Steel and Composite Structures

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Seismic optimization and performance assessment of special steel moment-resisting frames considering nonlinear soil-structure interaction

  • Saeed Gholizadeh (Department of Civil Engineering, Urmia University) ;
  • Arman Milany (Department of Civil Engineering, Urmia University) ;
  • Oguzhan Hasancebi (Department of Civil Engineering, Middle East Technical University)
  • Received : 2022.12.28
  • Accepted : 2023.04.13
  • Published : 2023.05.10
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Abstract

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.

Keywords

References

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