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Title: Ultimate Stress of Large-Diameter Strands in Simple Unbonded Post-Tensioned Beams

Author(s): Wei Zhou and Yahui Hu

Publication: Structural Journal

Volume: 115

Issue: 5

Appears on pages(s): 1379-1391

Keywords: flexural; large-diameter strand; post-tensioned; prestressed concrete; strength; stress increase; ultimate stress; unbonded

DOI: 10.14359/51702249

Date: 9/1/2018

Abstract:
It is necessary to use large-diameter (0.7 and 0.85 in. [17.8 and 21.6 mm]) strands in unbonded post-tensioned structures to address the question on flexural response, particularly regarding its strength. A series of experiments were conducted to investigate the ultimate stress of the large-diameter strands as unbonded tendons in simply supported members. Two crucial factors—prestressing reinforcement index and global reinforcement index—are obtained from the cross-sectional equilibrium equation and test data of the present and already-existing experiments. Both crucial factors are used to derive equations to predict the increase in stress and ultimate stress of large and normal diameter strands. Evidences support the behavior and demonstrate the feasibility of large diameter strands for PT structure in terms of static loading.