rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Electrochemical characterization and time-variant structural reliability assessment of post-tensioned, segmental concrete bridges
  name:
    name part: Pillai Gopalakrishnan, Radhakris.
    role:
      role term: creator
  name:
    name part: Trejo, David
    role:
      role term: thesis advisor.
  name:
    name part: Hueste, Mary Beth D. (Mary Beth Deisz)
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2010
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: In post-tensioned (PT) bridges, prestressing steel tendons are the major load carrying components. These tendons consist of strands, ducts, and cementitious grout that fill the interstitial space between the strands and ducts. However, inspections on PT bridges have reported the presence of voids, moisture, and chlorides inside grouted ducts as the major cause of accelerated corrosion of strands. Corrosion of the strands has resulted in PT bridge failures in Europe and tendon failures in the United States. As most of the PT bridges have high importance measures and the consequences of failure are significant, it is important to maintain high levels of safety and serviceability for these bridges. To meet this goal, bridge management authorities are in dire need of tools to quantify the long-term performance of these bridges. Time-variant structural reliability models can be useful tools to quantify the long-term performance of PT bridges. This doctoral dissertation presents the following results obtained from a comprehensive experimental and analytical program on the performance of PT bridges. 1) Electrochemical characteristics of PT systems 2) Probabilistic models for tension capacity of PT strands and wires exposed to various void and environmental conditions 3) Time-variant structural reliability models (based on bending moment and stress limit states) for PT bridges 4) Time-variant strength and service reliabilities of a typical PT bridge experiencing HS20 and HL93 loading conditions and different exposure conditions for a period of 75 years The experimental program included exposure of strand specimens to wet-dry and continuous-atmospheric conditions. These strand specimens were fabricated to mimic void and/or grout-air-strand (GAS) conditions inside the tendons. It was found that the GAS interface plays a major role in strand corrosion. The GAS interfaces that are typically located in the anchorage zones of harped PT girders or vertical PT columns can cause agg…
  note: by Radhakris Pillai Gopalakrishnan.
  note: "Major Subject: Civil Engineering"
  note: Title from author supplied metadata (automated record created 2010-08-20 08:31:34).
  note: Electronic resource.
  note: Doctor of Philosophy Texas A&M University 2009 http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-748
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major civil engineering
  subject:
    topic: tendon
  subject:
    topic: reliability
  subject:
    topic: strand
  subject:
    topic: corrosion
  subject:
    topic: electrochemical
  subject:
    topic: post-tensioned
  subject:
    topic: structural
  subject:
    topic: chloride
  subject:
    topic: long-term performance
  subject:
    topic: void
  subject:
    topic: post-tensioning
  subject:
    topic: prestress
  subject:
    topic: durability
  subject:
    topic: segmental
  subject:
    topic: probabilistic
  subject:
    topic: bridges
  identifier: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-748
  record info:
    record content source: TXA
    record creation date: 100907
    record change date: 20151201155029.0
    record identifier: in00002601682