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Review of State of the Art and Practice of Strand Debonding for Pretensioned Girders

Gaur, Avdhesh
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406880547

Abstract Details

2014, MS, University of Cincinnati, Engineering and Applied Science: Civil Engineering.
Partial debonding is considered as a less complex, safer and more economical way of addressing serviceability issues caused by end cracking in girders. Debonding is an established method with distinct variations among different state and international specifications and unspecified local practices. The American Association of State Highway and Transportation Officials (AASHTO) LRFD Specifications limit debonding to 25% of the strands and these limits appear to be based on a single study (Shahawy et al. 1993). Practices of individual state DOTs vary, are based on experience, and sometimes exceed the AASHTO LRFD Specification limit. High levels of debonding can lead to unsafe design while lower levels of debonding can be uneconomical. Therefore, it is of vital importance to have a better understanding and investigation of effects of debonding on various girder performance metrics. This investigation and understanding can be facilitated through identification of critical factors by getting information on various prevalent practices and rationale behind these practices in different States as well as international jurisdictions. This report is aimed to identify the various factors or detailing requirements that can be critical in developing a unified approach to design of partially debonded strand regions. The selected methodology for achieving these objectives includes literature review of theoretical/experimental studied relevant to focus of this study, and through review of specified/unspecified U.S. and international practices and an investigation of their rationale. Information on debonding specification/unspecified local practice is achieved though surveys conducted by the National Academies, review of design specification of various states and international jurisdictions, and personal communications with a number of practicing engineers. This report presents all major observations, findings, and conclusions based on literature review, review of specified/unspecified U.S. and international practices, and review and validation of basis of current AASHTO LRFD limitations on debonding of strands in pretensioned. The data from a study by Shahawy, et al. are reanalyzed using analysis methods and code provisions not available at the time of the original work. This reanalysis shows that higher debonding limits can be justified as long as release stresses are controlled and the girder meets the strength requirements of the current AASHTO Specifications.
Richard Miller, Ph.D. (Committee Chair)
Gian Rassati, Ph.D. (Committee Member)
Bahram Shahrooz, Ph.D. (Committee Member)
226 p.
Civil Engineering

Recommended Citations

Citations

  • Gaur, A. (2014). Review of State of the Art and Practice of Strand Debonding for Pretensioned Girders [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406880547

    APA Style (7th edition)

  • Gaur, Avdhesh. Review of State of the Art and Practice of Strand Debonding for Pretensioned Girders. 2014. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406880547.

    MLA Style (8th edition)

  • Gaur, Avdhesh. "Review of State of the Art and Practice of Strand Debonding for Pretensioned Girders." Master's thesis, University of Cincinnati, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406880547

    Chicago Manual of Style (17th edition)

ucin1406880547
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This open access ETD is published by University of Cincinnati and OhioLINK.