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/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1965/76/76-003.pdf
• Supplemental Notes:
  • 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:
  • Nachtrab, William B
  • Davidson, Robert L
• Publication Date: 1965

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; References; Tables;
• Pagination: pp 83-101
• Monograph Title: Design - Bridges and Structures
• Serial:
  • Highway Research Record
  • Issue Number: 76
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Bearings; Calculation; Compression; Deformation; Deformation curve; Development; Elastomers; Formulas; Laboratory tests; Mathematical analysis; Piers (Supports); Piers (Wharves); Rates; Shear strength; Shear stress; Strain (Mechanics); Testing
• Uncontrolled Terms: Computation; Shear forces; Strain rate
• Old TRIS Terms: Bearing pads
• Subject Areas: Bridges and other structures; Highways;

Filing Info

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