Overstrength assessment of innovative metallic I-shaped damper

초록

This study investigates the overstrength factor (Omega) of an innovative I-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 (lambda w, lambda f, lambda & planckh;)-a parametric study was conducted using 100 finite element models validated against experimental tests. The results demonstrate that all considered I-shaped dampers exhibit [ values exceeding 1.5, surpassing the AISC recommendations for shear links. It was found that while increasing web plate thickness significantly improves ultimate strength (up to 2.35 times), it tends to reduce [. Conversely, increasing flange thickness enhances both ultimate strength and [, challenging current guidelines that often neglect flange contributions. Specifically, within the flange slenderness range of 10 <= lambda f <= 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 lambda w, <= 33 and a strength ratio of psi> 5.0 . These findings offer quantitative insights for refining design guidelines to accurately reflect the damper's overstrength capacity.

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