Seismic performance design of steel moment frames equipped with self-centering viscous dampers by considering life cycle cost

Nazari, Shaghayegh; Ghasemi, Abbas; Rafsanjaneasl, Iman

doi:10.22065/jsce.2024.462924.3442

Seismic performance design of steel moment frames equipped with self-centering viscous dampers by considering life cycle cost

Document Type : Original Article

Authors

Shaghayegh Nazari ¹

Abbas Ghasemi ²

iman rafsanjaneasl ³

¹ MSc., ;Faculty of Civil and Earth Resources Engineering; Central Tehran Branch, Islamic Azad University; Tehran; Iran.

² Assistant Professor; Faculty of Civil and Earth Resources Engineering; Central Tehran Branch, Islamic Azad University; Tehran; Iran.

³ MSc., Faculty of Civil and Earth Resources Engineering; Central Tehran Branch, Islamic Azad University; Tehran; Iran.

10.22065/jsce.2024.462924.3442

Abstract

Earthquakes, as natural phenomena, can cause significant damage to structures and infrastructure, a longstanding concern in civil engineering. Engineers continually strive to improve methods for identifying vulnerable buildings and, when necessary, repairing or retrofitting them. Recent devastating seismic events worldwide have highlighted that insufficient structural performance can lead to excessive structural damage. This research aims to optimize the performance-based seismic design of steel moment-resisting frames equipped with self-centering viscous dampers. To achieve this, 3, 6, and 15-story frames, both retrofitted with and without viscous dampers, were designed. The seismic performance of these six two-dimensional frames was analyzed using OpenSees software, including pushover static analysis, time-history dynamic analysis, and incremental dynamic analysis, resulting in fragility curves for each frame. The study found that frames with dampers outperformed those without significantly. Additionally, life-cycle costs over 50 and 90 years at various performance levels Immediate Occupancy (IO), Life Safety (LS), and Collapse Prevention (CP) were calculated. For the 3-story frame, maintenance costs increased by 10.90%, 18.42%, and 13.12%, respectively. For the 6-story frame, costs rose by 19.50%, 10.90%, and 1.05%. For the 15-story frame, the increases were 12.53%, 26.83%, and 7.41%. In conclusion, structures with viscous dampers demonstrate better performance at a higher cost, justifying their inclusion in seismic design for enhanced structural resilience and longevity.

Keywords

Seismic Design

Steel Moment Frame

Performance-Based Design

Self-Centering Damper

Life Cycle Cost

Subjects

Repair, Rehabilitation and Retrofit of Structures

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