Advertisement

Evolution of Dynamic Properties of a 5-Story RC Building During Construction

  • Rodrigo Astroza
  • Hamed Ebrahimian
  • Joel P. Conte
  • Tara C. Hutchinson
  • Jose I. Restrepo
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

A full scale five-story reinforced concrete building was built and tested on the NEES-UCSD shake table. The purpose of this experimental program was to study the response of the structure and nonstructural systems and components (NCSs) and their dynamic interaction during seismic excitation of different intensities. The building specimen was tested under base-isolated and fixed-based conditions. Furthermore, as the structure was being built, an accelerometer array was deployed in the specimen to study the evolution of its modal parameters during the construction process and due to placement of major NCSs. A sequence of dynamic tests, including daily ambient vibration tests, impact/free vibration and forced vibration (white noise base excitation) tests, were performed on the structure at different stages of construction. Several state-of-the-art system identification methods, including two output-only (SSI-DATA and NExT-ERA) and one input-output (OKID-ERA), were used to estimate the modal properties of the structure (natural frequencies, damping ratios and mode shapes). The results obtained allow to compare the modal parameters obtained from different methods as well as the performance of these methods and to investigate the effects of the construction process and NCSs on the dynamic properties of the building specimen.

Keywords

System identification Full-scale specimen Shake table tests Non-structural components Construction process 

Notes

Acknowledgements

This project was a collaboration between four academic institutions: The University of California at San Diego, San Diego State University, Howard University, and Worcester Polytechnic Institute, four major funding sources: The National Science Foundation, Englekirk Advisory Board, Charles Pankow Foundation and the California Seismic Safety Commission, and over 40 industry partners. Additional details may be found at bncs.ucsd.edu. Through the NSF-NEESR program, a portion of funding was provided by grant number CMMI-0936505 with Dr. Joy Pauschke as program manager. The above support is gratefully acknowledged. Support of graduate students Consuelo Aranda, Michelle Chen, Elias Espino, Steve Mintz, Elide Pantoli and Xiang Wang, the NEES@UCSD and NEES@UCLA staff, and consulting contributions of Robert Bachman, Chair of the project’s Engineering Regulatory Committee, are greatly appreciated. Design of the test building was led by Englekirk Structural Engineers, and the efforts of Dr. Robert Englekirk and Mahmoud Faghihi are greatly appreciated in this regard. Opinions and findings in this study are those of the authors and do not necessarily reflect the views of the sponsors.

References

  1. 1.
    Brownjohn JMW (2003) Ambient vibration studies for system identification of tall buildings. Earthquake Eng Struct Dyn 32:71–95CrossRefGoogle Scholar
  2. 2.
    Nayeri RD, Masri SF, Ghanem RG, Nigbor RL (2008) A novel approach for the structural identification and monitoring of a full-scale 17-storey building based on ambient vibration measurements. Smart Mat Struct 17(2):1–19CrossRefGoogle Scholar
  3. 3.
    Moaveni B, He X, Conte JP, Restrepo JI, Panagiotou M (2011) System identification study of a seven-story full-scale building slice tested on the UCSD-NEES shake table. ASCE J Struct Eng 137(6):705–717CrossRefGoogle Scholar
  4. 4.
    Nunez T, Boroschek R, Larrain A (2012) Validation of a construction process using a structural health monitoring network. J. Perform. Constr. Facil., 10.1061/(ASCE)CF.1943-5509.0000293Google Scholar
  5. 5.
    Ventura CE, Schuster ND (1996) Structural dynamic properties of a reinforced concrete high-rise building during construction. Can J Civil Eng 23(4):950–972CrossRefGoogle Scholar
  6. 6.
    Nunez T, Boroschek R, Larrain A (2012) Validation of a construction process using a structural health monitoring network. J Perform Constr Facil, 10.1061/(ASCE)CF.1943-5509.0000293Google Scholar
  7. 7.
    Ni YQ, Li B, Lam KH, Zhu DP, Wang Y, Lynch JP, Law KH (2011) In-construction vibration monitoring of a super-tall structure using a long-range wireless sensing system. Smart Struct Syst 7(2):83–102Google Scholar
  8. 8.
    Memari AM, Aghakouchak AA, Ashtiany MG, Tiv M (1999) Full-scale dynamic testing of a steel frame building during construction. Eng Struct 21(11):1115–1127CrossRefGoogle Scholar
  9. 9.
    Butt F, Omenzetter P (2011) Long term seismic response monitoring and finite element modeling of a concrete building considering soil flexibility and non-structural components. In: Proceedings of the SPIE, vol 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, San Diego, CAGoogle Scholar
  10. 10.
    Devin A, Fanning PJ (2012) Impact of nonstructural components on modal response and structural damping. In: XXX International modal analysis conference (IMAC), Jacksonville, FLGoogle Scholar
  11. 11.
    Chen M et al (2012) Design and construction of a full-scale 5-story base isolated building outfitted with nonstructural components for earthquake testing at the UCSD-NEES Facility. In: 43rd structures congress, ASCE, Chicago, ILGoogle Scholar
  12. 12.
    Van Overschee P, De Moor B (1996) Subspace identification for linear systems: theory, implementation, applications. Kluwer Academic Publishers, Dordrecht, The NetherlandsGoogle Scholar
  13. 13.
    James GH, Carne TG, Lauffer JP (1993) The natural excitation technique (NExT) for modal parameter extraction from operating wind turbines. In: SAND92-1666, UC-261, Sandia National Laboratories, SandiaGoogle Scholar
  14. 14.
    Juang JN (1994) Applied system identification. Prentice Hall, Upper Saddle RiverzbMATHGoogle Scholar
  15. 15.
    Ndambi JM, Peeters B, Maeck J, De Visscher J, Wahab MA, Vantomme J, De Roeck G, De Wilde WP (2000) Comparison of techniques for modal analysis of concrete structures. Eng Struct 22(9):1159–1166CrossRefGoogle Scholar
  16. 16.
    Imregun M, Ewins DJ (1993) Realization of complex mode shapes. In: XI international modal analysis conference (IMAC), Kissimmee, FLGoogle Scholar

Copyright information

© The Society for Experimental Mechanics, Inc. 2013

Authors and Affiliations

  • Rodrigo Astroza
    • 1
    • 2
  • Hamed Ebrahimian
    • 1
  • Joel P. Conte
    • 1
  • Tara C. Hutchinson
    • 1
  • Jose I. Restrepo
    • 1
  1. 1.University of CaliforniaSan DiegoUSA
  2. 2.Universidad de Los AndesLAs CondesChile

Personalised recommendations