Behavior of 1:5-Scale Segmental Concrete Girders With External and Internal Tendons

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Title: Behavior of 1:5-Scale Segmental Concrete Girders With External and Internal Tendons

Author(s): B. G. Rabbat and K. Sowlat

Publication: Special Publication

Volume: 120

Issue:

Appears on pages(s): 305-314

Keywords: bridges (structures); girders; post-tensioning; precast concrete; prestressed concrete; prestressing steels; research; scale (ratio); segmental construction; structural design; tests; unbonded prestressing; Design

Date: 6/1/1990

Abstract:
The behavior of two segmental concrete girders incorporating external tendons was compared to that of a similar girder with internal tendons. The girders were 31 ft long and consisted of 11 match-cast segments. Test variable was the location of the tendon ducts. In the first girder, the ducts were embedded in the girder cross section. The ducts of the second girder were external to the concrete cross section except at pier segments and intermediate deviation diaphragms. The third girder was similar to the second except that portions of the external ducts were embedded in a second-stage concrete cast. The segments included multiple shear keys and were dry jointed. All ducts were grouted. Each girder was simply supported over a 30-ft span and loaded statically to destruction under a two point load. The first and third girders attained their respective flexural strengths predicted by the classic bending theory for monolithic girders with bonded tendons. The second girder exceeded the flexural strength predicted by the provisions of the AASHTO specifications for members with unbonded tendons.