Energy Dissipation Improvement in CBFs Using Perforated Gusset Plates

Document Type : Research Article

Authors

1 Ph.D. Candidate, Department of Civil Engineering, Islamic Azad University (Arak Branch)

2 Professor, Center of Excellence for Engineering and Management of Civil Infrastructures, School of Civil Engineering, University of Tehran

Abstract

Concentrically Braced Frames, CBFs, are the common systems to provide lateral stiffness and strength
in buildings that in comparison with other systems such as moment resisting frames and eccentrically
brace frames have less seismic energy dissipation and their ductility. This defect caused many studies
in the recent years to improve ductility and seismic performance. In this paper, by making hole in the
middle or end gusset plates on diagonal and X-brace samples through doing nonlinear static analysis
with ABAQUS software, it was tried to provide more ductility and to improve the seismic performance
of the brace. This performance is based on the brace buckling prevention. Therefore, holes should be
designed in such a way that have less axial capacity than brace critical buckling load to help earthquake
energy dissipation. Hysteresis curves show ductile behavior enhancing energy dissipation during cyclic
loading of the final specimens and postponing the occurrence of buckling in the brace members until
displacement about 2 cm while normal braces buckle in 1 cm displacement. The reduction of frame
stiffness approximately 8-57% and 12-17% increment of equivalent damping prove more ductility and
better seismic behavior of the proposed system.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 48, Issue 3
November 2016
Pages 339-349

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