Flexural Behavior of Posttensioned Concrete Beams with Unbonded High-Strength Strands

Flexural Behavior of Posttensioned Concrete Beams with Unbonded High-Strength Strands

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This paper assesses the applicability of high-strength strands to current design codes and various existing equations.To evaluate the flexural performance of posttensioned concrete members with Grade 2400 strands, a flexural experiment was conducted on eleven specimens.Test variables included the tensile strength of strands, the number of strands, the cross-section shape, and anchorage zone reinforcement details.The test results were compared with ACI 318-19, AASHTO, and equations of Du john tory hair and Tao, Naaman and Alkhari, and Harajli to evaluate the orly ethereal plane applicability of flexural strength equations for posttensioned concrete members using unbonded high-strength strands.

Results indicated that the provisions of ACI 318-19 and AASHTO design codes and the existing equations underestimated the increased stress of the high-strength strands.Additionally, results demonstrate that improved equations are needed to consider the strain-compatibility model, plastic hinge length, and relationship between bonded reinforcement, concrete, and prestressing steel in posttensioned members using high-strength strands.