Evaluation of seismic performance of steel frames with Y-shape braces under far-field and near-field earthquakes
نویسندگان
1 Assistant professor, Civil Engineering Department, Technical University of Buein Zahra, Buein Zahra, Qazvin, Iran
2 PhD Student, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
3 PhD Student, Department of Civil Engineering, Shahrkurd Branch, Islamic Azad University, Shahrkurd, Iran.
4 PhD Student, Department of Earthquake Engineering, Tarbiat Modares University, Tehran, Iran
doi
10.61186/NMCE.2505.1088چکیده
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 analysis 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%.
