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Title
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Evaluation of seismic performance of steel frames with Y-shape braces under far-field and near-field earthquakes
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Type
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JournalPaper
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Keywords
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Nonlinear dynamic analysis, Y-shape bracing, near-field and far-field Earthquake, Nonlinear dissipated energy, Plastic hinge
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Abstract
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In this study, the finite element modeling of the Y-shape bracing system is initially developed and verified. Next, the seismic performance of steel frames with Y-shape braces under far-field and near-field earthquakes was evaluated. For this purpose, seismic anal ysis was performed using 12 seismic records including near-field and far-field on 4, 8, and 12-floor structures equipped with and without Y-shape bracing. A series of time history analyses were performed on the samples, which led to the precise review of the Y-shape bracing system. The results show that structures equipped with Y-shape braces have less lateral displacement and also less number and level of plastic hinges; and, the level of non-linear dissipated energy is higher in those structures. Also, the plastic hinges based on the failure indices of the structures indicate that -near-field earthquakes have a more destructive effect of about 20% higher than far earthquakes on structures equipped with Y-shape bracing. Y-shaped bracing has reduced the permanent displacement in the system by up to 30%.
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Researchers
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Hadi Aboutalebi (Fourth Researcher), Kaveh Saboohian (Third Researcher), Shahin Borzoo (Second Researcher), Saeed Najafi (First Researcher)
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