In October 1988, the Federal Highway Administration (FHWA) issued a memorandum that placed restrictions on the use of seven-wire strands for pretensioned concrete members in highway bridge applications. As a result of this memorandum, research projects on strand transfer and development lengths were initiated at many institutions across the United States and Canada, often resulting in conflicting design recommendations for transfer and development lengths of pretensioned strands. In an attempt to reconcile some of the differences in the design recommendations, the FHWA conducted an independent review of the recent research. This paper represents a summary of that effort. The specific objectives of the study were: (1) .conduct a review of literature related to strand transfer and development length research; (2) analyze data from recent studies and rationalize discrepancies among conclusions drawn from these studies; and (3) recommend equations for strand transfer and development lengths consistent with the current state-of-knowledge.
