Seismic Evaluation of Steel Frames with Dual Linked-Column- Frame under Successive Earthquakes

Articles in Press

Document Type : Original Article

Authors

• Farzaneh Tafreshi ¹
• Elham Rajabi ²
• Yaser Golestani ³

¹ Qualitative and Quantitative Analysis of Fluids and Environmental Research Group, Department of Civil Engineering, Tafresh University, Tafresh 39518-79611, Iran

² Qualitative and Quantitative Analysis of Fluids and Environmental Research Group, Department of Civil Engineering, Tafresh University, Tafresh 39518-79611, Iran.

³ Department of Civil Engineering, Zanjan University Zanjan, Iran.

10.22067/jfcei.2025.90190.1324

Abstract

Since successive shocks occur with short time interval, damage will accumulate in the structures. Recently, linked column frame system (LCF) as a new dual lateral-resisting system, has been introduced in order to manage and reduce the structural damage. In this paper, 4 steel frames equipped by dual LCF and shear/flexure link beams were designed and implemented in Opensees. After nonlinear static and dynamic analysis for single and consecutive earthquakes, parameters such as displacements of the roof and stories, base shear and Park-Ang damage index were investigated. The results showed that successive earthquakes cause more seismic damage to structures than single ones and the frames with the shear link beams have better performance. In general, consecutive earthquakes have an average of 2 to 38% more destructive effects on structures than single earthquakes. Among models, 6 story frames with flexure linked beams are more affected by successive earthquakes than other models. Also, LCF frames with flexure linked beams have more damage index under in successive earthquakes than single shocks. Specifically, the damage index in the lower stories of the 6-story LCF frame with flexure linked beams was 38% higher than the single case.

Keywords

• Dual Linked-Column-Frame system
• Seismic sequence phenomenon
• Nonlinear dynamic analysis
• Structural fuse
• Damage index

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