Time-variant reliability analysis of widened deteriorating prestressed concrete bridges considering shrinkage and creep

Bing Tu, Zhi Fang, You Dong, Dan M. Frangopol

Research output: Journal article publicationJournal articleAcademic researchpeer-review

23 Citations (Scopus)

Abstract

Thus, relevant studies on the performance assessment of widened bridges are needed. This paper presents a computational probabilistic framework for time-variant reliability analysis of widened concrete highway bridges in a systematic manner considering the effects of live-load redistribution, structural deterioration, and concrete shrinkage and creep. Specifically, differences and inconsistences between the new and existing structures regarding live-load distribution, reinforcement corrosion, and concrete shrinkage and creep are considered. A finite element grillage model is constructed to investigate live-load distribution factors and internal axial forces caused by concrete shrinkage and creep. The uncertainties associated with shrinkage and creep effects are accounted for within the probabilistic framework. The flexural moment resistance of the bridge girder is computed considering the combined effects of the shrinkage-and-creep-induced axial force and structural deterioration. Ultimately, the system reliability of the widened bridge is calculated. The proposed probabilistic framework is applied to a widened prestressed concrete T-girder bridge.
Original languageEnglish
Pages (from-to)1-16
Number of pages16
JournalEngineering Structures
Volume153
DOIs
Publication statusPublished - 15 Dec 2017

Keywords

  • Corrosion
  • Live-load distribution factor
  • Shrinkage and creep
  • System reliability
  • Widened concrete bridge

ASJC Scopus subject areas

  • Civil and Structural Engineering

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