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Gaussian-filtered Horizontal Motion (GHM) plots of non-synchronous ambient microtremors for the identification of flexural and torsional modes of a building
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SYSNO ASEP 0496667 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Gaussian-filtered Horizontal Motion (GHM) plots of non-synchronous ambient microtremors for the identification of flexural and torsional modes of a building Author(s) Dal Moro, Giancarlo (USMH-B) RID, ORCID, SAI
Weber, T.M. (CH)
Keller, L. (CH)Source Title Soil dynamics and earthquake engineering. - : Elsevier - ISSN 0267-7261
Roč. 112, SEP (2018), s. 243-255Number of pages 13 s. Publication form Print - P Language eng - English Country NL - Netherlands Keywords Dynamic load ; Single-sensor in situ vibration measurements ; Structural assessment ; Gaussian-filtered Horizontal Motion (GHM) ; Torsional and flexural modes ; Finite-Element Modeling (FEM) Subject RIV JM - Building Engineering OECD category Civil engineering Institutional support USMH-B - RVO:67985891 UT WOS 000436912600022 DOI 10.1016/j.soildyn.2018.05.018 Annotation It is often assumed that, in order to identify flexural and torsional vibration modes of a building, it is necessary to record synchronous data from a series of sensors deployed at different points. In the present paper, we present a simple and straightforward methodology to unambiguously identify flexural and torsional modes through the analysis of non synchronous data collected by a single sensor placed in succession at different points of the structure. This is accomplished by recording few minutes of ambient microtremor data by means of a 3-component geophone placed at different points of the same floor. Amplitude spectra are computed for determining the vibration frequencies. Successively, in order to identify the type of motion, we apply a series of narrow Gaussian filters centered at the previously-identified frequencies. By plotting the horizontal motion for each considered point, we are then able to simply and unambiguously determine whether the motion of a given frequency refers to a flexural or torsional mode. If, for a given frequency, the motion at two (or more) points has the same direction and similar amplitude, that frequency represents a flexural mode, while in case the directions and the amplitude are different, elementary considerations indicate that this is predominantly torsional. The methodology is first introduced by considering a case study where synchronous microtremor data are also recorded. In a second case study, the method is applied to non-synchronous microtremor data collected at a 25 storey building and results are compared with the numerical simulations performed by means of the Finite Element Method (FEM).
Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2019
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