NEOPRENE BRIDGE BEARING PADS UNDER COMPRESSION AND REPEATED SHEAR

BRIDGE BEARING PADS OF PLAIN CUT NEOPRENE AS WELL AS SOME WITH STEEL LAMINATIONS, WERE SUBJECTED TO SHEARING LOADS WHILE UNDER A CONSTANT VERTICAL COMPRESSION. THE SHEARING LOADS WERE ALTERNATING AND REPETITIVE, FOR DEFLECTIONS UP TO PLUS OR MINUS 50 PERCENT OF THE UNCOMPRESSED PAD THICKNESS. SOME TESTS WERE MADE WITH THE SHEARING LOAD IN ONLY ONE DIRECTION FOR DEFLECTIONS UP TO 95 PRECENT OF THE UNCOMPRESSED PAD THICKNESS. CHAFING AND RAVELING OF THE LOADED SURFACES WAS OBSERVED, IN ONE TEST, AFTER ONLY TWO HUNDRED CYCLES OF ALTERNATING SHEARING LOAD. TEARING OCCURED IN SOME SPECIMENS FOR WHICH THE SHEARING LOAD WAS ALTERNATED AT THE FAST RATE OF ONE-HUNDRED LOAD CYCLES PER MINUTE. ONE LAMINATED SPECIMEN SUBJECTED TO REPEATED SHEAR DEVELOPED SOME SEPERATION OF NEOPRENE AND THE METAL LAMINATIONS. ONE LAMINATED SPECIMEN SUBJECTED TO AN 85 PERCENT DEFLECTION WITH A 750 PSI VERTICAL COMPRESSIVE LOAD, DEVELOPED PERMANENT FLEXURAL DEFORMATIONS OF THE LAMINATIONS. /AUTHOR/

• Corporate Authors:

  Pennsylvania State University, University Park

  Pennsylvania Transportation Institute, Transportation Research Building
  University Park, PA  United States  16802
• Authors:
  • Brielmaier, A A
  • Hoblitzell, J R
• Publication Date: 1967-2

Subject/Index Terms

• TRT Terms: Bridge bearing pads; Compression; Deflection; Flexural strength; Laminates; Loads; Neoprene; Shear strength; Stripping (Pavements); Tearing; Thickness
• Uncontrolled Terms: Change
• Old TRIS Terms: Repetitions
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00208312
• Record Type: Publication
• Report/Paper Numbers: 96pp
• Files: TRIS
• Created Date: Jul 21 1994 12:00AM