United States Department of Transportation
i
Guidelines for analyzing the capacity of d-regions with premature concrete deterioration of ASR/DEF.
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2015-03-01
[PDF-12.04 MB]
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Abstract:When a bridge engineer encounters a design or analysis problem concerning a bridge substructure,
that structure will commonly have a mixture of member types, some slender, and some squat.
Slender members are generally governed by flexure, and normal beam theory should suffice for
analysis and design. Squat members can often be handled by beam theory too, although nowadays
designers have a choice and may opt to use strut-and-tie (SAT) models.
When the structure possesses a mixture of beam (B-) regions and deep or disturbed (D-)
regions the dilemma facing the structural engineer is: What method should one use for structural
analysis and design?
The issue becomes even more murky when a structure already exists, but shows signs of
damage and deterioration from the effects of Alkali Silica Reaction (ASR), Delayed Ettringite
Formation (DEF), or other deterioration mechanisms. The engineer is faced with a second
dilemma: How do deteriorated material properties get incorporated into the analysis?
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