Acoustic Emission Monitoring of North East Trunnion Shaft on Oregon DOT Bridge 1377A I-5 over the Columbia River, Portland, Oregon

Oregon Department of Transportation (Oregon DOT) Bridge 1377A carries I-5 traffic over the Columbia River between Portland, Oregon and Vancouver, Washington. Field ultrasonic tests (UTs) performed in 1987, 1993, and 1996 by Oregon DOT indicated the presence of a crack indication in the vicinity of the shoulder at the outboard end of the north east trunnion shaft. The presence of roller bearings makes access to the shaft surface impossible without major costly disassembly thus precluding direct examination of the area containing the UT indication. The high cyclic loads and questionable material properties in conjunction with the UT indications led Oregon DOT to consider the use of acoustic emission (AE) to aid in their understanding of the trunnion shaft condition. In October of 1994 Basic Industrial Research Laboratory (BIRL) engineers under the sponsorship of Northwestern University's Infrastructure Technology Institute (ITI) conducted acoustic emission tests on all four of the east bridge trunnion shafts. These tests detected acoustic emission signals indicative of crack related activity in the vicinity of the outboard shoulder on the north east shaft (same area as UT indication). No similar activity was detected on any of the other shafts in the shoulder areas. At Oregon DOT's request BIRL engineers re-tested the north east shaft in March of 1996. The purpose of this re-test was to gain additional confidence in the previous findings.

  • Record URL:
  • Corporate Authors:

    Northwestern University, Evanston

    Basic Industrial Research Laboratory, 1801 Maple Street
    Evanston, IL  United States  60201-3135
  • Authors:
    • Prine, David W
    • Oleksy, Jerome E
  • Publication Date: 1996-5


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 5p

Subject/Index Terms

Filing Info

  • Accession Number: 01738944
  • Record Type: Publication
  • Files: NTL, TRIS
  • Created Date: May 8 2020 3:57PM