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Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls

The modal properties of modular structures, such as their natural frequencies, damping ratios and mode shapes, are different than those of conventional structures, mainly due to different structural systems being used for assembling prefabricated modular units onsite. To study the dynamic characteri...

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Autores principales: Rashidi, Maria, Sharafi, Pejman, Alembagheri, Mohammad, Bigdeli, Ali, Samali, Bijan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7767127/
https://www.ncbi.nlm.nih.gov/pubmed/33419323
http://dx.doi.org/10.3390/ma13245816
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author Rashidi, Maria
Sharafi, Pejman
Alembagheri, Mohammad
Bigdeli, Ali
Samali, Bijan
author_facet Rashidi, Maria
Sharafi, Pejman
Alembagheri, Mohammad
Bigdeli, Ali
Samali, Bijan
author_sort Rashidi, Maria
collection PubMed
description The modal properties of modular structures, such as their natural frequencies, damping ratios and mode shapes, are different than those of conventional structures, mainly due to different structural systems being used for assembling prefabricated modular units onsite. To study the dynamic characteristics of modular systems and define a dynamic model, both the modal properties of the individual units and their connections need to be considered. This study is focused on the former aspect. A full-scale prefabricated volumetric steel module was experimentally tested using operational modal analysis technique under pure ambient vibrations and randomly generated artificial hammer impacts. It was tested in different situations: [a] bare (frame only) condition, and [b] infilled condition with different configurations of gypsum and cement-boards light-steel framed composite walls. The coupled module-wall system was instrumented with sensitive accelerometers, and its pure and free vibration responses were synchronously recorded through a data acquisition system. The main dynamic characteristics of the module were extracted using output-only algorithms, and the effects of the presence of infill wall panels and their material are discussed. Then, the module’s numerical micromodel for bare and infilled states is generated and calibrated against experimental results. Finally, an equivalent linear strut macro-model is proposed based on the calibrated data. The contribution of this study is assessing the effects of different infill wall materials on the dynamic characteristics of modular steel units, and proposing simple models for macro-analysis of infilled module assemblies.
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spelling pubmed-77671272020-12-28 Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls Rashidi, Maria Sharafi, Pejman Alembagheri, Mohammad Bigdeli, Ali Samali, Bijan Materials (Basel) Article The modal properties of modular structures, such as their natural frequencies, damping ratios and mode shapes, are different than those of conventional structures, mainly due to different structural systems being used for assembling prefabricated modular units onsite. To study the dynamic characteristics of modular systems and define a dynamic model, both the modal properties of the individual units and their connections need to be considered. This study is focused on the former aspect. A full-scale prefabricated volumetric steel module was experimentally tested using operational modal analysis technique under pure ambient vibrations and randomly generated artificial hammer impacts. It was tested in different situations: [a] bare (frame only) condition, and [b] infilled condition with different configurations of gypsum and cement-boards light-steel framed composite walls. The coupled module-wall system was instrumented with sensitive accelerometers, and its pure and free vibration responses were synchronously recorded through a data acquisition system. The main dynamic characteristics of the module were extracted using output-only algorithms, and the effects of the presence of infill wall panels and their material are discussed. Then, the module’s numerical micromodel for bare and infilled states is generated and calibrated against experimental results. Finally, an equivalent linear strut macro-model is proposed based on the calibrated data. The contribution of this study is assessing the effects of different infill wall materials on the dynamic characteristics of modular steel units, and proposing simple models for macro-analysis of infilled module assemblies. MDPI 2020-12-20 /pmc/articles/PMC7767127/ /pubmed/33419323 http://dx.doi.org/10.3390/ma13245816 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Rashidi, Maria
Sharafi, Pejman
Alembagheri, Mohammad
Bigdeli, Ali
Samali, Bijan
Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls
title Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls
title_full Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls
title_fullStr Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls
title_full_unstemmed Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls
title_short Operational Modal Analysis, Testing and Modelling of Prefabricated Steel Modules with Different LSF Composite Walls
title_sort operational modal analysis, testing and modelling of prefabricated steel modules with different lsf composite walls
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7767127/
https://www.ncbi.nlm.nih.gov/pubmed/33419323
http://dx.doi.org/10.3390/ma13245816
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