Stresses in End Blocks of a Post-Tensioned Beam

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Title: Stresses in End Blocks of a Post-Tensioned Beam

Author(s): Ti Huang

Publication: Journal Proceedings

Volume: 61

Issue: 5

Appears on pages(s): 589-602

Keywords:

Date: 5/1/1964

Abstract:
The stresses in the end blocks of a posttensioned prestressed concrete beam were studied by actual measurement with SR-4 strain gages, as well as by numerical analysis. The results were then compared with the computed values by the methods of Magnel and Guyon. Although no general conclusion was attempted, it was apparent from this study that both existing methods may be considerably in error in the estimation of critical vertical stress. It was also found that the vertical tensile stress is higher in an end block with a length-depth ratio of 1.5 than in a block with a ratio of 1, and that a critical tensile zone exists near the interior of the end block, if the beam body is of I, T, or box shape.