Abstract

This study presents a comprehensive assessment of the seismic performance of eccentrically braced frames (EBFs) incorporating long link elements, subjected to ground motion records representative of Chilean subduction earthquakes. The research methodology integrates nonlinear static and dynamic analyses, employing numerical link models calibrated against experimental data. A total of over 4200 structural simulations were conducted, considering variations in building height and local soil conditions. From a seismic design of models studied, the seismic design parameters were obtained using the FEMA P695 methodology. The results show that soil type significantly influences both ductility demand and seismic force levels. Also, models representing 12- and 16-story buildings failed to achieve the ductility levels required by the response modification factor (R-factor) prescribed in the Chilean seismic code NCh433. A comparative analysis of key design parameters is included, highlighting discrepancies between numerical results and current code provisions. Overall, the study provides updated fragility curves and design-relevant insights that support the advancement of performance-based seismic design for steel structures. © 2025 Published by Elsevier Ltd on behalf of Institution of Structural Engineers.