A viscoelastic model for the long-term deflection of segmental prestressed box girders

Angela Beltempo, Oreste S. Bursi, Carlo Cappello, Daniele Zonta, Massimiliano Zingales

Research output: Contribution to journalArticle

8 Citations (Scopus)
23 Downloads (Pure)

Abstract

Most of segmental prestressed concrete box girders exhibit excessive multidecade deflections unforeseeable by past and current design codes. To investigate such a behavior, mainly caused by creep and shrinkage phenomena, an effective finite element (FE) formulation is presented in this article. This formulation is developed by invoking the stationarity of an energetic principle for linear viscoelastic problems and relies on the Bazant creep constitutive law. A case study representative of segmental prestressed concrete box girders susceptible to creep is also analyzed in the article, that is, the Colle Isarco viaduct. Its FE model, based on the aforementioned energetic formulation, was successfully validated through the comparison with monitoring field data. As a result, the proposed 1D FE model can effectively reproduce the past behavior of the viaduct and predict its future behavior with a reasonable run time, which represents a decisive factor for the model implementation in a decision support system.

Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalComputer-Aided Civil and Infrastructure Engineering
Early online date25 Oct 2017
DOIs
Publication statusE-pub ahead of print - 25 Oct 2017

Keywords

  • prestressed concrete box girders
  • multidecade deflections
  • creep
  • shrinkage
  • finite element (FE) formulation

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