Strength and Ductility of a Three-Span Externally Post-Tensioned Segmental Box Girder Bridge Model

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Title: Strength and Ductility of a Three-Span Externally Post-Tensioned Segmental Box Girder Bridge Model

Author(s): Robert J. F. Macgregor, Michael E. Kreger, and John E. Breen

Publication: Special Publication

Volume: 120

Issue:

Appears on pages(s): 315-338

Keywords: box beams; bridges (structures); ductility; models; tests; post-tensioning; prestressing steels; segmental construction; strength; precast concrete; structural design; unbonded prestressing; Design

Date: 6/1/1990

Abstract:
An experimental investigation was conducted to examine the service and ultimate load behavior of segmentally precast box girder bridges with external post-tensioning tendons. A primary interest of this study was to examine the effect of joint type (dry versus epoxied joints) on the stiffness, strength, and ductility of the structure. A three-span reduced scale segmental box girder model was constructed, then tested in three stages. Flexural behavior was examined first, then shear tests were conducted on the damaged structure. Test results and observations are presented.