Test to Failure of a 54 Ft. Deteriorated Pretensioned Precast Concrete Deck Beam

Hawkins, Neil M.; Fuentes, Juan B.

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https://hdl.handle.net/2142/46345 Copy

Description

Title

Test to Failure of a 54 Ft. Deteriorated Pretensioned Precast Concrete Deck Beam

Author(s)

• Hawkins, Neil M.
• Fuentes, Juan B.

Issue Date

2000-05

Keyword(s)

Deck beam bridge, pretensioned beam, stiffness, cracking, strength, deterioration, corrosion, visual assessment.

Abstract

A 54-ft. long, 27 inch deep, deteriorated pretensioned deck beam was taken from an existing bridge and tested to failure under equal loads applied 7-ft either side of its midspan. A systematic visual condition assessment was made of the beam before testing. After testing, the concrete cover over the strands was removed and their condition assessed. The beam was sawn in half at the failure location and the section geometry recorded. Concrete and strand samples were recovered and their mechanical properties measured. The stiffness of the beam before cracking equaled that calculated using the measures properties of the cross-section and neglecting any damage due to local deterioration. The moment for first cracking equaled that calculated using the weakest section within the constant moment region. However, that cracking was confined to the most deteriorated location. A marked stiffness change did not occur until general cracking at a moment that equaled the cracking moment calculated neglecting any strand corrosion. The immediate post-cracking stiffness also agreed with that calculated neglecting any strand corrosion. The load for failure was 4% less than that calculated using the measured properties of the weakest section and the number of non-corroded strands. The beam failed by crushing of the concrete in the compression face near midspan. The deflection for failure was only 40% of the expected deflection for the number of strands found to be effective at the load for failure.

Series/Report Name or Number

FHWA-IL-UI-281

ISSN

0197-9191

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/46345

Sponsor(s)/Grant Number(s)

Illinois Department of Transportation IHR-2

Copyright and License Information

No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161

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