Comparison of the behavior of isolated structures mounted on different types of friction isolators subjected to near-field earthquakes

Document Type : Original Article

Authors

1 Assistant Professor, Faculty of Civil Engineering, Yazd University, Yazd, Iran

2 MSc Graduate, University of Science and Arts of Yazd

Abstract

In this study, seismic behavior of isolated structures supported on different types of friction pendulum bearings namely SFP, DCFP and TCFP subjected to seven records of near fault ground motion have been compared. To investigate the results of different isolators, they are designed in a way to have the same effective period and effective damping as two important parameters. Three-dimensional linear models of three, six and nine story steel moment frames supported on nonlinear FPS, DCFP and TCFP isolators are constructed in the SAP2000 software. By performing nonlinear dynamic analysis and investigating various structural responses such as maximum acceleration of the roof, isolators displacement, base shear and drift of the superstructure, it is showed that the isolation with the TCFP bearing are more efficient than isolation with DCFP and FPS ones. The main reason of this good behavior is five-regime backbone curve of this isolator in which the two last stages of the motion have hardening behavior. In addition, the comparison of the performance of the different isolators suggests the superiority of the TCFP bearing in controlling the displacement of the isolator, acceleration of the roof, and drift of the superstructure. The advantages of TCFP isolator are observed in all the studied superstructures with three, six and nine stories.

Keywords

Main Subjects

References

[1] Farzad Naeim, James M. Kelly., (1999). Design of Seismic Isolated Structures from Theory to Practice. John.Wiley & Sons, Inc. 2nd Edition.
[2] Tajammolian, h. (2016). Effect of Near Fault Earthquakes on Torsional Behavior of Isolated Structures Mounted on TCFP Bearing. PhD Dissertation. Amirkabir University of Technology (Tehran Polytechnic).
[3] Loghman, v. (2013). Effect of Vertical Component of Earthquake on Seismic Behavior of Isolated Structures Using TCFP Bearing. MSc Thesis. Amirkabir University of Technology (Tehran Polytechnic).
]4[ Loghman V., Tajammolian H. and Khosnoudian F. (2015). Effects of Rotational Components of Earthquakes on Seismic Responses of Triple Concave Friction Pendulum Base-Isolated Structures, Journal of Vibration and Control, DOI: 10.1177/1077546315594066.
]5[ Fenz, D., Constantinou, M. C. (2008). Mechanical Behavior of Multi-Spherical Sliding Bearings, Technical Report No. MCEER-08/0007, State University of New York at Buffalo, Buffalo. New York, USA.
]6[ Fenz D. , Constantinou M. C. (2008). Triple Friction Pendulum Bearings for Response History Analysis. Earthquake Spectra, Vol. 24, No 4, pp. 1011-1028.
]7[ Fenz D.M. (2008). Development, Implementation and Verificatio of Dynamic Analysis for Multi-Spherical Sliding Bearings, PhD Dissertation, State University of New York at Buffalo, Buffalo, NY, USA.
]8[ Zayas V., Low S. and Mahin S.A. (1987). The FPS Earthquake Resisting System, Rep. No. UCB/EERC-87/01, Earthquake Engineering Research Center, University of California at Berkeley, Berkeley, CA, USA.
]9[ Fadi F. and Constantinou M.C. (2009). of Simplified Methods for Analysis for Structures with Triple Friction Pendulum Isolators. Earthquake Engineering and Structural Dynamics, Vol. 39, pp. 5-22.
]10[ Becker T.C. and Mahin S.A. (2012). Experimental and Analytical Study of the Bi-directional Behavior of the Triple Friction Pendulum Isolator. Earthquake Engineering and Structural Dynamics, Vol. 41, pp. 355-373.
]11[ Fadi F. and Constantinou M.C. (2009). of Simplified Methods for Analysis for Structures with Triple Friction Pendulum Isolators. Earthquake Engineering and Structural Dynamics, Vol. 39, pp. 5-22.
]12[ AISC (2010). Specification for Structural Steel Buildings, ANSI/AISC 360-10, American Institute of Steel Construction, Chicago, Illinois, USA.
]13[ AISC (2010). Seismic Provisions for Structural Steel Buildings, ANSI/AISC 341-10, American Institute of Steel Construction, Chicago, IL, USA.
]14[ ASCE 7-10 (2010). Minimum Design Loads for Building and Other Structures, ASCE/SEI 7-10, American Society of Civil Engineers, Reston, Virginia, USA.
]15[ The Pacific Earthquake Engineering Research Center, http://www.peer.com.
]16[ Computers and Structures Inc. (2010). SAP2000 Software, Version 14.2.4, Computers and Structures Inc., Berkeley, CA, USA.
]17[ Loghman V., Khosnoudian F. and Banazadeh M. (2015). Comparison of seismic behavior of long period SDOF systems mounted on friction isolators under near-field earthquakes. Smart Structures and Systems, Vol. 16(4), pp. 1-23.

Files

History

  • Receive Date: 14 January 2018
  • Revise Date: 05 April 2018
  • Accept Date: 04 May 2018

Share

How to cite

Statistics