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Development of fragility curves for existing residential steel buildings with concentrically braced frames

Bakhshi, A ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.24200/sci.2019.21498
  3. Publisher: Sharif University of Technology , 2019
  4. Abstract:
  5. The objective of this study is to develop analytical fragility curves for an ensemble of existing 3-to 6-story residential steel buildings with concentrically braced frames in 2 directions, designed during 2010 to 2015 in Qazvin, Iran. The buildings were modeled three-dimensionally in OpenSees considering braces buckling behavior. Maximum Inter-story Drift Ratio (.MIDR) and spectral acceleration at. fundamental period of the structure with 5% viscous damping (Sa(7,5%)) were considered as Damage Index (DI) and Intensity Measure (/M), respectively. Limit states were specified as discussed in FEMA 356. Ground motion record selection and uncertainties assessment were carried out based on FEMA P695 methodology. Analysis was performed using truncated Incremental Dynamic Analysis (IDA). Fragility function was defined as a log-normal Cumulative Distribution Function (CDF) and maximum likelihood method was used to estimate fragility parameters. According to the fragility curves obtained, seismic vulnerability of the structures generally increased as the number of stories rose. Concentration of the inelasticity was also found to be mainly at. the first, story level. The results also confirmed the fact that the record t o record variability is the main source of uncertainty in structural probabilistic evaluation. © 2019 Sharif University of Technology. All rights reserved
  6. Keywords:
  7. Analytical fragility curve ; Fema 356 ; Fema p695 ; Maximum likelihood method ; Opensees ; Steel concentrically braced frames ; Damage detection ; Distribution functions ; Housing ; Structural frames ; Concentrically braced frames ; Fragility curves ; Maximum likelihood methods ; Truncated ida ; Maximum likelihood ; Analytical method ; Buckling ; Building ; Damping ; Maximum likelihood analysis ; Seismic response ; Steel ; Uncertainty analysis ; Vulnerability ; Iran ; Qazvin [Iran]
  8. Source: Scientia Iranica ; Volume 26, Issue 4A , 2019 , Pages 2212-2228 ; 10263098 (ISSN)
  9. URL: http://scientiairanica.sharif.edu/article_21498.html