Rocking Concrete Shear Walls with Longitudinal-Perpendicular XADAS Dampers: Seismic Interaction with Moment Frames

Vahid-Vahdattalab, Farzin; Ghandi, Elham; Shafei, Erfan

doi:10.22059/ceij.2025.393248.2292

Rocking Concrete Shear Walls with Longitudinal-Perpendicular XADAS Dampers: Seismic Interaction with Moment Frames

Articles in Press

Authors

¹ Department of civil Engineering, Faculty of engineering, University of Mohaghegh Ardabili, Ardabil, Iran

² Department of civil engineering, Faculty of engineering, University of Mohaghegh Ardabil, Ardabil, Iran

³ department of civil Engineering, Faculty of civil engineering, Urmia University of Technology, Urmia, Iran.

10.22059/ceij.2025.393248.2292

Abstract

This study explores the seismic interaction between a concrete moment-resisting frame and a rocking shear wall equipped with both longitudinal and perpendicular dampers. Unlike earlier works that placed dampers only along the wall’s length, this research introduces transverse dampers mounted perpendicularly using brackets. A parametric study examined how damper cross-sections affect displacement, drift, acceleration, and overturning safety. CFRP tendon post-tensioning forces were adjusted to ensure self-centering, with 160 KN per tendon found optimal. The structural response varied with damper cross-section. Unlike fixed-base systems where displacement consistently drops with larger dampers, rocking systems showed mixed trends. A 60×60 mm damper proved optimal for balancing displacement control and performance. Drift behavior followed conventional patterns, decreasing as damper size increased. A 246.7% drift reduction was observed with a 60×40 mm damper during the Kocaeli earthquake, but the 60×60 mm configuration with an MR/MO ratio of 0.93 was overall the most effective, combining stability and energy dissipation. Drift improvements became notable only after a specific damper size threshold, supported by time-history analysis from seven earthquakes. The study also found that the damper arrangement along the wall’s edges significantly affects the overturning safety factor, particularly in rocking systems.

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