Effect of Supplemental Bonding of External Tendons and Addition of Internal Tendons on the Strength and Ductility of Post-Tensioned Segmental Bridges

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Title: Effect of Supplemental Bonding of External Tendons and Addition of Internal Tendons on the Strength and Ductility of Post-Tensioned Segmental Bridges

Author(s): Azez Hindi

Publication: Special Publication

Volume: 160

Issue:

Appears on pages(s): 169-190

Keywords: bridges (structures); ductility; post-tensioning; renovating; prestressed concrete; prestressing steels; segmental construction; strength; Structural Research

Date: 6/1/1996

Abstract:
Reports tests of a three span reduced scale segmental box girder bridge model post-tensioned with external tendons. The objectives of this study included the determination of the effect of using external tendons discretely bonded at an intermediate diaphragm in each segment and/or using grouted internal tendons on the strength and ductility of external tendon bridges. The scope included experimentally determining and analytically predicting the external tendon maximum stress and the flexural capacity of the bridge. The flexural tests, performed on the three span model, were conducted in three phases. In the first phase, the external tendons were discretely bonded at only two or four intermediate diaphragms in each span. In the second phase, the external tendons were discretely bonded at all ten intermediate diaphragms in each span. In the third phase, supplementary ungrouted or grouted internal tendons were added. The test results indicated that discrete bonding of external tendons and/or using grouted internal tendons substantially improved the strength and ductility of this kind of construction.