Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation of Seismic Design Parameters for Nonstructural Components Based on Coupled Structure-Nonstructural 2-DOF System Analysis

구조물-비구조요소 2자유도 결합시스템 해석을 통한 비구조요소 내진설계변수 평가

  • Bae, Chang Jun (Department of Architecture, Seoul National University) ;
  • Lee, Cheol-Ho (Department of Architecture, Seoul National University) ;
  • Jun, Su-Chan (Department of Architecture, Seoul National University)
  • Received : 2022.01.24
  • Accepted : 2022.02.24
  • Published : 2022.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

Seismic demand on nonstructural components (NSCs) is highly dependent on the coupled behavior of a combined supporting structure-NSC system. Because of the inherent complexities of the problem, many of the affecting factors are inevitably neglected or simplified based on engineering judgments in current seismic design codes. However, a systematic analysis of the key affecting factors should establish reasonable seismic design provisions for NSCs. In this study, an idealized 2-DOF model simulating the coupled structure-NSC system was constructed to analyze the parameters that affect the response of NSCs comprehensively. The analyses were conducted to evaluate the effects of structure-NSC mass ratio, structure, and NSC nonlinearities on the peak component acceleration. Also, the appropriateness of component ductility factor (Rp) given by current codes was discussed based on the required ductility capacity of NSCs. It was observed that the responses of NSCs on the coupled system were significantly affected by the mass ratio, resulting in lower accelerations than the floor spectrum-based response, which neglected the interaction effects. Also, the component amplification factor (ap) in current provisions tended to underestimate the dynamic amplification of NSCs with a mass ratio of less than 15%. The nonlinearity of NSCs decreased the component responses. In some cases, the code-specified Rp caused nonlinear deformation far beyond the ductility capacity of NSCs, and a practically unacceptable level of ductility was required for short-period NSCs to achieve the assigned amount of response reduction.

Keywords

Acknowledgement

이 논문은 2021년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2021R1A2C2009834)

