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Evaluation of the seismic performance factors for steel diagrid structural systems using FEMA P-695 and ATC-19 procedures

Rofooei, F. R ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1007/s10518-020-00876-2
  3. Publisher: Springer , 2020
  4. Abstract:
  5. The diagrid structural systems are mainly used for their structural capabilities and architectural aesthetic possibilities which are provided by the unique geometric configurations of these systems. However, the seismic performance factors of these structural systems are not yet explicitly recommended in the existing building codes. In this study, the seismic performance factors (SPFs) of 6- to 24-story steel diagrid structures are determined considering the post-buckling behavior of diagonal members in compression. Also, the effect of change in span length and the diagonal angles on the SPFs of diagrid structures is studied. The ATC-19 coefficient method is used for calculating the SPFs while FEMA P-695 approach is adopted for evaluating the accuracy of the computed factors. Also, the seismic collapse capacity of these structures considering uncertainties in ground motion, modeling, design, and test data is evaluated based on the FEMA P-695 methodology. The OpenSees software is used for modeling and performing the numerical analyses. The obtained results indicate that by increasing the height of diagrid structures, the over-strength, the response modification factor and the median collapse intensity decrease while the ductility factor increases. It is also concluded that the adjusted collapse margin ratios of the diagrid archetypes are larger than the limits suggested by FEMA P-695. © 2020, Springer Nature B.V
  6. Keywords:
  7. Collapse capacity ; Diagrid structures ; Nonlinear dynamic analysis ; Nonlinear static analysis ; Seismic performance factors ; Steel structures ; Building codes ; Seismic waves ; Seismology ; Uncertainty analysis ; Coefficient methods ; Collapse capacities ; Geometric configurations ; Postbuckling behavior ; Response modification factors ; Seismic Performance ; Structural capabilities ; Structural systems ; Seismic design ; Architectural design ; Buckling ; Building code ; Compressive strength ; Ductility ; Geogrid ; Performance assessment ; Seismic hazard ; Seismic property ; Seismic response ; Standard (regulation) ; Steel
  8. Source: Bulletin of Earthquake Engineering ; Volume 18, Issue 10 , 2020 , Pages 4873-4910
  9. URL: https://link.springer.com/article/10.1007/s10518-020-00876-2