Details:

Alternative Title:
Acoustic Emission and Strain Gage Monitoring of Widow Structure B-5-158, Tower Drive Tied Arch, Green Bay, Wisconsin
Creators:
Prine, David W.
Corporate Creators:
Northwestern University (Evanston, Ill.). Basic Industrial Research Laboratory
Subject/TRT Terms:
[+]
Acoustic Emission Tests Bridges Brown County, Wisconsin Cracks Green Bay I-43 Inspection Strain Gages Welds
Publication/ Report Number:
ITI Technical Report No. 1
Resource Type:
Tech Report
Geographical Coverage:
Wisconsin
Corporate Publisher:
Northwestern University (Evanston, Ill.). Infrastructure Technology Institute
NTL Classification:
NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures
Abstract:
The in-depth inspection by WIDOT detected two sites that had visible cracks in the stiffener-to-hanger diaphragm welds, the east side of Hanger 6 in the north tie girder, and the east side of Hanger 4 in the south tie girder. Additionally, many ultrasonic indications were detected by WIDOT in the web-to-stiffener welds. On May 3, 1993 BIRL commenced testing. Test sites included Hangers 4 and 6 on both the north and south tie girders. A total of six sites were monitored (the west side of Hanger 4 on the north girder, the east side of Hanger 6 on the south girder, and the east and west sides of Hanger 6 on the north and Hanger 4 on the south girder). These sites included all of the known cracks, sites that were adjacent to known cracks but with no known cracks, and sites that had no known cracks present either in or adjacent to the test site. The acoustic emission setup monitored both the stiffener-to-diaphragm and stiffener-to-web welds at each test site. Two strain gages were monitored at each of the test sites. Testing continued through May 13, 1993. Traffic loading during the tests included many large obviously heavy loads. A wide range of environmental conditions were encountered, including high gusty winds and temperatures ranging from 37 degrees F to 80 degrees F. Test results showed no detectable crack-related activity from any of the six test sites and very small live loads (30 to 50 pin./in. strain) from the strain gage tests. These test results imply that some mechanism other than fatigue is responsible for the visible cracks.
Format:
PDF
Collection(s):
US Transportation Collection ITSJPO Digital Library
Main Document Checksum:
[+]
urn:sha256:df9eb2e3e47a205c4670a855c598a9480db49dc5af8f804bb60977565fda7693
Download URL:
https://rosap.ntl.bts.gov/view/dot/35189/dot_35189_DS1.pdf
File Type:

Supporting Files

• No Additional Files

More +