Articles | Volume 9, issue 6
Research article
11 Nov 2021
Research article |  | 11 Nov 2021

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

Mauro Häusler, Paul Richmond Geimer, Riley Finnegan, Donat Fäh, and Jeffrey Ralston Moore

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Cited articles

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Au, S.-K., Brownjohn, J. M. W., Li, B., and Raby, A.: Understanding and managing identification uncertainty of close modes in operational modal analysis, Mech. Syst. Signal Pr., 147, 107018,, 2021. 
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Short summary
Natural rock arches are valued landmarks worldwide. As ongoing erosion can lead to rockfall and collapse, it is important to monitor the structural integrity of these landforms. One suitable technique involves measurements of resonance, produced when mainly natural sources, such as wind, vibrate the spans. Here we explore the use of two advanced processing techniques to accurately measure the resonant frequencies, damping ratios, and deflection patterns of several rock arches in Utah, USA.