Seismic response trends evaluation and finite element model calibration of an instrumented RC building considering soil-structure interaction and non-structural components

Faheem Butt, Piotr Omenzetter*

*Corresponding author for this work

Research output: Contribution to journalArticle

24 Citations (Scopus)
5 Downloads (Pure)

Abstract

This paper presents experimental system identification and numerical modelling of a three story RC building monitored for a period of more than two years. System identification was conducted for 50 earthquake response records to obtain the frequencies and damping ratios considering the flexible base model that take into account soil-structure interaction (SSI). Trends of variation of modal parameters were investigated by correlating the peak response acceleration at the roof level with identified frequencies and damping ratios. A general trend of decreasing frequencies with increasing level of response was observed and quantified, whereas for damping ratios no clear trends were discernible. In the second part of the study, a series of three dimensional finite element models (FEMs) of the building were developed to investigate the influence of various structural and non-structural components (NSCs), such as cladding and partitions, as well as soil underneath the foundation and around the building, on the building dynamics. The aforementioned components were added to the FEM one by one and corresponding natural frequencies computed. The final, all-inclusive FEM was then calibrated using a sensitivity based model updating technique and experimental modal parameters by tuning the stiffness of structural concrete, soil and cladding. The updated FEM was further validated by comparing the recorded acceleration time histories to those simulated using the FEM. Finally, the updated FEM was used in time history analyses to assess the building serviceability limit state seismic performance. It was concluded from the investigations that natural frequencies depend quite strongly on the response magnitude even for low to moderate level of shaking. NSCs and SSI have been demonstrated, through both numerical models and FEM updating, to have a significant influence on the seismic response of the building. A calibrated FEM proved to be less conservative for simulating seismic responses compared to the initial FEM but the building still performed satisfactorily. (C) 2014 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)111-123
Number of pages13
JournalEngineering Structures
Volume65
DOIs
Publication statusPublished - 15 Apr 2014

Keywords

  • Instrumented RC building
  • Model updating
  • Non-structural components
  • Seismic monitoring
  • Seismic response
  • Serviceability limit state
  • Soil-structure interaction
  • System identification
  • Time history analysis
  • System-Identification
  • Parameter-Identification
  • Dynamic Characteristics
  • Drywall Partitions
  • Tall Buildings
  • Infill walls
  • Earthquake
  • Bridge
  • Foundations
  • Performance

Cite this

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title = "Seismic response trends evaluation and finite element model calibration of an instrumented RC building considering soil-structure interaction and non-structural components",
abstract = "This paper presents experimental system identification and numerical modelling of a three story RC building monitored for a period of more than two years. System identification was conducted for 50 earthquake response records to obtain the frequencies and damping ratios considering the flexible base model that take into account soil-structure interaction (SSI). Trends of variation of modal parameters were investigated by correlating the peak response acceleration at the roof level with identified frequencies and damping ratios. A general trend of decreasing frequencies with increasing level of response was observed and quantified, whereas for damping ratios no clear trends were discernible. In the second part of the study, a series of three dimensional finite element models (FEMs) of the building were developed to investigate the influence of various structural and non-structural components (NSCs), such as cladding and partitions, as well as soil underneath the foundation and around the building, on the building dynamics. The aforementioned components were added to the FEM one by one and corresponding natural frequencies computed. The final, all-inclusive FEM was then calibrated using a sensitivity based model updating technique and experimental modal parameters by tuning the stiffness of structural concrete, soil and cladding. The updated FEM was further validated by comparing the recorded acceleration time histories to those simulated using the FEM. Finally, the updated FEM was used in time history analyses to assess the building serviceability limit state seismic performance. It was concluded from the investigations that natural frequencies depend quite strongly on the response magnitude even for low to moderate level of shaking. NSCs and SSI have been demonstrated, through both numerical models and FEM updating, to have a significant influence on the seismic response of the building. A calibrated FEM proved to be less conservative for simulating seismic responses compared to the initial FEM but the building still performed satisfactorily. (C) 2014 Elsevier Ltd. All rights reserved.",
keywords = "Instrumented RC building, Model updating, Non-structural components, Seismic monitoring, Seismic response, Serviceability limit state, Soil-structure interaction, System identification, Time history analysis, System-Identification, Parameter-Identification, Dynamic Characteristics, Drywall Partitions, Tall Buildings, Infill walls, Earthquake, Bridge, Foundations, Performance",
author = "Faheem Butt and Piotr Omenzetter",
year = "2014",
month = "4",
day = "15",
doi = "10.1016/j.engstruct.2014.01.045",
language = "English",
volume = "65",
pages = "111--123",
journal = "Engineering Structures",
issn = "0141-0296",
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TY - JOUR

