Finite element model updating of a RC building considering seismic response trends

F. Butt, P. Omenzetter

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Abstract

This paper presents a study on the seismic response trends evaluation and finite element model updating of a reinforced concrete building monitored for a period of more than two years. The three story reinforced concrete building is instrumented with five tri-axial accelerometers and a free-field tri-axial accelerometer. The time domain N4SID system identification technique was used to obtain the frequencies and damping ratios considering flexible base models taking into account the soil-structure-interaction using 50 earthquakes. Trends of variation of seismic response were developed by correlating the peak response acceleration at the roof level with identified frequencies and damping ratios. A general trend of decreasing frequencies was observed with increased level of shaking. To simulate the varying behavior of the building with response levels, a series of three dimensional finite element models were calibrated considering several points on the developed frequency-response amplitude trend lines as targets for updating. To incorporate real in-situ conditions, soil underneath the foundation and around the building was modeled using spring elements and nonstructural components (claddings and partitions) were also included. Sensitivity based model updating technique was applied taking into account concrete, soil and cladding stiffness as updating parameters. It was concluded from the investigation that knowledge of the variation of seismic response of buildings is necessary to better understand their behavior during earthquakes, and also that the participation of soil and non-structural components is significant towards the seismic response of the building and these should be considered in models to simulate the real behavior.
Original languageEnglish
Title of host publicationProceedings SPIE 8694
Subtitle of host publicationNondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013
EditorsTzu Yang Yu, Andrew L. Gyekenyesi, Peter J. Shull, Aaron A. Diaz, H. Felix Wu, A. Emin Aktan
PublisherSPIE
Pages1–13
Number of pages13
Volume8694
ISBN (Electronic)9780819494771
DOIs
Publication statusPublished - 16 Apr 2013
EventSPIE 20th Annual International Symposium on Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring - Town & Country Resort and Convention Center, San Diego, United States
Duration: 10 Mar 201314 Mar 2013

Publication series

NameSPIE Proceedings
PublisherSPIE
Volume8694
ISSN (Electronic)0277-786X

Conference

ConferenceSPIE 20th Annual International Symposium on Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring
CountryUnited States
CitySan Diego
Period10/03/1314/03/13

Keywords

  • Instrumented RC building
  • structural health monitoring
  • seismic response
  • system identification
  • model updating
  • soil-structure-interaction

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  • Cite this

    Butt, F., & Omenzetter, P. (2013). Finite element model updating of a RC building considering seismic response trends. In T. Y. Yu, A. L. Gyekenyesi, P. J. Shull, A. A. Diaz, H. F. Wu, & A. E. Aktan (Eds.), Proceedings SPIE 8694: Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2013 (Vol. 8694, pp. 1–13). [86941E] (SPIE Proceedings; Vol. 8694). SPIE. https://doi.org/10.1117/12.2008940