United States Department of Transportation
i
Transfer and Development Length of 15.2 Mm (0.6 in.) Diameter Prestressing Strand in High Performance Concrete: Results of the Hoblitzell-Buckner Beam Tests
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1995-06-01
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Edition:Research Report (9/94-6/95)
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Abstract:This study examines the transfer and development length of 15.2 mm (0.6 in.) diameter prestressing strand in high performance (high strength) concrete. Two 1067 mm (42.0 in.) deep rectangular beams, commonly called the Hoblitzell-Buckner beams, each with one row of 15.2 mm (0.6 in.) diameter strands at 51 mm (2.0 in.) spacing on center, were instrumented to measure the transfer and development length of the strands. Concrete strengths were 48.5 MPa (7040 psi) at transfer and 90.7 MPa (13,160 psi) at the time of development length testing. The strand surface condition was weathered or rusty. Transfer length was determined from the concrete strain profile at the level of the strands at transfer. The average transfer length of the strands in the specimen beams was observed to be 14.3 inches. Code equations and other proposed equations were found to be conservative in comparison with the measured value. Development length was determined from the results of four full-scale flexural tests on the Hoblitzell-Buckner beams with various embedment lengths. All four tests resulted in flexural failures, such that the development length of the strands was observed to be less than 78 inches. Measured values were compared to previous research results and proposed equations, including the AASHTO and ACI 318 code equations, which were found to be conservative in this case.
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