Evaluating the Effect of Using Lead Rubber Seismic Isolator System and Friction Pendulum System with Different Periods in Improving the Seismic Behavior of Steel Framed Buildings

Document Type : Original Article

Author

Associate professor, Department of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

Abstract

Abstract



In the present study, the evaluation of the seismic performance of steel framed buildings on two types of seismic isolation systems under far-fault earthquakes has been investigated. The isolator used are lead rubber bearing and single arc friction pendulum system. In order to compare the behavior of these isolators, the effective time period is considered as one of the most important properties of the isolator. The effective time period of the isolators is 2.5, 3.5 and 4.5. Three types of steel framed buildings with special moment resistant steel frames of 3, 7 and 12 stories are placed on these isolators. These three buildings represent low-rise, mid-rise and high-rise buildings. The effect of these two types of seismic isolators has been investigated in reducing the acceleration response and the relative displacement(drift) of the floors. The results show that the efficiency of both types of lead rubber bearing and single arc friction pendulum system decreases with the increase in the height of the building. The efficiency of the single arc friction pendulum system is 14% lower than that of the lead rubber bearing. Increasing the target natural period (decreasing the stiffness of the isolator) in reducing the response of the buildings in the lead rubber bearing has an average of 27% better performance than the single arc friction pendulum system.

Keywords

Main Subjects

References

  1. Gkournelos, P.D., Triantafillou, T.C., Bournas, D.A.: Seismic upgrading of existing reinforced concrete buildings: A state-of-the-art review. Eng. Struct. 240, 112273 (2021). https://doi.org/10.1016/j.engstruct.2021.112273
  2. Cheng, F.Y., Jiang, H., Lou, K.: Base Isolation Systems. In: Smart structures : innovative systems for seismic response control. pp. 51–110. CRC Press : Taylor & Francis Group, Boca Raton; London; New York (2008)
  3. Mayes, R.L.: Design of Structures with Seismic Isolation. In: Naeim, F. (ed.) The Seismic Design Handbook. pp. 723–755. Springer US, Boston, MA (2001)
  4. Cavdar, E., Ozdemir, G.: Amplification in maximum isolator displacement of an LRB isolated building due to mass eccentricity. Bull. Earthq. Eng. 20, 607–631 (2022). https://doi.org/10.1007/s10518-021-01247-1
  5. Vibhute, A.S., Bharti, S.D., Shrimali, M.K., Datta, T.K.: Performance evaluation of FPS and LRB isolated frames under main and aftershocks of an earthquake. Structures. 44, 1532–1545 (2022). https://doi.org/https://doi.org/10.1016/j.istruc.2022.08.082
  6. Ozer, E., Inel, M., Cayci, B.T.: Seismic behavior of LRB and FPS type isolators considering torsional effects. Structures. 37, 267–283 (2022). https://doi.org/10.1016/j.istruc.2022.01.011
  7. Castaldo, P., Palazzo, B., Alfano, G., Palumbo, M.F.: Seismic reliability-based ductility demand for hardening and softening structures isolated by friction pendulum bearings. Struct. Control Heal. Monit. 25, e2256 (2018). https://doi.org/10.1002/stc.2256
  8. Pokhrel, A., Li, J.C., Li, Y.C., Maksis, N., Yu, Y.: Comparative Studies of Base Isolation Systems Featured with Lead Rubber Bearings and Friction Pendulum Bearings. Appl. Mech. Mater. 846, 114–119 (2016). https://doi.org/10.4028/www.scientific.net/AMM.846.114
  9. Komur, M.A.: Soft-Story Effects on the Behavior of Fixed-Base and LRB Base-Isolated Reinforced Concrete Buildings. Arab. J. Sci. Eng. 41, 381–391 (2016). https://doi.org/10.1007/s13369-015-1664-3
  10. Jangid, R.S.: Optimum friction pendulum system for near-fault motions. Eng. Struct. 27, 349–359 (2005). https://doi.org/10.1016/j.engstruct.2004.09.013
  11. Cheng, F.Y., Jiang, H., Lou, K.: Basic Concept of SmartStructure Systems. In: Smart structures : innovative systems for seismic response control. pp. 1–50. , Boca Raton; London; New York (2008)
  12. Naeim, F., Kelly, J.M.: Isolation System Components. In: Design of Seismic Isolated Structures: From Theory to Practice. pp. 47–62. John Wiley & Sons, Inc., Hoboken, NJ, USA (1999)
  13. Jain, M., Sanghai, S.S.: A Review: On Base Isolation System. Int. J. Sci. Adv. Res. Technol. 3, 326–330 (2017)
  14. Zordan, T., Liu, T., Briseghella, B., Zhang, Q.: Improved equivalent viscous damping model for base-isolated structures with lead rubber bearings. Eng. Struct. 75, 340–352 (2014). https://doi.org/10.1016/j.engstruct.2014.05.044
  15. Federal Emergency Management Agency (FEMA): NEHRP Guidelines for the Seismic Rehabilitation ofBuildings and NEHER Commentary on the Guidelines for the Seismic Rehabilitation ofBuildings, (1997)
  16. Tyler, R.G., Robinson, W.H.: High-strain tests on lead-rubber bearings for earthquake loadings. Bull. New Zeal. Soc. Earthq. Eng. 17, 90–105 (1984). https://doi.org/10.5459/bnzsee.17.2.90-105
  17. Robinson, W.H., Greenbank, L.R.: An extrusion energy absorber suitable for the protection of structures during an earthquake. Earthq. Eng. Struct. Dyn. 4, 251–259 (1976). https://doi.org/10.1002/eqe.4290040306
  18. Li, M., Yang, J., Liang, S., Hou, H., Hu, J.: Review on clean recovery of discarded / spent lead-acid battery and trends of recycled products. J. Power Sources. 436, 226853 (2019). https://doi.org/10.1016/j.jpowsour.2019.226853
  19. ASCE/SEI 7-10.: “Minimum Design Loads and Associated Criteria for Buildings and Other Structures.” American Society of Civil Engineers, Reston, Virginia (2010)
  20. NEHRP Consultants Joint Venture: Evaluation of the FEMA P-695 Methodology for Quantification of Building Seismic Performance Factors (NIST GCR 10-917-8). Natl. Inst. Stand. Technol. (2010)
  21. Federal Emergency Management Agency (FEMA): “Prestandard and Commentary for the Seismic Rehabilitation of Buildings(FEMA 356).” Federal Emergency Management Agency, Washington, D.C. (2000)

Files

History

  • Receive Date: 20 January 2023
  • Revise Date: 07 April 2023
  • Accept Date: 16 April 2023

Share

How to cite

Statistics