Overstrength assessment of innovative metallic I-shaped damper

Seong-Hoon Jeong , Ali Ghamari , Majid M. Rad

Abstract

This study investigates the overstrength factor (Ω) of an innovative -shaped metallic shear damper designed for enhancing seismic resilience in concentrically braced frames (CBFs). To evaluate the influence of geometric variables-including web/flange thickness, damper height, and slenderness ratios (λw, λf, λh) -a parametric study was conducted using 100 finite element models validated against experimental tests. The results demonstrate that all considered I-shaped dampers exhibit Ω values exceeding 1.5, surpassing the AISC recommendations for shear links. t was found that while increasing web plate thickness significantly improves ultimate strength (up to 2.35 times, it tends to reduce Ω. Conversely, increasing flange thickness enhances both ultimate strength and Ω, challenging current guidelines that often neglect flange contributions. Specifically, within the flange slenderness range of 10 ≤ λf ≤15 , the reduction rate of structural parameters is most significant. To ensure balanced seismic performance and economic efficiency, this study proposes designing dampers with a web slenderness ratio of λw ≤ 33 and a strength ratio of ψ > 5.0. These findings offer quantitative insights for refining design guidelines to accurately reflect the damper's overstrength capacity.

Key Words

capacity; -shaped; metallic damper; overstrength; slenderness

Address

Seong-Hoon Jeong — Department of Architectural Eng, Inha University, 100 Inha-ro Michuhol-gu, Incheon 22212, Republic of Korea
Ali Ghamari — Department of Civil Engineering, Il.c., Islamic Azad University, Ilam, Iran
Majid M. Rad — Department of Structural and Geotechnical Engineering, Széchenyi István University, 9026 Győr, Hungary

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