Excessive multi-decade deflections of prestressed concrete bridges: How to avoid them and how to exploit their monitoring to improve creep prediction model

Zdeněk P. Bažant*, Qiang Yu, Kyung Tae Kim, Mija H. Hubler, Vit Šmilauer, Lukáš Vráblik, Matěj Lepš, Vladimir Křistek

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Stimulated by the excessive deflections and collapse of the KB Bridge of world-rercord span, the deflection histories of 56 similar bridges, most of them excessive, have been collected by RILEM TC-MDC. They amount to a wake-up call: The standard creep recommendations of engineering societies have been misleading, and thus their revision is imperative. They also confirm a simple feature: The multi-decade trend of bridge deflection, and by implication also the concrete creep law, is a logarithmic curve in time, which has no final bound, in contrast to the existing standard recommendations. Despite the lack of success in obtaining full information on the highly deflected bridges, it is possible to benefit by statistical analysis from the bridge deflection data for improvements of the concrete creep model. The proceedings paper briefly outlines how to do that, and the full paper presents some more detail and the figures.

Original languageEnglish (US)
Title of host publicationfib Symposium PRAGUE 2011
Subtitle of host publicationConcrete Engineering for Excellence and Efficiency, Proceedings
EditorsVlastimil Sruma
PublisherCzech Concrete Society
Pages827-830
Number of pages4
ISBN (Electronic)9788087158296
StatePublished - Jan 1 2011
Eventfib Symposium PRAGUE 2011: Concrete Engineering for Excellence and Efficiency - Praha, Czech Republic
Duration: Jun 8 2011Jun 10 2011

Publication series

Namefib Symposium PRAGUE 2011: Concrete Engineering for Excellence and Efficiency, Proceedings
Volume2

Other

Otherfib Symposium PRAGUE 2011: Concrete Engineering for Excellence and Efficiency
CountryCzech Republic
CityPraha
Period6/8/116/10/11

Keywords

  • Bridge deflections
  • Concrete creep
  • Prestressed box girders
  • Standard recommendations for creep
  • Statistical analysis
  • Sustainable design

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Architecture

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  • Cite this

    Bažant, Z. P., Yu, Q., Kim, K. T., Hubler, M. H., Šmilauer, V., Vráblik, L., Lepš, M., & Křistek, V. (2011). Excessive multi-decade deflections of prestressed concrete bridges: How to avoid them and how to exploit their monitoring to improve creep prediction model. In V. Sruma (Ed.), fib Symposium PRAGUE 2011: Concrete Engineering for Excellence and Efficiency, Proceedings (pp. 827-830). (fib Symposium PRAGUE 2011: Concrete Engineering for Excellence and Efficiency, Proceedings; Vol. 2). Czech Concrete Society.