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Title: High energy x-ray radiography and computed tomography of bridge pins

Abstract

Bridge pins were used in the hanger assemblies for some multi-span steel bridges built prior to the 1980's, and are sometimes considered fracture critical elements of a bridge. During a test on a bridge conducted by the Federal Highway Administration (FHWA), ultrasonic field inspection results indicated that at least two pins contained cracks. Several pins were removed and selected for further examination. This provided an excellent opportunity to learn more about these pins and the application of x-ray systems at Lawrence Livermore National Laboratory (LLNL), as well as to learn more about the application of different detectors recently obtained by LLNL. Digital radiographs and computed tomography (CT) were used to characterize the bridge pins, using a LINAC x-ray source with a 9-MV bremsstrahlung spectrum. We will describe the performance of two different digital radiographic detectors. One is a detector system frequently used at LLNL consisting of a scintillator glass optically coupled to a CCD camera. The other detector is a new amorphous silicon detector recently acquired by LLNL.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
9105
Report Number(s):
UCRL-JC-132822; YN0100000
YN0100000; TRN: US0102747
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: The Second Japan-US Symposium on Advances in Nondestructive Testing, Oahu, HI (US), 06/21/1999--06/25/1999; Other Information: PBD: 1 May 1999
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 42 ENGINEERING; COMPUTERIZED TOMOGRAPHY; NONDESTRUCTIVE TESTING; ULTRASONIC TESTING; X-RAY RADIOGRAPHY; BRIDGES; FASTENERS; CRACKS

Citation Formats

Green, R E, Logan, C M, Martz, H E, Updike, E, and Waters, A M. High energy x-ray radiography and computed tomography of bridge pins. United States: N. p., 1999. Web.
Green, R E, Logan, C M, Martz, H E, Updike, E, & Waters, A M. High energy x-ray radiography and computed tomography of bridge pins. United States.
Green, R E, Logan, C M, Martz, H E, Updike, E, and Waters, A M. Sat . "High energy x-ray radiography and computed tomography of bridge pins". United States. https://www.osti.gov/servlets/purl/9105.
@article{osti_9105,
title = {High energy x-ray radiography and computed tomography of bridge pins},
author = {Green, R E and Logan, C M and Martz, H E and Updike, E and Waters, A M},
abstractNote = {Bridge pins were used in the hanger assemblies for some multi-span steel bridges built prior to the 1980's, and are sometimes considered fracture critical elements of a bridge. During a test on a bridge conducted by the Federal Highway Administration (FHWA), ultrasonic field inspection results indicated that at least two pins contained cracks. Several pins were removed and selected for further examination. This provided an excellent opportunity to learn more about these pins and the application of x-ray systems at Lawrence Livermore National Laboratory (LLNL), as well as to learn more about the application of different detectors recently obtained by LLNL. Digital radiographs and computed tomography (CT) were used to characterize the bridge pins, using a LINAC x-ray source with a 9-MV bremsstrahlung spectrum. We will describe the performance of two different digital radiographic detectors. One is a detector system frequently used at LLNL consisting of a scintillator glass optically coupled to a CCD camera. The other detector is a new amorphous silicon detector recently acquired by LLNL.},
doi = {},
url = {https://www.osti.gov/biblio/9105}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {5}
}

Conference:
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