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http://dx.doi.org/10.12989/scs.2020.34.6.891

Experimental study on hysteretic behavior of steel moment frame equipped with elliptical brace  

Jouneghani, Habib Ghasemi (Department of Civil Engineering, Faculty of Civil Engineering, Shahid Rajaee Teacher Training University)
Haghollahi, Abbas (Department of Civil Engineering, Faculty of Civil Engineering, Shahid Rajaee Teacher Training University)
Publication Information
Steel and Composite Structures / v.34, no.6, 2020 , pp. 891-907 More about this Journal
Abstract
Many studies reveal that during destructive earthquakes, most of the structures enter the inelastic phase. The amount of hysteretic energy in a structure is considered as an important criterion in structure design and an important indicator for the degree of its damage or vulnerability. The hysteretic energy value wasted after the structure yields is the most important component of the energy equation that affects the structures system damage thereof. Controlling this value of energy leads to controlling the structure behavior. Here, for the first time, the hysteretic behavior and energy dissipation capacity are assessed at presence of elliptical braced resisting frames (ELBRFs), through an experimental study and numerical analysis of FEM. The ELBRFs are of lateral load systems, when located in the middle bay of the frame and connected properly to the beams and columns, in addition to improving the structural behavior, do not have the problem of architectural space in the bracing systems. The energy dissipation capacity is assessed in four frames of small single-story single-bay ELBRFs at ½ scale with different accessories, and compared with SMRF and X-bracing systems. The frames are analyzed through a nonlinear FEM and a quasi-static cyclic loading. The performance features here consist of hysteresis behavior, plasticity factor, energy dissipation, resistance and stiffness variation, shear strength and Von-Mises stress distribution. The test results indicate that the good behavior of the elliptical bracing resisting frame improves strength, stiffness, ductility and dissipated energy capacity in a significant manner.
Keywords
innovative elliptic bracing system; energy dissipation; hysteretic behavior; experimental behavior; seismic performance;
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