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Earthquakes and Structures
  Volume 8, Number 3, March 2015, pages 699-712

Evaluating the performance of OBS-C-O in steel frames under monotonic load
Mohammad Bazzaz, Zahra Andalib, Mohammad Ali Kafi and Ali Kheyroddin

    Bracing structures with off-centre bracing system is one of the new resistant systems that frequently used in the frame with pin connections. High ductility, high-energy dissipation and decrease of base shear are advantages of this bracing system. However, beside these advantages, reconstruction and hard repair of off-centre bracing system cause inappropriate performance in the earthquake. Therefore, in this paper, the goal is investigating the behavior of this type of bracing system with ductile element (circular dissipater), in order to providing replacement of damaged member without needing repair or reconstruction of the general system. To achieve this purpose, some numerical studies have been performed using ANSYS software, a frame with off-centre bracing system and optimum eccentricity (OBS-C-O) and another frame with the same identifications without ductile element (OBS) has been created. In order to investigate precisely on the optimum placement of circular elements under monotonic load again three steal frames were modeled. Furthermore, the behavior of this general system investigated for the first time, linear and nonlinear behavior of these two steel frames compared to each other, to achieve the benefit of using the circular element in an off-centre bracing system. Eventually, the analytical results revealed that the performance of steel ring at the end of off-centre braces system illustrating as a first defensive line and buckling fuse in the off-centre bracing system.
Key Words
    finite elements; structural control; braces; dampers; ductility factor; energy dissipation; steel structure
Mohammad Bazzaz, Zahra Andalib, Mohammad Ali Kafi and Ali Kheyroddin: Faculty of Civil Engineering, Semnan University, Semnan, Iran

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