T1 - Seismic response trends evaluation and finite element model calibration of an instrumented RC building considering soil-structure interaction and non-structural components

AU - Butt, Faheem

AU - Omenzetter, Piotr

PY - 2014/4/15

Y1 - 2014/4/15

N2 - This paper presents experimental system identification and numerical modelling of a three story RC building monitored for a period of more than two years. System identification was conducted for 50 earthquake response records to obtain the frequencies and damping ratios considering the flexible base model that take into account soil-structure interaction (SSI). Trends of variation of modal parameters were investigated by correlating the peak response acceleration at the roof level with identified frequencies and damping ratios. A general trend of decreasing frequencies with increasing level of response was observed and quantified, whereas for damping ratios no clear trends were discernible. In the second part of the study, a series of three dimensional finite element models (FEMs) of the building were developed to investigate the influence of various structural and non-structural components (NSCs), such as cladding and partitions, as well as soil underneath the foundation and around the building, on the building dynamics. The aforementioned components were added to the FEM one by one and corresponding natural frequencies computed. The final, all-inclusive FEM was then calibrated using a sensitivity based model updating technique and experimental modal parameters by tuning the stiffness of structural concrete, soil and cladding. The updated FEM was further validated by comparing the recorded acceleration time histories to those simulated using the FEM. Finally, the updated FEM was used in time history analyses to assess the building serviceability limit state seismic performance. It was concluded from the investigations that natural frequencies depend quite strongly on the response magnitude even for low to moderate level of shaking. NSCs and SSI have been demonstrated, through both numerical models and FEM updating, to have a significant influence on the seismic response of the building. A calibrated FEM proved to be less conservative for simulating seismic responses compared to the initial FEM but the building still performed satisfactorily. (C) 2014 Elsevier Ltd. All rights reserved.

AB - This paper presents experimental system identification and numerical modelling of a three story RC building monitored for a period of more than two years. System identification was conducted for 50 earthquake response records to obtain the frequencies and damping ratios considering the flexible base model that take into account soil-structure interaction (SSI). Trends of variation of modal parameters were investigated by correlating the peak response acceleration at the roof level with identified frequencies and damping ratios. A general trend of decreasing frequencies with increasing level of response was observed and quantified, whereas for damping ratios no clear trends were discernible. In the second part of the study, a series of three dimensional finite element models (FEMs) of the building were developed to investigate the influence of various structural and non-structural components (NSCs), such as cladding and partitions, as well as soil underneath the foundation and around the building, on the building dynamics. The aforementioned components were added to the FEM one by one and corresponding natural frequencies computed. The final, all-inclusive FEM was then calibrated using a sensitivity based model updating technique and experimental modal parameters by tuning the stiffness of structural concrete, soil and cladding. The updated FEM was further validated by comparing the recorded acceleration time histories to those simulated using the FEM. Finally, the updated FEM was used in time history analyses to assess the building serviceability limit state seismic performance. It was concluded from the investigations that natural frequencies depend quite strongly on the response magnitude even for low to moderate level of shaking. NSCs and SSI have been demonstrated, through both numerical models and FEM updating, to have a significant influence on the seismic response of the building. A calibrated FEM proved to be less conservative for simulating seismic responses compared to the initial FEM but the building still performed satisfactorily. (C) 2014 Elsevier Ltd. All rights reserved.

KW - Instrumented RC building

KW - Model updating

KW - Non-structural components

KW - Seismic monitoring

KW - Seismic response

KW - Serviceability limit state

KW - Soil-structure interaction

KW - System identification

KW - Time history analysis

KW - System-Identification

KW - Parameter-Identification

KW - Dynamic Characteristics

KW - Drywall Partitions

KW - Tall Buildings

KW - Infill walls

KW - Earthquake

KW - Bridge

KW - Foundations

KW - Performance

U2 - 10.1016/j.engstruct.2014.01.045

DO - 10.1016/j.engstruct.2014.01.045

M3 - Article

VL - 65

SP - 111

EP - 123

JO - Engineering Structures

JF - Engineering Structures

SN - 0141-0296

ER -