Gaussian-filtered Horizontal Motion (GHM) plots of non-synchronous ambient microtremors for the identification of flexural and torsional modes of a building

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F18%3A00496667" target="_blank" >RIV/67985891:_____/18:00496667 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.soildyn.2018.05.018" target="_blank" >http://dx.doi.org/10.1016/j.soildyn.2018.05.018</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.soildyn.2018.05.018" target="_blank" >10.1016/j.soildyn.2018.05.018</a>

Result language

angličtina

Original language name

Gaussian-filtered Horizontal Motion (GHM) plots of non-synchronous ambient microtremors for the identification of flexural and torsional modes of a building

Original language description

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).n

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20101 - Civil engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Soil dynamics and earthquake engineering

ISSN

0267-7261

e-ISSN

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Volume of the periodical

112

Issue of the periodical within the volume

SEP

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

13

Pages from-to

243-255

UT code for WoS article

000436912600022

EID of the result in the Scopus database

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