Seismic Performance Analysis of a 15-Story Steel Structure Equipped with Viscous Fluid Dampers and Diverse Frame Systems

Derakhshan Nezhad, Amir Hossein; Mirzaie Aliabadi, Mahbobeh; Derakhshan Nezhad, Alireza

Seismic Performance Analysis of a 15-Story Steel Structure Equipped with Viscous Fluid Dampers and Diverse Frame Systems

Document Type : Original Article

Authors

Amir Hossein Derakhshan Nezhad ¹

Mahbobeh Mirzaie Aliabadi ²

Alireza Derakhshan Nezhad ³

¹ Master's student in civil-structural engineering, Department of Civil Engineering, Technical and Engineering Faculty, Behbahan Khatam Alanbia University of Technology, Iran.

² Assistant Professor, Department of Civil Engineering, Technical and Engineering Faculty, Behbahan Khatam Alanbia University of Technology, Iran.

³ Bachelor of Civil Engineering, Department of Civil Engineering, Faculty of Technology and Engineering, Islamic Azad University Abadan, Iran.

Abstract

Ensuring seismic resilience and optimizing structural response under earthquake excitations are critical aspects of modern performance-based seismic design. This study conducts a comprehensive numerical investigation into t he seismic behavior of a 15-story steel structure equipped with viscous fluid dampers (VFDs) and compares its p erformance with three alternative lateral force-resisting systems: special divergent braced frames (SDBFs), speci al converging braced frames (SCBFs), and medium bending frames (MBFs). The analyses employ nonlinear tim e-history simulations and pushover analysis using ETABS to evaluate seismic response parameters, including ba se shear, inter-story drift ratios, residual displacements, and fundamental structural period. The results reveal tha t VFD-equipped structures exhibit superior seismic performance, achieving a reduction of up to 72% in base she ar and 73% in peak lateral displacement compared to conventional bracing and frame systems. Furthermore, the integration of VFDs leads to a remarkable 106% reduction in the fundamental period, significantly enhancing en ergy dissipation capacity and mitigating structural damage. These findings underscore the efficacy of viscous da mpers as a passive control mechanism, providing enhanced structural stability, reduced seismic vulnerability, an d improved post-earthquake functionality, making them a viable solution for high-rise steel structures in seismic ally active regions.

Keywords

Seismic control

Viscous damper

Energy dissipation

Time history