EVALUATION OF BASE-ISOLATOR TYPE DISTRIBUTION IN LOW-RISE BUILDINGS

Authors

Abstract

Seismic base isolation is an earthquake resistant design method that is based on decreasing the seismic demand instead of increasing the seismic capacity. In this paper, the seismic response of base-isolated structures is numerically investigated. The effectiveness of an isolation system depends upon the dynamic characteristics of earthquake ground motion and the building superstructure. In order to evaluate the dynamic response of nonlinear base-isolated structures, different detailed 3D nonlinear analytical models with different characteristics are developed and analyzed under significant and strong motion earthquakes. Also in order to have the optimized behavior of system, different types of isolators including Lead-Rubber Bearing (LRB) and Friction-Pendulum (FPS) isolators were simulated between the superstructure and the foundation so as to provide lateral flexibility and energy dissipation capacity. Providing an optimized arrangement of different types of isolators in the structure is important since it affects the structural responses to earthquakes. The parametric study is concentrated on base shear, accelerations and displacements of isolated models. Also the comparison between hysteretic responses of models as a main criterion for energy dissipation of system has been investigated and evaluated. Results show that the model with FPS ratio of 25% has the best structural response against seismic loads.

Keywords

References

 
[1] Trevor, E. Kelly, S.E. (2001). “Base Isolation of Structures, Design Guidelines”. Holmes Consulting Group Ltd.
[2] Jangid, R.S., Kelly, J.M. (2001). “Base isolation for near-fault motions”. Earthquake Engineering and Structural Dynamics, Vol. 30, No. 5, pp. 691-707.
[3] Taylor, A.W., Igusa, T. (2004). “Primer on seismic isolation”. 1st Ed., American Society of Civil Engineers, Virginia.
[4] AASHTO (1999). “Guide specifications for seismic isolation design”. Washington, D.C.
[5] Dicleli, M. (2002). “Seismic design of lifeline bridge using hybrid seismic isolation”. Journal of Bridge Engineering, Vol. 7, No. 2, pp. 94-103.
[6] IBC. (2000). “International building code”. Falls Church, Virginia.
[7] Naeim, F., Kelly, J. (1996). “Design of seismic isolated structures”. 1st Ed., Wiley, New York.
[8] Almazan, J.L., Inaudi, J.A. (1998). “Modeling aspects of structures isolated with the frictional pendulum system”. Earthquake Engineering and Structural Dynamics, Vol. 27, pp. 845-867.
[9] Kelly, J. (2003). “Tension buckling in multilayer elastomeric bearings”. Journal of Engineering Mechanics, December, pp. 1363-1368.
[10] Ryan, K.L., Chopra, A.K. (2005). “Estimating the seismic response of base-isolated buildings including torsion, rocking and axial-load effects”. Report No. EERC 2005-01, University of California, Berkeley.
[11] Matsagar, V.A., Jangid, R.S. (2004). “Influence of isolator characteristics on the response of base-isolated structures”. Engineering Structures, Vol. 26, pp. 1735-1749.
[12] Ordonez, D., Foti, D., Bozzo, L. (2003). “Comparative study of the inelastic response of base isolated buodings”. Earthquake Engineering and Structural Dynamics, Vol. 32, pp. 151-164.
[13] Skinner, R.I., Robinson, W.H., McVerry, G.H. (1993). “An introduction to seismic isolation”. John Wiley & Sons, New York.
[14] Sharbatdar, M.K., Hoseini Vaez, S.R., Ghodrati Amiri, G., Naderpour, H. (2011). “Seismic Response of Base-Isolated Structures with LRB and FPS Under Near Fault Ground Motions”. Journal of Procedia Engineering, Elsevier, Vol. 14, pp. 3245-3251.
[15] Hoseini Vaez, S.R., Naderpour, H., Fakharian, P. (2012), “Influence of Period Elongation on Dynamic Response of Base-Isolated Buildings having FPS Isolators”. Proceeding of the Second National Conference on Disaster Management, June 19-20, Tehran, Iran.
[16] Almazan, J.L., De la Llera, J.C., (2002). “Analytical model of structures with frictional Pendulum isolators”. Earthquake Engineering and Structural Dynamics, Vol. 31, pp. 305–332.
[17] Tsopelas, P.C., Roussis, P.C., Constantinou, M.C., Buchanan, R., Reinhorn, A.M. (2005). “3D-BASIS-ME-MB, Computer Program for Nonlinear Dynamic Analysis of Seismically Isolated Structures, Manual”.
 
 
Journal of Modeling in Engineering
Volume 14, Issue 44
April 2016
Pages 105-115

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History

  • Receive Date: 28 January 2017
  • Revise Date: 16 September 2017
  • Accept Date: 28 January 2017

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