Investigating the effects of using a rocking motion system on the bending seismic Behavior of special steel frames
Subject Areas : Analysis of Structure and Earthquake
Ali Parvari
1
,
S.Behnam Beheshti
2
1 - Assistant Professor, Department of Civil Engineering, Khomein Branch, Islamic Azad University, Khomein, Iran
2 - PhD Student in Structural Engineering, Faculty of Civil Engineering , khomein Branch, Islamic Azad
University, khomein, Iran
Keywords: Nonlinear Dynamic Analysis, Seismic Improvement, Rocking Motion, viscous damping, special steel moment frame,
Abstract :
Today, the need to design and implement structures with less vulnerability and damage, and easier repair after an earthquake is essential. Traditional seismically resistant lateral systems can cause serious damage to the structural system and the relative displacements remaining in the structure make it very difficult and uneconomical to repair the structure after an earthquake. The utilize of rocking motion in the structure causes the destruction of destructive seismic effects including energy dissipation and improves the seismic behaviour. In this research, in order to investigate the effects of the rocking motion system on the seismic response of short and tall regular steel buildings, a five- and ten-story steel frames with special moment frame lateral bearing system according to the fourth edition of Standard 2800 and the latest editions of the sixth and tenth national building regulations are designed by Perform3D software. Seven earthquake records were selected and then these records were based on ASCE regulations scaled according to the spectrum of the 2800. By using nonlinear time history analysis, the seismic response of the studied building has been investigated in conditions with and without using a rocking motion system. The results of studies such as base shear, Relative displacement of floors, energy dissipation and lateral and vertical accelerations of the roof indicate that the use of rocking motion system in short and tall steel buildings can significantly improve the seismic response of the structure.
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