Transfer, Development, and Splice Length for StrandReinforcement in High-Strength Concrete






SUMMARY

Transfer, Development, and Splice Length

for Strand/Reinforcement in High-Strength Concrete



Article 5.4.2.1 of the 3rd edition of the AASHTO LRFD Bridge Design Specifications limits

the applicability of the specifications for concrete compressive strengths of 10,000 psi or less

unless physical tests are made to establish the relationships between concrete strength and

other properties (AASHTO 2004). A comprehensive, article-by-article review of Section 5 of

the AASHTO LRFD Bridge Design Specifications pertaining to transfer, development, and splice

length for strand/reinforcement was performed under NCHRP Project 12-60 to identify all the

provisions that have to be revised to extend their use to high-strength, normal-weight concrete

up to 15 ksi. Upon completion of the experimental work under NCHRP Project 12-60, draft

specifications and accompanying commentary for provisions to extend the application of the

LRFD bridge design specifications to high-strength concrete were developed. The provisions

cover the transfer and development length of prestressing strand and the development and

splice length of reinforcement in normal-weight concrete with compressive strengths up to

15 ksi. Researchers from Purdue University and Oklahoma State University have jointly prepared this report.


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