United States Department of Transportation
i
Brittle-ductile transition of steel bridges, volume I : final report.
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1990-05-01
[PDF-2.60 MB]
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Edition:Final report.
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;
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Abstract:The transition behavior of bridge steels and weldments largely determines the ir toughness under
service loading rates and temperatures. Two aspects of the transition were investigated in this
project: The first was to develop a better understanding of the micro-mechanics of fracture of
bridge steels and welds. This study showed that the AASHTO yield strength dependent relationship
between loading rate and test temperature should be expected.
The second larger study consisted of measuring the fracture toughness of A572, A588, A852 and
AS14 plates, and Submerged Arc Weldments, at bridge loading rates using CTOD specimens. The latter
are analyzed by elastic-plastic techniques so that testing could be extended into the transition
region.
The tests supported an earlier FHWA study and showed that the AASHTO CVI specifications for 1-
and 2-in (25 and 51 mm) thick A572 and A588 &nd l-in (25 mm) thick A852 and A514 are satisfactory.
However, the Guide Specifications were found to be nonconservative for thick, heat-treated plates.
This may be a result of the fact that Charpy specimens are sampled at the plate quarter-thickness
wh ile cracks initia te on the plate midplane. If further research supports this observation, it
would be advisable to sample CVI near the midplane of plates for all plates.
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