Evaluation of eccentrically braced frames without diagonal members

Document Type : Research Article

Author

Amirkabir university of technology

Abstract

Eccentrically braced frames are one type of lateral load bearing systems due to their acceptable ductility and proportional stiffness. However, they have some limitations that need improvement. One limitation is insufficient architectural space creation especially for short spans which leads to using link beams with medium and long lengths that have weaker energy absorption compared to links with short lengths. Another limitation is their costly and time-consuming replacement. To address these limitations, this research proposes removing diagonal elements from eccentrically braced frames and increasing beam depth outside links which provides more proportional stiffness and improved architectural space for designers. Additionally, using replaceable connections between links and main beams reduces repair costs after earthquakes. Numerical modeling was used to investigate this idea along with laboratory studies. The ratio between increased beam depth outside links and frame stiffness was found through numerical modeling samples with gradual increases in beam depth without braces. Finally, a relationship between increased beam depth outside links and increased frame stiffness was proposed to improve energy absorption amount and system ductility.

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Amirkabir Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 04 July 2024

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