISFACTORILY CLOSE APPROXIMATION OF THE STRESS/STRAIN CURVE CAN BE RECONSTITUTED MATHEMATICALLY. THE PARAMETERS THAT AFFECT SUCH CURVES WERE FOUND TO BE TESTING RATE, DEGREE OF STRAIN, AND PREVIOUS DEFORMATION HISTORY OF THE SAMPLE. OTHER PARAMETERS, SUCH AS GRAIN DIRECTION AND SHAPE FACTORS OF LESS THAN UNITY, ARE SUSPECTED OF AFFECTING THESE CURVES, BUT PRESENT STUDY WAS NOT CONCLUSIVE. WITH A KNOWLEDGE OF THE EFFECTS OF THESE PARAMETERS AND A STRESS/ STRAIN CURVE ESTABLISHED BY A STANDARD PROCEDURE, IT IS POSSIBLE TO COMPUTE PIER SHEAR FORCES AS THE ENGINEERING PROBLEM DICTATES. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; References; Tables;
  • Pagination: pp 83-101
  • Monograph Title: Design - Bridges and Structures
  • Serial:

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Filing Info

  • Accession Number: 00207703
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Dec 12 1994 12:00AM