Evaluation of the Seismic Performance of Rocking Motions and its Effects on the Controlling Provisions of Special Steel Moment-resisting Systems Dual with CBF Bracing
Subject Areas : Analysis of Structure and Earthquake
Ali
Parvari
1
(Islamic Azad University, Khomeyn)
Ehsan
Azizi
2
(Khomein azad university)
Keywords: seismic performance, near-field earthquake, special concentrically braced frame, Self-centering motion,
Abstract :
In this study, 4-, 8-, and 12-Story steel special concentrically braced frame (SCBFs) structures were considered in area with high seismically hazard and soil type II according to Iranian's 2800 code provision. Structures are residential use and have regularity in plane and vertical distribution. Structures were modeled using Sap 2000 software to investigate the effect of self-centering ‎motion under seven near-field earthquakes. All models assumed with and without dual system controlling provisions. The results of this research indicate that without dual system provisions, considering the self-centering ‎motion in ‎4-, 8-, and 12-Story SCBFs‎ reduces base shear of structures in contrast with increasing deformation of top floor and column axial force. In average, the self-centering ‎motion‎ dissipate energy more than fixed base one. With controlling dual system provisions, considering the self-centering ‎motion in ‎4-, 8-, and 12-Story ‎SCBFs‎ reduces base shear of structures, whereas increases deformation of top floor ‎and column axial force. Moreover, in this case of study, energy dissipation are more than with controlling ‎one. Considering the self-centering ‎motion in ‎8-, and 12-Story ‎SCBFs‎ reduces base shear of ‎structures and top floor deformations, meanwhile column axial force‎ was increased. It can be seen that in ‎4-, and 12-Story ‎SCBFs considering code provisions had a better results, whereas in ‎8-Story ‎SCBFs ‎neglecting code provisions was accepted.
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