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Smart Structures and Systems Volume 27, Number 3, March 2021 , pages 467-478 DOI: https://doi.org/10.12989/sss.2021.27.3.467 |
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Seismic behavior of a two-level control system with double vertical shear links in series |
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Mohsen Zare Golmoghany and Seyed Mehdi Zahrai
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| Abstract | ||
| To improve seismic behavior of structures, a two-level control system is proposed in this paper where by combining two vertical shear panels in series in a chevron bracing configuration, Double-Vertical Shear Panel, D-VSP is introduced. Utilizing two-levels of energy absorption for two different earthquake intensity levels, D-VSP is expected to beneficially change dynamic behavior parameters like strength, stiffness and damping ratio through increasing ductility. To validate research, a VSP is modeled in ABAQUS and related numerical results are compared to those of a previous experimental work. Pushover, quasistatic cyclic and seismic analyses are conducted on two models. The hysteresis curves show symmetric two-level behavior with stable strength and stiffness leading to increase ductility ratio up to 29.4%. Maximum displacement and maximum base shear under seismic loading decrease 5.91 and 11.18% respectively under moderate earthquakes when D-VSP system uses only first fuse, saving second fuse for severe earthquakes. However, in a strong earthquake, both of the shear panels absorb seismic energy and can control vibration better than conventional systems with one level control mechanism. The proposed system using a weaker panel can better control an extensive range of earthquakes as well as the earthquake with foreshocks. | ||
| Key Words | ||
| Chevron bracing; cyclic behavior; energy dissipation; vertical shear link; two-level control system; seismic response | ||
| Address | ||
| (1) Mohsen Zare Golmoghany, Seyed Mehdi Zahrai: School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran; (2) Seyed Mehdi Zahrai: Department of Civil Engineering, University of Ottawa, Canada. | ||