Document Type : Original Article

Authors

• Fatemeh Tanha Sartakhti ¹
• Mohammad Hossein Adibrad ²

¹ Master's student Department of Civil Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran.

² Assistant Professor Department of Civil Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran

Abstract

During the Northridge and Kobe earthquakes, many rigid beam-to-column connections experienced brittle failure. Therefore, to prevent the brittle failure of connections and protect the main structural members from damage caused by seismic forces, steel slit dampers were utilized at beam-to-column connections. Finite element analyses revealed that when using slit dampers with conventional slit shapes, stress concentration occurs solely at the end points of the struts, and the middle parts play no role in energy dissipation. To address this issue, semi-elliptical slits were employed in the slit damper in this study. Subsequently, the effect of the damper strut width on the seismic performance of beam-to-column connections was investigated. The analysis results indicated that the application of the proposed slit damper enhances the seismic performance of the connection. Furthermore, reducing the distance between the slits increased the participation of the middle parts of the slit damper struts in energy absorption. In the next step, the effect of the slit height distribution on the behavior of the slit damper in beam-to-column connections was examined. The results of analyzing the models in the finite element software demonstrated that distributing the strut heights in the slit damper with a semi-elliptical slit shape at a 2-degree slope—such that the minimum strut height is located at the corners and the maximum strut height is in the middle—results in a better stress distribution across the damper surface and increases energy dissipation.

Keywords

• Earthquake
• Slit damper
• Semi-elliptical slit
• Strut width
• Strut height distribution

Main Subjects

• structure