An update on techniques to assess normal-mode behavior of rock arches by ambient vibrations

<p>Natural rock arches are rare and beautiful geologic landforms with important cultural value. As such, their management requires periodic assessment of structural integrity to understand environmental and anthropogenic influences on arch stability. Measurements of passive seismic vibrations...

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Autores principales:	M. Häusler, P. R. Geimer, R. Finnegan, D. Fäh, J. Ralston Moore
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Dynamic and structural geology QE500-639.5
Acceso en línea:	https://doaj.org/article/223c86e2a08d46c1b8d26488e2a852a9
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spelling	oai:doaj.org-article:223c86e2a08d46c1b8d26488e2a852a92021-11-11T13:32:31ZAn update on techniques to assess normal-mode behavior of rock arches by ambient vibrations10.5194/esurf-9-1441-20212196-63112196-632Xhttps://doaj.org/article/223c86e2a08d46c1b8d26488e2a852a92021-11-01T00:00:00Zhttps://esurf.copernicus.org/articles/9/1441/2021/esurf-9-1441-2021.pdfhttps://doaj.org/toc/2196-6311https://doaj.org/toc/2196-632X<p>Natural rock arches are rare and beautiful geologic landforms with important cultural value. As such, their management requires periodic assessment of structural integrity to understand environmental and anthropogenic influences on arch stability. Measurements of passive seismic vibrations represent a rapid and non-invasive technique to describe the dynamic properties of natural arches, including resonant frequencies, modal damping ratios, and mode shapes, which can be monitored over time for structural health assessment. However, commonly applied spectral analysis tools are often limited in their ability to resolve characteristics of closely spaced or complex higher-order modes. Therefore, we investigate two techniques well-established in the field of civil engineering through application to a set of natural arches previously characterized using polarization analysis and spectral peak-picking techniques. Results from enhanced frequency domain decomposition and parametric covariance-driven stochastic subspace identification modal analyses showed generally good agreement with spectral peak-picking and frequency-dependent polarization analyses. However, we show that these advanced techniques offer the capability to resolve closely spaced modes including their corresponding modal damping ratios. In addition, due to preservation of phase information, enhanced frequency domain decomposition allows for direct and convenient three-dimensional visualization of mode shapes. These techniques provide detailed characterization of dynamic parameters, which can be monitored to detect structural changes indicating damage and failure, and in addition have the potential to improve numerical models used for arch stability assessment. Results of our study encourage broad adoption and application of these advanced modal analysis techniques for dynamic analysis of a wide range of geological features.</p>M. HäuslerP. R. GeimerR. FinneganD. FähJ. Ralston MooreCopernicus PublicationsarticleDynamic and structural geologyQE500-639.5ENEarth Surface Dynamics, Vol 9, Pp 1441-1457 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Dynamic and structural geology QE500-639.5
spellingShingle	Dynamic and structural geology QE500-639.5 M. Häusler P. R. Geimer R. Finnegan D. Fäh J. Ralston Moore An update on techniques to assess normal-mode behavior of rock arches by ambient vibrations
description	<p>Natural rock arches are rare and beautiful geologic landforms with important cultural value. As such, their management requires periodic assessment of structural integrity to understand environmental and anthropogenic influences on arch stability. Measurements of passive seismic vibrations represent a rapid and non-invasive technique to describe the dynamic properties of natural arches, including resonant frequencies, modal damping ratios, and mode shapes, which can be monitored over time for structural health assessment. However, commonly applied spectral analysis tools are often limited in their ability to resolve characteristics of closely spaced or complex higher-order modes. Therefore, we investigate two techniques well-established in the field of civil engineering through application to a set of natural arches previously characterized using polarization analysis and spectral peak-picking techniques. Results from enhanced frequency domain decomposition and parametric covariance-driven stochastic subspace identification modal analyses showed generally good agreement with spectral peak-picking and frequency-dependent polarization analyses. However, we show that these advanced techniques offer the capability to resolve closely spaced modes including their corresponding modal damping ratios. In addition, due to preservation of phase information, enhanced frequency domain decomposition allows for direct and convenient three-dimensional visualization of mode shapes. These techniques provide detailed characterization of dynamic parameters, which can be monitored to detect structural changes indicating damage and failure, and in addition have the potential to improve numerical models used for arch stability assessment. Results of our study encourage broad adoption and application of these advanced modal analysis techniques for dynamic analysis of a wide range of geological features.</p>
format	article
author	M. Häusler P. R. Geimer R. Finnegan D. Fäh J. Ralston Moore
author_facet	M. Häusler P. R. Geimer R. Finnegan D. Fäh J. Ralston Moore
author_sort	M. Häusler
title	An update on techniques to assess normal-mode behavior of rock arches by ambient vibrations
title_short	An update on techniques to assess normal-mode behavior of rock arches by ambient vibrations
title_full	An update on techniques to assess normal-mode behavior of rock arches by ambient vibrations
title_fullStr	An update on techniques to assess normal-mode behavior of rock arches by ambient vibrations
title_full_unstemmed	An update on techniques to assess normal-mode behavior of rock arches by ambient vibrations
title_sort	update on techniques to assess normal-mode behavior of rock arches by ambient vibrations
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/223c86e2a08d46c1b8d26488e2a852a9
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An update on techniques to assess normal-mode behavior of rock arches by ambient vibrations

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