DOI QR코드

DOI QR Code

적층식 석탑의 진동 시스템 인식

System Identification for Structural Vibration of Layered Stone Pagoda System

  • 김병화 (경남대학교 토목공학과)
  • 투고 : 2017.05.08
  • 심사 : 2017.07.21
  • 발행 : 2017.09.01

초록

This study proposes a numerical model to explain the closely placed double modes in the vibration of a layered stone pagoda system. The friction surface between the stones is modelled as the Timoshenko finite element while each stone layer is modelled as a rigid body. It is assumed that the irregular asperity on the friction surface enables the stone to be excited. This results in the closely placed modes that are composed of natural modes and self-excited modes. To examine the validity of the proposed model, a set of modal testing and analysis for a layered stone pagoda mock-up model has been conducted and a set of closely placed double modes are extracted. Applying the extended sensitivity-based system identification technique, the various system parameters are identified so that the modal parameters of the proposed numerical model are the same with those of the experimental mock-up. For a horizontal impulse excitation, the simulated acceleration responses are compared with measurements.

키워드

참고문헌

  1. Kim JK. Ryu H. Seismic test of a full-scale model of a five-storey stone pagoda. Earthquake Engng Struct. Dyn. 2003 Jan;32:731-750. https://doi.org/10.1002/eqe.246
  2. Lee S, Park H, Kim S, Lee S. Change of dynamic characteristics of stone masonry structures according to number of layers of granite brick. J. Archit. Inst. Korea. 2001 Jun;17(6):3-10.
  3. Lee SM, Son HW, Lee SG. Stiffness and natural frequency of stone masonry pagoda. J. Korea Inst. Struct. Maint. Insp. 2004 Jul;8(3): 263-270.
  4. Lee SM, Lee KH, Park SW, Suh MC, L ee CH. Computational modelling method by using the natural frequencies of five-story pagoda in Chongnimsa site. J. Korean Assoc. Spat. Struct. 2008 Oct;8(5):67-74.
  5. ITASCA Counsulting Group Inc. Dimensional Distinct Element Code User's Guide. c2003.
  6. Hong SI, Kim HI. Analysis method for masonry stone pagoda using discrete element method. J. Archit. Inst. Korea. 2007 Feb;23(2): 43-50.
  7. Kim HS, Hong SI, Shin HB. Structural characteristic evaluation of stone pagoda structure considering reinforcement types of stylobate and roof stone. J. Archit. Inst. Korea. 2008 Mar;24(3):79-86.
  8. Kim HS, Choi HL, Park YS, Jung SJ, Kim S.M, Bae BS. Structural modelling and analysis of three-story stone pagoda in Goseon-sa temple site considering stylobate types. J. Archit. Inst. Korea. 2009 Dec;25(12):73-80.
  9. Hong SI, Shin HB, Kim DM, Kim HS. Structural behavior evaluation according to roughness of discontinuum surface of stone pagoda. J. Archit. Inst. Korea. 2011 Oct;27(10):63-70.
  10. Kim HS. Dynamic Behavior Characteristic evaluation of stone pagoda structure according to earthquake return period. J. Archit. Inst. Korea. 2013 Jul;29(7):43-50.
  11. Kim HS, Hong SI, Yoo J, Joung HB. Seismic performance evaluation according to construction and configuration types of stone pagoda structure. J. Archit. Inst. Korea. 2016 Sep;32(9):19-50.
  12. Kim BH, Moon DJ, Lee DH. Extracting modal parameters of layered stone pagoda using TDD technique. J. Earthq. Eng. Soc. Korea. 2015 May;19(3):103-108. https://doi.org/10.5000/EESK.2015.19.3.103
  13. Reddy JN. On locking-free shear deformable beam finite elements. Comput. Methods Appl. Mech. Engrg. 1997 Oct;149:113-132. https://doi.org/10.1016/S0045-7825(97)00075-3
  14. Kim BH. Park T. Stubbs N. A new method to extract modal parameters using output-only responses. J. Sound Vib. 2005 Apr;282:215-230. https://doi.org/10.1016/j.jsv.2004.02.026
  15. Kim BH. Lee J. Lee DH. Extracting modal parameters of high-speed railway bridge using the TDD technique. Mech. Syst. Signal Pr. 2010 Apr;24:707-720. https://doi.org/10.1016/j.ymssp.2009.11.010
  16. Stubbs N. A general theory of non-destructive damage detection in structures, in H.H.H. Leipholz (Ed.) Proceedings of the Second International Symposium on Structural Control, University of Waterloo, Ontario, Martinus Nijhoff Publishers, Dordrecht, Netherlands, 1985, p.694-713.
  17. Kim BH. Park T. Estimation o f cable tension force using the frequency-based system identification method. J. Sound Vib. 2007 Jul;304:660-676. https://doi.org/10.1016/j.jsv.2007.03.012

피인용 문헌

  1. Distinct Element Modelling of Stacked Stone Pagoda for Seismic Response Analysis vol.22, pp.6, 2018, https://doi.org/10.5000/EESK.2018.22.6.345