Phase-structure in conditional simulation of spatially varying ground motion and possible influence on structural demand

Show simple item record Rodda, Gopala Krishna Gurjar, Narsiram Basu, Dhiman
dc.coverage.spatial Singapore 2021-10-08T05:30:46Z 2021-10-08T05:30:46Z 2021-09
dc.identifier.citation Rodda, Gopala Krishna; Gurjar, Narsiram and Basu, Dhiman, "Phase-structure in conditional simulation of spatially varying ground motion and possible influence on structural demand", Journal of Earthquake and Tsunami, DOI: 10.1142/S1793431122500038, Sep. 2021. en_US
dc.identifier.issn 793-4311
dc.identifier.issn 1793-7116
dc.description.abstract Recorded ground motion is nonstationary in both intensity and frequency contents. Two methodologies were reported by the authors elsewhere for generating spatially varying ground motion (SVGM), namely, (i) auto-spectral density (ASD)-based framework, and (ii) evolutionary power-spectral density (EPSD)-based framework. While the former framework imparts nonstationarity through a uniform modulation (that accounts for nonstationarity only in intensities), the latter framework accounts for nonstationarity in both intensity and frequency contents. Reported EPSD-based framework was modeled through a decay function and a random component and was investigated only in the context of horizontal ground motion. Reported EPSD-based framework made two strong assumptions that need further investigation: (i) spatial variation of the random component was assumed to be frequency independent; and (ii) phase-structure of the ground excitation simulated around the reference station (with seed motion) was assumed to be same as that of the seed motion. This paper investigates the possible impact of these two assumptions on the simulated SVGM through appropriately revising the framework and introducing the phase-structure accordingly. Possible effects of the phase-structure on structural demand are investigated through an idealized long-span bridge. Revised EPSD-based framework is next assessed against the vertical recordings of SMART1 array along with the auto-spectral density (ASD) framework. Though spectral representation is nearly identical in both the frameworks, the acceleration time series simulated using the revised EPSD-based framework matches the recorded data better when compared with the ASD-based framework. Possible effect of spatially varying vertical ground motion on the seismic design is investigated through the same idealized bridge model. Significant increase in the demand of axial force in piers and mid-span moment in the deck are observed. Although these inferences are contingent on the idealized example considered for illustration, the spatially varying vertical ground motion is expected to contribute significantly to the seismic design of long-span bridges.
dc.description.statementofresponsibility by Gopala Krishna Rodda, Narsiram Gurjar and Dhiman Basu
dc.language.iso en_US en_US
dc.publisher World Scientific Publishing en_US
dc.subject Nonstationary vertical ground motion en_US
dc.subject Spatially varying ground motion en_US
dc.subject Hilbert transform en_US
dc.subject Modulating function en_US
dc.title Phase-structure in conditional simulation of spatially varying ground motion and possible influence on structural demand en_US
dc.type Article en_US
dc.relation.journal Journal of Earthquake and Tsunami

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