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Transfer and Development Lengths of Steel Strands in Full-Scale Prestressed Self-Consolidating Concrete Bridge Girders

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Title: Transfer and Development Lengths of Steel Strands in Full-Scale Prestressed Self-Consolidating Concrete Bridge Girders
Author(s): Pozolo, Andrew M.
Advisor(s): Andrawes, Bassem
Department / Program: Civil & Environmental Eng
Discipline: Civil Engineering
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: M.S.
Genre: Thesis
Subject(s): Self-consolidating concrete prestressed concrete seven-wire strand pullout transfer length development length hollow box girders I-girders finite element analysis
Abstract: Self-consolidating concrete (SCC) is a workable yet stable concrete which flows easily and consolidates under its own weight. Its unique properties can substantially reduce the labor required to pour complex or heavily reinforced structural members. Over the past decade, the American precast industry has taken significant strides to adopt SCC in commercial projects, though concern about early-age bond behavior has limited the material’s application in prestressed members. A keen understanding of SCC’s bond strength, including its impact on transfer and development lengths in prestressed members, is essential to safely implement SCC in prestressed design. The Illinois Department of Transportation (IDOT) has sponsored a three-phase study exploring the bond behavior of steel strands in prestressed bridge girders. In the first phase, 56 pullout tests were conducted to compare the performance of seven-wire strands embedded in SCC and conventionally-consolidated concrete blocks. In the second phase, transfer lengths of prestressing strands in two SCC hollow box girders and two SCC I-girders were determined experimentally. In the third phase, the development length of strands in the two box girders was determined through a series of iterative flexural tests. This thesis details the three phases of the IDOT study and compares results to industry standards and requirements of the American Concrete Institute and the American Association of State Highway and Transportation Officials. Results are also compared to analytical methods proposed in the literature. Additionally, a systematic method is developed to predict transfer lengths in full-scale specimens using pullout test data and finite element analysis. The proposed method may be useful when large-scale testing is impractical in terms of time or cost.
Issue Date: 2011-01-14
URI: http://hdl.handle.net/2142/18443
Rights Information: Copyright 2010 Andrew M. Pozolo
Date Available in IDEALS: 2011-01-14
Date Deposited: December 2
 

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