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Substructures (Pbpbyb)

Definition
All those parts of a structure below the bearings of simple and continuous spans, skewbacks, or arches and tops of footings of rigid frames; including backwalls, wingwalls, and wing protection railings. Also, structural parts of the bridge that support the horizontal span. (Source: AASHTO Glossary)
Broader Term
Structural members by elevation (Pbpby)
Related Terms (Hierarchical)
Superstructures (Pbpbyp)