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

Gholizadeh S., Milany A., HASANÇEBİ O.

STEEL AND COMPOSITE STRUCTURES, vol.47, no.3, pp.339-353, 2023 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 47 Issue: 3
  • Publication Date: 2023
  • Doi Number: 10.12989/scs.2023.47.3.339
  • Journal Name: STEEL AND COMPOSITE STRUCTURES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Compendex, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.339-353
  • Keywords: confidence level, performance-based design, soil-structure interaction, steel special moment frame, structural optimization
  • Middle East Technical University Affiliated: Yes

Abstract

The primary objective of the current study is to optimize and evaluate the seismic performance of steel moment -resisting 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 inter -story 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.