TESTS ON FIVE ELASTOMERIC BRIDGE BEARING MATERIALS

SOLID, BONDED, AND LAMINATED ELASTOMERIC BEARING PADS MADE OF NEOPRENE, BUTYL, HYPALON, EPT, AND CHLOROBUTYL WITH SHAPE FACTORS RANGING FROM ONE TO SIX WERE SUBJECTED TO A SERIES OF THREE SPECIFIC TESTS TO DETERMINE THEIR RESPECTIVE LOAD- DEFORMATION CHARACTERISTICS. COMPRESSION-DEFLECTION TESTS WERE CONDUCTED TO DETERMINE SHORT-TIME LOAD-DEFLECTION RESPONSES FOR SOLID BONDED AND LAMINATED PADS PLACED BETWEEN BEARING SURFACES OF CONCRETE-AND-CONCRETE, CONCRETE-AND- STEEL, AND STEEL-AND-STEEL. ADDITIONAL VERTICAL DEFLECTIONS DUE TO STATIC CREEP IN THE PAD MATERIALS (LOADED IN COMPRESSION) WERE MEASURED OVER PERIODS RANGING FROM ONE TO THREE WEEKS. INVESTIGATIONS WERE MADE TO DETERMINE THE EFFECTS OF REPETITIVE REVERSED HORIZONTAL SHEAR FORCES ACTING ON BEARING PADS LOADED BY CONSTANT VERTICAL COMPRESSIVE FORCE. NEOPRENE, BUTYL, EPT, AND CHLOROBUTYL ARE RECOMMENDED FOR USE AS BRIDGE BEARING PADS. THE ONLY MATERIAL REJECTED (HYPALON) AS A RESULT OF THE TESTS ALSO FAILED TO MEET AASHO MATERIALS SPECIFICATIONS. BONDED AND LAMINATED PADS ARE RECOMMENDED WHERE ECONOMICALLY PRACTICABLE. THE EFFECT OF CONTACT SURFACE TYPE, IN WHICH FRICTION PROVIDED THE RESTRAINT, APPEARED TO BE INSIGNIFICANT FOR NORMAL SURFACE CONDITIONS EXCEPT IN THE CASE OF SHORT-TIME DEFLECTIONS. FURTHER SUGGESTIONS INCLUDE THE NEED OF ALLOWANCE FOR STATIC AND DYNAMIC CREEP. /AUTHOR/

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrr/1968/253/253-004.pdf
• Supplemental Notes:
  • Paper sponsored by Committee on Bridge Design and presented at the 47th Annual Meeting. 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:
  • Aldridge, Welton W
  • Sestak Jr, Joe J
  • Fears, Fulton K
• Publication Date: 1968

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 72-83
• Monograph Title: Bridges
• Serial:
  • Highway Research Record
  • Issue Number: 253
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Bearing tests; Bonds; Bridge bearing pads; Compression tests; Deflection tests; Deformation; Elastomers; Laminates; Loads; Neoprene; Rubber; Testing
• Uncontrolled Terms: Contact area
• Old TRIS Terms: Butyl rubber; Compressive strength tests
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208911
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Jan 23 1994 12:00AM