Structural response and resilience of posttensioned steel frames under column loss

Yan Fei Zhu, Chang Hong Chen*, Leon M. Keer, Ying Huang, Yao Yao

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

The structural resilience of a steel frame with posttensioned (PT) connections under a column-removal scenario is numerically investigated. Four high-fidelity PT connections finite element (FE) models are developed and compared with the experimental results in the literature, and the developed models describe the behavior of the connections accurately. A method to evaluate middle column removal scenario in a one-story, two-bay frame with PT connections is proposed. The corresponding resisting mechanisms are quantitatively evaluated, which consists of beam mechanism contributed mainly by beam arching action and strand catenary mechanism. A three-dimensional FE model of beam-column substructure with PT connections are developed considering the effect of increasing vertical displacement. Vertical responses associated with different working cases are assessed and the influences of strands, beams and top-seat angles are investigated. In addition, a quantitative evaluation index of the structural resilience under a column-removal scenario for a PT steel frame is proposed based on vertical response displacement. A resilience-based design approach is proposed for the practical engineering design.

Original languageEnglish (US)
Pages (from-to)107-119
Number of pages13
JournalJournal of Constructional Steel Research
Volume158
DOIs
StatePublished - Jul 2019

Keywords

  • Alternate path method
  • Nonlinear static analysis
  • Posttensioned connection
  • Progressive collapse
  • Resilience

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Metals and Alloys

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