References

  1. Applied Technology Council. Reducing the Risks of Nonstructural Earthquake Damage - A Practical Guide. Washington, D.C.: Federal Emergency Management Agency (US); 2011 Jan. FEMA E-74.
  2. Lee CH, Jun SC. Review of Equivalent Static and Dynamic Methods for Seismic Design of Non-Structural Components. Magazine of the Korea Society of Steel Construction. 2020 Feb;32(1):8-16.
  3. Korea Construction Standard Center. Seismic Building Design Code (KDS 41 17 00). c2019.
  4. American Society of Civil Engineers. Minimum Design Loads and Associated Criteria for Buildings and Other Structures (ASCE/SEI 7-16). Reston. c2017.
  5. Jun SC, Lee CH, Bae CJ, Kim SY. Evaluation of equivalent-static floor acceleration for seismic design of non-structural elements. Journal of the Architectural Institute of Korea Structure & Construction. 2020 Mar;36(3):121-128.
  6. Choi IS, Lee JH, Sohn JH, Kim JH. Investigation on Seismic Design Component and Load for Nonstructural Element. Journal of the Architectural Institute of Korea Structure & Construction. 2019 May;35(5):117-124. https://doi.org/10.5659/JAIK_SC.2019.35.5.117
  7. Anajafi H, Medina R.A. Evaluation of ASCE 7 equations for designing acceleration-sensitive nonstructural components using data from instrumented buildings. Earthquake Engng Struct Dyn. 2018 Apr;47(4):1075-1094. https://doi.org/10.1002/eqe.3006
  8. Miranda E, Kazantzi A, Vanvatsikos D. Towards a new approach to design acceleration-sensitive non-structural components. Proceedings of the 11th U.S. National Conference on Earthquake Engineering; 2018 Jun 25-29; Earthquake Engineering Research Institute; c2017.
  9. Petrone C, Magliulo G, Manfredi G. Seismic demand on light acceleration-sensitive nonstructural components in European reinforced concrete buildings. Earthquake Engng Struct Dyn. 2015 Jul;44(8):1203-1217. https://doi.org/10.1002/eqe.2508
  10. Singh MP, Moreschi LM, Suarez LE, Matheu EE. Seismic design forces. I: rigid nonstructural components. Journal of Structural Engineering (ASCE). 2006 Oct;132(10):1524-1532. https://doi.org/10.1061/(asce)0733-9445(2006)132:10(1524)
  11. Singh MP, Moreschi LM, Suarez LE, Matheu EE. Seismic design forces. II: Flexible nonstructural components. Journal of Structural Engineering (ASCE). 2006 Oct;132(10):1533-1542. https://doi.org/10.1061/(asce)0733-9445(2006)132:10(1533)
  12. Calvi PM, Sullivan TJ. Estimating floor spectra in multiple degree of freedom systems. Earthquakes and Structures. 2014 Jul;7(1):17-38. Available from: https://doi.org/10.12989/EAS.2014.7.1.017
  13. Wieser J, Pekcan G, Zaghi AE, Itani A, Maragakis M. Floor Accelerations in Yielding Special Moment Resisting Frame Structures. Earthquake Spectra. 2013 Aug;29(3):987-1002. https://doi.org/10.1193/1.4000167
  14. Suarez, LE, Singh, MP. Floor response spectra with structure-equipment interaction effects by a mode synthesis approach. Earthquake Engng Struct Dyn. 1987 Feb;15(2):141-158. https://doi.org/10.1002/eqe.4290150202
  15. Gupta VK. Acceleration transfer function of secondary systems. Journal of Engineering Mechanics (ASCE). 1997 Jul;123(7):678-685. https://doi.org/10.1061/(ASCE)0733-9399(1997)123:7(678)
  16. Lin J, Mahin SA. Seismic Response of Light Subsystems on Inelastic Structures. Journal of Structural Engineering (ASCE). 1985 Feb;111(2):400-417. https://doi.org/10.1061/(ASCE)0733-9445(1985)111:2(400)
  17. Lima C, Martinelli E. Seismic Response of Acceleration-Sensitive Non-Structural Components in Buildings. Buildings. 2019;9(1):7. https://doi.org/10.3390/buildings9010007
  18. Adam C, FurtmFller T. Seismic response characteristics of nonstructural elements attached to inelastic buildings. Proceedings of 7th European Conference on Structural Dynamics; 2008 Jul 7-9; University of Southampton, Southampton, UK (Brennan, M.J., ed.), CD-ROM paper, paper no. 120, 12 p.
  19. Villarverde R. Simple method to estimate the seismic nonlinear response of nonstructural components in buildings. Engng Structures. 2006 Jul;28(8):1209-1221. https://doi.org/10.1016/j.engstruct.2005.11.016
  20. Newmark NM, Hall WJ. Earthquake Spectra and Design. Earthquake Engineering Research Institute, Berkeley, California; c1982. 103p.
  21. Chopra AK. Dynamics of Structures. 4th ed. Prentice Hall. c2014.
  22. Gupta A, Krawinkler H. . Seismic demands for performance evaluation of steel moment resisting frame structures. Department of Civil and Environmental Engineering, Stanford University (US); 1999 Jun. Report No. 132.
  23. Sankaranarayanan R, Medina RA. Acceleration response modification factors for nonstructural components attached to inelastic moment-resisting frame structures. Earthquake Engng Struct. Dyn. 2007 Nov;36(14):2189-2210 https://doi.org/10.1002/eqe.724
  24. Anajafi H, Medina RA. Damping modification factor for elastic floor response spectra. Bull Earthquake Eng. 2019 Jul;17:6079-6108. https://doi.org/10.1007/s10518-019-00684-3
  25. Anajafi H, Medina RA, Santini-Bell E. Inelastic floor response spectra for designing anchored acceleration-sensitive nonstructural components. Bull Earthquake Eng. 2020 Mar;18:2115-2147 https://doi.org/10.1007/s10518-019-00760-8
  26. Watkins DA, Chiu L, Hutchinson TC, Hoehler MS. Survey and characterization of floor and wall mounted mechanical and electrical equipment in buildings. Department of Structural Engineering, University of California, San Diego (US); 2009 Nov. Rep. No. SSRP-2009/11.
  27. Applied Technology Council(ATC). Seimic Evaluation and Retrofit of Concrete Buildings. Redwood City, California (US); Report ATC-40. 1996 Nov.
  28. Applied Technology Council(ATC). Seismic Analysis, Design, and Installation of Nonstructural Components and Systems-Background and Recommendations for Future Work. Gaithersburg (MD): National Institute of Standards and Technology (US); Report NIST GCR 17-917-44. c2017.