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Steel and Composite Structures
  Volume 47, Number 3, May10 2023 , pages 339-353

Seismic optimization and performance assessment of special steel moment-resisting frames considering nonlinear soil-structure interaction
Saeed Gholizadeh, Arman Milany and Oguzhan Hasançebi

    The primary objective of the current study is to optimize and evaluate the seismic performance of steel momentresisting frame (MRF) structures considering soil-structure interaction (SSI) effects. The structural optimization is implemented in the context of performance-based design in accordance with FEMA-350 at different confidence levels from 50% to 90% by taking into account fixed- and flexible-base conditions using an efficient metaheuristic algorithm. Nonlinear response-history analysis (NRHA) is conducted to evaluate the seismic response of structures, and the beam-on-nonlinear Winkler foundation (BNWF) model is used to simulate the soil-foundation interaction under the MRFs. The seismic performance of optimally designed fixed- and flexible-base steel MRFs are compared in terms of overall damage index, seismic collapse safety, and interstory drift ratios at different performance levels. Two illustrative examples of 6- and 12-story steel MRFs are presented. The results show that the consideration of SSI in the optimization process of 6- and 12-story steel MRFs results in an increase of 1.0 to 9.0 % and 0.5 to 5.0 % in structural weight and a slight decrease in structural seismic safety at different confidence levels.
Key Words
     confidence level; performance-based design; soil-structure interaction; steel special moment frame; structural optimization
Saeed Gholizadeh and Arman Milany:Department of Civil Engineering, Urmia University, Urmia, Iran

Oguzhan Hasançebi:Department of Civil Engineering, Middle East Technical University, Ankara, Turkey

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