Pervasive lifetime inadequacy of long-span box girder bridges and lessons for multi-decade creep prediction

Zdenek P Bazant*, R. Wendner, M. H. Hubler, Qiang Yu

*Corresponding author for this work

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

1 Scopus citations

Abstract

The present study was stimulated by the paradigm of KB Bridge in Palau, a record span segmentally erected concrete box girder, which deflected excessively within 18 years, and collapsed 3 months after remedial prestressing. Computations at Northwestern showed that obsolete creep and shrinkage models in standard recommendations are largely to blame. A literature search found that 68 further spans with similar excessive deflections and service lives shortened to 20-40 years were identified. Outlined is a method of 3D FE computation of multi-decade creep effects. It is shown that the computations match the multi-decade bridge observations of the KB and several other bridges provided one uses a recalibrated B3 model, while the obsolete creep and shrinkage models lead to severe underestimation of the multi-decade deflections and prestress losses. A recalibration of the B3 model is achievable through statistical coupling of partial data on bridge deflections with a world-wide laboratory database.

Original languageEnglish (US)
Title of host publicationLife-Cycle and Sustainability of Civil Infrastructure Systems - Proceedings of the 3rd International Symposium on Life-Cycle Civil Engineering, IALCCE 2012
Pages42-50
Number of pages9
StatePublished - Oct 17 2012
Event3rd International Symposium on Life-Cycle Civil Engineering, IALCCE 2012 - Vienna, Austria
Duration: Oct 3 2012Oct 6 2012

Other

Other3rd International Symposium on Life-Cycle Civil Engineering, IALCCE 2012
CountryAustria
CityVienna
Period10/3/1210/6/12

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Safety, Risk, Reliability and Quality

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