Updating of an instrumented building model considering amplitude dependence of dynamic resonant properties extracted from seismic response records

Piotr Omenzetter, Faheem Butt

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4 Downloads (Pure)

Abstract

This paper presents system identification and numerical analyses of a three story RC building. System identification was performed using 50 earthquake response records to obtain the frequencies and damping ratios taking into account soil-structure interaction (SSI). Trends in the resonant parameters were correlated with the peak response accelerations at the roof level. A general trend of decreasing resonant frequencies with increasing level of response was observed and quantified, whereas for the damping ratios no clear trends were discernible. A series of finite element models (FEMs) of the building were updated using a sensitivity based method with a Bayesian parameter estimation technique to follow the changes in the resonant frequencies with response amplitude. The FEMs were calibrated by tuning the stiffness of structural and non-structural components (NSCs) and soil. The updated FEMs were used in time history analyses to predict and assess the building seismic performance at the serviceability limit state. It was concluded that the resonant frequencies depend strongly on the response magnitude even for low to moderate levels of shaking. The structural and non-structural components and soil make contributions to the overall building stiffness that depend on the level of shaking. The FEM calibrated to the largest responses was the least conservative in predicting the serviceability limit state inter-story drifts but the building performed satisfactorily.
Original languageEnglish
Pages (from-to)598-620
Number of pages23
JournalStructural Control and Health Monitoring
Volume23
Issue number4
Early online date14 Sep 2015
DOIs
Publication statusPublished - Apr 2016

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Seismic response
Natural frequencies
Identification (control systems)
Damping
Stiffness
Soils
Soil structure interactions
Parameter estimation
Roofs
Earthquakes
Tuning

Keywords

  • instrumented RC building
  • model updating
  • non-structural components
  • seismic monitoring
  • seismic response
  • serviceability limit state
  • soil-structure interaction
  • system identification
  • time history analysis

Cite this

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title = "Updating of an instrumented building model considering amplitude dependence of dynamic resonant properties extracted from seismic response records",
abstract = "This paper presents system identification and numerical analyses of a three story RC building. System identification was performed using 50 earthquake response records to obtain the frequencies and damping ratios taking into account soil-structure interaction (SSI). Trends in the resonant parameters were correlated with the peak response accelerations at the roof level. A general trend of decreasing resonant frequencies with increasing level of response was observed and quantified, whereas for the damping ratios no clear trends were discernible. A series of finite element models (FEMs) of the building were updated using a sensitivity based method with a Bayesian parameter estimation technique to follow the changes in the resonant frequencies with response amplitude. The FEMs were calibrated by tuning the stiffness of structural and non-structural components (NSCs) and soil. The updated FEMs were used in time history analyses to predict and assess the building seismic performance at the serviceability limit state. It was concluded that the resonant frequencies depend strongly on the response magnitude even for low to moderate levels of shaking. The structural and non-structural components and soil make contributions to the overall building stiffness that depend on the level of shaking. The FEM calibrated to the largest responses was the least conservative in predicting the serviceability limit state inter-story drifts but the building performed satisfactorily.",
keywords = "instrumented RC building, model updating, non-structural components, seismic monitoring, seismic response, serviceability limit state, soil-structure interaction, system identification, time history analysis",
author = "Piotr Omenzetter and Faheem Butt",
note = "Acknowledgements The authors would like to express their gratitude to their supporters. Drs Jim Cousins, S.R. Uma and Ken Gledhill facilitated this research by providing access to GeoNet seismic data and structural building information. Piotr Omenzetter's work within the Lloyd's Register Foundation Centre for Safety and Reliability Engineering at the University of Aberdeen is supported by Lloyd's Register Foundation. The Foundation helps to protect life and property by supporting engineering-related education, public engagement and the application of research.",
year = "2016",
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AU - Omenzetter, Piotr

AU - Butt, Faheem

N1 - Acknowledgements The authors would like to express their gratitude to their supporters. Drs Jim Cousins, S.R. Uma and Ken Gledhill facilitated this research by providing access to GeoNet seismic data and structural building information. Piotr Omenzetter's work within the Lloyd's Register Foundation Centre for Safety and Reliability Engineering at the University of Aberdeen is supported by Lloyd's Register Foundation. The Foundation helps to protect life and property by supporting engineering-related education, public engagement and the application of research.

PY - 2016/4

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N2 - This paper presents system identification and numerical analyses of a three story RC building. System identification was performed using 50 earthquake response records to obtain the frequencies and damping ratios taking into account soil-structure interaction (SSI). Trends in the resonant parameters were correlated with the peak response accelerations at the roof level. A general trend of decreasing resonant frequencies with increasing level of response was observed and quantified, whereas for the damping ratios no clear trends were discernible. A series of finite element models (FEMs) of the building were updated using a sensitivity based method with a Bayesian parameter estimation technique to follow the changes in the resonant frequencies with response amplitude. The FEMs were calibrated by tuning the stiffness of structural and non-structural components (NSCs) and soil. The updated FEMs were used in time history analyses to predict and assess the building seismic performance at the serviceability limit state. It was concluded that the resonant frequencies depend strongly on the response magnitude even for low to moderate levels of shaking. The structural and non-structural components and soil make contributions to the overall building stiffness that depend on the level of shaking. The FEM calibrated to the largest responses was the least conservative in predicting the serviceability limit state inter-story drifts but the building performed satisfactorily.

AB - This paper presents system identification and numerical analyses of a three story RC building. System identification was performed using 50 earthquake response records to obtain the frequencies and damping ratios taking into account soil-structure interaction (SSI). Trends in the resonant parameters were correlated with the peak response accelerations at the roof level. A general trend of decreasing resonant frequencies with increasing level of response was observed and quantified, whereas for the damping ratios no clear trends were discernible. A series of finite element models (FEMs) of the building were updated using a sensitivity based method with a Bayesian parameter estimation technique to follow the changes in the resonant frequencies with response amplitude. The FEMs were calibrated by tuning the stiffness of structural and non-structural components (NSCs) and soil. The updated FEMs were used in time history analyses to predict and assess the building seismic performance at the serviceability limit state. It was concluded that the resonant frequencies depend strongly on the response magnitude even for low to moderate levels of shaking. The structural and non-structural components and soil make contributions to the overall building stiffness that depend on the level of shaking. The FEM calibrated to the largest responses was the least conservative in predicting the serviceability limit state inter-story drifts but the building performed satisfactorily.

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KW - seismic monitoring

KW - seismic response

KW - serviceability limit state

KW - soil-structure interaction

KW - system identification

KW - time history analysis

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