This report contains the findings of a study to develop a methodology for considering substructure redundancy in the design and evaluation of highway bridges. The report builds on the work on bridge superstructure redundancy presented in NCHRP Report 406 and integrates the findings in that report into a single recommended specification for addressing bridge redundancy during design. The report documents the methodology used to develop and calibrate a process for quantifying redundancy in bridge structures and for calculating appropriate adjustment factors to maintain a uniform level of structural reliability. An appendix to the report contains recommended language for introducing the quantification of redundancy for superstructures and substructures into the AASHTO LRFD Bridge Design Specifications. (A) This report may be accessed by Internet users at http://gulliver.trb.org/publications/nchrp/nchrp_rpt_458-a.pdf / http://gulliver.trb.org/publications/nchrp/nchrp_rpt_458-b.pdf
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