NEOPRENE BEARING PADS UNDER REPEATED COMPRESSION AND SHEAR

THE STUDY OF NEOPRENE BEARING PADS AT THREE TEMPERATURES (PRIMARILY 0 F) AND UNDER THREE LOADING CONDITIONS WAS SPONSORED BY THE PENNSYLVANIA DEPARTMENT OF HIGHWAYS AND THE BUREAU OF PUBLIC ROADS. MOST OF THE PADS WERE OF 60 DUROMETER HARDNESS, PLAIN CUT, AND SOME WERE LAMINATED, CONTAINING TWO STEEL SHIMS. THE LOADING CONDITIONS WERE (1) REPEATED COMPRESSION OVER A RANGE CORRESPONDING TO DEAD AND MAXIMUM LOAD, WITH SOME TESTS TO 2 MILLION LOAD CYCLES, (2) REPEATED ALTERNATING SHEAR UNDER CONSTANT VERTICAL COMPRESSION, USUALLY TO 1500 LOAD CYCLES, AND TO PLUS-MUNUS 50 PERCENT SHEARING DEFLECTION, AND (3) NONREPETITIVE, UNIDIRECTIONAL SHEAR WITH CONSTANT VERTICAL COMPRESSION TO A MAXIMUM SHEARING DEFLECTION OF 90 PERCENT. SURFACE ABRASION OCCURRED IN ALL REPEATED SHEAR TESTS, AND RAVELING OCCURRED IN THOSE AT 0 F. REPEATED LOADING IN ALL TESTS AT 0 F RESULTED IN DEFORMATION OF PADS AND MARKED INCREASE IN PAD STIFFNESS. THE DEFORMATION RAPIDLY VANISHED AFTER THAWING OF THE PADS. SOME SEPARATION OF NEOPRENE AND STEEL SHIMS AND BENDING OF THE SHIMS WERE OBSERVED IN THE 0 F TESTS. INCREASED VERTICAL LOADS RESULTED IN INCREASE IN SHEARING RESISTANCE AT 0 F BUT APPEARED TO HAVE NO EFFECT AT 120 F. /AUTHOR/

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/hrr/1968/253/253-006.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Bridge Design. 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:
  • Brielmaier, A A
  • Hoblitzell, J R
• Publication Date: 1968

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 97-104
• Monograph Title: Bridges
• Serial:
  • Highway Research Record
  • Issue Number: 253
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Abrasions; Accelerated tests; Compression tests; Deflection; Deformation; Hardness; Laminates; Load tests; Loads; Neoprene; Repeated loads; Shear strength; Shear tests; Stiffness
• Uncontrolled Terms: Vertical loads
• Old TRIS Terms: Bearing pads; Compressive strength tests
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208913
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jan 23 1994 12:00AM