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Proceedings Paper

NDT of bridge pins on Pennsylvania Dept. of Transportation structures
Author(s): William J. Miller; M. K. Chaney
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Paper Abstract

The Pennsyulvania Department of Transportation conducted a two phase investigation of all fracture critical pin hanger assemblies between 1988 and 1991 of 23 bridges. The first phase consisted of visually inspecting and documenting the condition of the pin assemblies. The second phase involved nondestructive testing of the pins and any hanger assembly parts that the engineer requested. This testing was performed by consultant engineering firms under contract with individual Penn DOT Engineering Districts. The Mehoopany Bridge was the only structure which was tested exclusively by the department's personnel. Twenty fracture critical bridges were consequently retrofitted with support girders or rod support assemblies. The remaining three locations had the pin hanger assemblies removed and the structures were made continuous. Also, the pins were replaced at some of the 20 locations. All removed pins were requested to be retained and sent to the Department's Materials and Testing Laboratory for evaluation testing. A large number of the pins were destroyed during removal and some were discarded during construction. The following criteria was established by department personnel for MTD's testing of the pins and defect comparisons with consulting engineer's test results: 1) modified ASTM A388 standard test, using 18 degree transducer; 2) 1/16 inch saw notches used as reference standard; 3) straight beam and angle test probes for UT of in-place pins; 4) 45 degree and 70 degree angle beam bore hole test probe for verification of pin defects.

Paper Details

Date Published: 19 May 1995
PDF: 5 pages
Proc. SPIE 2456, Nondestructive Evaluation of Aging Bridges and Highways, (19 May 1995); doi: 10.1117/12.209783
Show Author Affiliations
William J. Miller, Pennsylvania Dept. of Transportation (United States)
M. K. Chaney, Pennsylvania Dept. of Transportation (United States)

Published in SPIE Proceedings Vol. 2456:
Nondestructive Evaluation of Aging Bridges and Highways
Steven B. Chase, Editor(s)

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