System Identification of a Volumetric Steel Modular Frame Using Experimental and Numerical Vibration Analysis
Publication: Journal of Architectural Engineering
Volume 27, Issue 4
Abstract
This paper presents the findings of an experimental and numerical study on the system identification of modular steel frames in a laboratory environment. The project is a part of a broad study about the structural response of modular steel buildings. For this purpose, an experimental program is conducted on a full-scale volumetric prefabricated steel module, which is designed based on Australian standards. The module is fixed on a strong floor, instrumented with sensitive accelerometers, and its ambient and free vibration responses are captured and recorded. The output-only algorithms of operational modal analysis procedure, that is, direct fast Fourier transform, enhanced frequency domain decomposition, and stochastic subspace identification, are employed for extracting the main dynamic properties of the module, including natural frequencies, mode shapes, and modal damping ratios. Then the numerical finite-element models of the module are generated in micro and macro levels with continuum solid and beam elements, respectively. The numerical models are verified with the results of the experimental program and the discrepancies are discussed. The findings of this study are be used as a basis for research on the fundamental behavior of steel module assemblies and their interaction for the design of multistory modular buildings.
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Acknowledgments
The authors acknowledge the support of Australian Research Council (ARC) grant DE190100113 in this research project and writing of this paper.
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© 2021 American Society of Civil Engineers.
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Received: Oct 19, 2020
Accepted: Jun 15, 2021
Published online: Aug 2, 2021
Published in print: Dec 1, 2021
Discussion open until: Jan 2, 2022
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