Coherency model for translational and rotational ground motions

Show simple item record Rodda, Gopala Krishna Basu, Dhiman 2018-01-30T11:28:17Z 2018-01-30T11:28:17Z 2018-07
dc.identifier.citation Rodda, Gopala Krishna and Basu, Dhiman, "Coherency model for translational and rotational ground motions", Bulletin of Earthquake Engineering, DOI: 10.1007/s10518-017-0304-6, vol. 16, no. 7, pp. 2687-2710, Jul. 2018. en_US
dc.identifier.issn 1570-761X
dc.identifier.issn 1573-1456
dc.description.abstract Spatial variability of the translational ground motion may influence the seismic design of certain civil engineering structures with spatially extended foundations. Lagged coherency is usually considered to be the best descriptor of the spatial variability. Most coherency models developed to date do not consider the spatial variability of the spectral shape of auto-spectral density (ASD), which is expected to be critical. This paper proposes a coherency model that accounts for the variability in spectral shape of ASD. Numerical results illustrate that the effect is not that critical for a dense array but can be significant in case of large array. Rotational ground motions on the other hand are not measured by the accelerograph deployed in the free-field owing to the unavailability of appropriate instruments and rather extracted from the recorded three-component translational data. Previous studies [e.g., Basu et al. (Eng Struct 99:685-707, 2015)] reported the spatial variability of extracted rotational components, even over a dimension within the span of most civil engineering structures, for example, tens of metres. Since rotation does not propagate like a plane wave, coherency model based on plane wave propagation does not apply to address the spatial variability of rotational components. This paper also proposes an alternative to address the spatial variability of rotational components. Illustrations based on relatively short separation distance confirm the expectation.
dc.description.statementofresponsibility by Gopala Krishna Rodda and Dhiman Basu
dc.format.extent vol. 16, no. 7, pp. 2687-2710
dc.language.iso en en_US
dc.publisher Springer en_US
dc.subject Spatial variability en_US
dc.subject Lagged coherency en_US
dc.subject Rotational ground motion en_US
dc.subject Rocking acceleration en_US
dc.subject Torsional acceleration en_US
dc.title Coherency model for translational and rotational ground motions en_US
dc.type Article en_US
dc.relation.journal Bulletin of Earthquake Engineering

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