ICASGE'23
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Near-field earthquake performance of eccentrically braced steel frames with supplemental fluid viscous dampers
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Volume Title: ICASGE2023
Authors
1Civil Engineering Department, Faculty of Engineering, Delta University for Science and Technology, Egypt
2Structural Engineering Department, Faculty of Engineering, Tanta University, Tanta, Egypt
Abstract
Eccentrically braced frames have been widely recognized as one of the efficient earthquake-resisting systems. Their most critical component is the horizontal shear link that connects the brace with the column. The braces are acted upon by significant axial forces which can be exploited to participate in dissipating seismic energy by replacing them with another passive energy dissipation device. So, in this paper, the seismic performance of eccentrically braced frames with horizontal shear links and fluid viscous dampers (FVDs) is evaluated. Firstly, an available analytical model for shear links was validated in Ansys Workbench to confirm its capability of predicting the hysteretic response of horizontal shear links. Then, that analytical model was employed in ETABS to model the horizontal shear links in a six-story building that had four different configurations; the first was with concentric braces, the second included diagonal FVDs, the third included conventional eccentric braces along with the horizontal shear links, while the fourth combined both FVDs and horizontal shear links. A modal analysis was carried out to evaluate the fundamental periods of the buildings. Moreover, nonlinear static pushover and time history analyses were conducted wherein the buildings were subjected to a near-field earthquake ground motion characterized with high frequencies and large amplitude velocity pulses. The performance levels, stiffness, load- carrying capacity, energy dissipation capacity, and stories response were all compared. The results revealed that replacing conventional braces with fluid viscous dampers reduced story displacements and interstory drifts. Meanwhile, the amount of dissipated seismic energy significantly increased.
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