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Earthquakes and Structures
  Volume 7, Number 6, December 2014, pages 1159-1282
DOI: http://dx.doi.org/10.12989/eas.2014.7.6.1159
 


The effects of peak ground velocity of near-field ground motions on the seismic responses of base-isolated structures mounted on friction bearings
H.Tajammolian, F.Khoshnoudian, S.Talaei and V.Loghman

 
Abstract
    This research has been conducted in order to investigate the effects of peak ground velocity (PGV) of near-field earthquakes on base-isolated structures mounted on Single Friction Pendulum (SFP), Double Concave Friction Pendulum (DCFP) and Triple Concave Friction Pendulum (TCFP) bearings. Seismic responses of base-isolated structures subjected to simplified near field pulses including the forward directivity and the fling step pulses are considered in this study. Behaviour of a two dimensional single story structure mounting on SFP, DCFP and TCFP isolators investigated employing a variety range of isolators and the velocity (PGV) of the forward directivity and the fling step pulses as the main variables of the near field earthquakes. The maximum isolator displacement and base shear are selected as main seismic responses. Peak seismic responses of different isolator types are compared to emphasize the efficiency of each one under near field earthquakes. It is demonstrated that rising the PGVs increases the isolator displacement and base shear of structure. The effects of the forward directivity are greater than the fling step pulses. Furthermore, TCFP isolator is more effective to control the near field effects than the other friction pendulum isolators are. This efficiency is more significant in pulses with longer period and greater PGVs.
 
Key Words
    near field ground motions; simplified pulse models; seismic isolation; friction Isolators
 
Address
H.Tajammolian: Structural Engineering, Structural Engineering, Faculty of Civil Engineering, Amirkabir University of Technology, Tehran, Iran

F.Khoshnoudian: Faculty of Civil Engineering, Amirkabir University of Technology, Tehran, Iran

S.Talaei and V.Loghman: Earthquake Engineering, Faculty of Civil Engineering, Amirkabir University of Technology, Tehran, Iran
 

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