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Field Measurement-Based System Identification and Dynamic Response Prediction of a Unique MIT Building.

Young-Jin Cha1, Peter Trocha2, Oral Büyüköztürk3

  • 1Department of Civil Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada. young.cha@umanitoba.ca.

Sensors (Basel, Switzerland)
|July 5, 2016
PubMed
Summary
This summary is machine-generated.

This study analyzed the dynamic behavior of a tall building using accelerometer data. The simplified lumped-mass beam model accurately predicted the building's natural frequencies and accelerations.

Keywords:
ambient vibrationdynamic responsesensor networkspectral analysissystem identification

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Area of Science:

  • Structural Engineering
  • Geotechnical Engineering
  • Vibration Analysis

Background:

  • Tall buildings are prevalent in urban environments, yet their dynamic characteristics based on field measurements are understudied.
  • Understanding the dynamic behavior of tall structures is crucial for ensuring safety and performance.

Purpose of the Study:

  • To characterize and model the dynamic behavior of the Green Building at MIT using field measurements.
  • To compare field data with predictions from a simplified lumped-mass beam model (SLMM).

Main Methods:

  • Utilized an accelerometer network to record structural responses to ambient vibrations, blast loading, and seismic events.
  • Applied spectral and signal coherence analysis to identify dynamic properties like natural frequencies and modes.
  • Updated the SLMM using inverse solving and multiobjective optimization based on measured responses.

Main Results:

  • Identified natural frequencies, vibration modes, foundation rocking, and structural asymmetries.
  • Established a relationship between foundation rocking and structural natural frequencies.
  • Demonstrated good agreement between measured and predicted natural frequencies and accelerations by the updated SLMM.

Conclusions:

  • The simplified lumped-mass beam model, when updated with field data, effectively represents the dynamic behavior of tall buildings.
  • Field measurements provide valuable insights into the complex dynamic characteristics of tall structures.
  • This research contributes to a better understanding of tall building dynamics for improved structural design and safety.