Numerical study of arch corner brace segments in simple steel frames to provide seismic resisting system

Document Type : Research Article

Authors

1 Graduate student, School of Civil Engineering, The University of Tehran, Tehran, Iran

2 School of Civil Engineering, the University of Tehran

Abstract

Braced and rigid frames are the most typical systems that are used to resist lateral loads. Typical braced frames, in comparison with rigid frames, have higher stiffness they have low ductility. On the other hand, rigid frames have high ductility but due to their low lateral stiffness, they maintain large displacements throughout the earthquake, which is not favorable. Furthermore, in rigid frames, the beam to column connection is a critical area that often experiences damage during the earthquake. In this research, the objective is to create a lateral load-carrying system and improve the seismic performance of steel frames using the placement of arch segments cut of steel plates at the corner of simple steel frames and they are yielding. Due to the eccentricity, these components are subjected to an interaction of axial and flexural forces and like yielding dampers absorb the major part of the input energy. In this study, first, the hysteresis curve of arch segments made by ST37 steel was achieved using finite element software, ABAQUS.  Then this damper was modeled in SAP software to create the same hysteresis curve. Then, 3, 6, and 9-story bare rigid frames and simple frames with arch segments were modeled and subjected to time-history analysis of 12 different earthquakes. Based on achieved results, maximum roof displacement and maximum story drifts of frames, in simple frames with arch segments compared to bare rigid frames in average reduced 22 and 8%, respectively. Also in simple frames with arch segments on average 46% of input energy was absorbed by arch segments that indicate the relatively good performance of this system.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 2
May 2021
Pages 687-706

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