Impact of Local Site Conditions on Simulation of Non-stationary Spatial Variable Seismic Motions

Authors

  • Nassima Benmansour
    Affiliation
    RISk Assessment & Management Laboratory (RISAM), University of Tlemcen, P.O. Box 230, Tlemcen, Algeria
  • Rachid Derbal
    Affiliation
    RISk Assessment & Management Laboratory (RISAM), University of Tlemcen, P.O. Box 230, Tlemcen, Algeria Department of Civil Engineering, University of Ain Temouchent, P.O. Box 284, Ain Temouchent, Algeria
  • Mustapha Djafour
    Affiliation
    RISk Assessment & Management Laboratory (RISAM), University of Tlemcen, P.O. Box 230, Tlemcen, Algeria
  • Salvador Ivorra
    Affiliation
    Department of Civil Engineering, University of Alicante, San Vicente del Raspeig, Apartado 99, 03080, Spain
  • Mohammed Matallah
    Affiliation
    RISk Assessment & Management Laboratory (RISAM), University of Tlemcen, P.O. Box 230, Tlemcen, Algeria
https://doi.org/10.3311/PPci.16208

Abstract

It is commonly accepted that multi-scale structures are subject to spatially variable seismic motions. This spatial variability of seismic motions is described by different intensities at different locations due to the coherency loss effect, wave passage effect and local site conditions. For multi-scale structures, the estimation of seismic excitations must consider these factors. Often, the influence of the spatial variability of seismic motion on the dynamic response of structures is performed by neglecting the site effect. In several cases, it has been observed that the high intensities of seismic motion are caused by the site amplification besides coherency loss and wave passage effects. This study aims to analyze the impact of local site conditions on seismic motions. For this purpose, a method of simulation of spatially variable seismic motions is performed. The seismic signals on the bedrock are defined by considering a target power spectral density and a coherency loss model. According to the seismic wave propagation theory, the projection of these seismic motions on the surface is realized. The results of this study show that neglecting the local site conditions induces an undervaluation of spatially variable seismic excitations.

Keywords:

ground motion, spatial variability, power spectral density, coherency loss, local site conditions, simulation method

Citation data from Crossref and Scopus

Published Online

2021-03-05

How to Cite

Benmansour, N., Derbal, R., Djafour, M., Ivorra, S., Matallah, M. “Impact of Local Site Conditions on Simulation of Non-stationary Spatial Variable Seismic Motions”, Periodica Polytechnica Civil Engineering, 65(3), pp. 751–760, 2021. https://doi.org/10.3311/PPci.16208

Issue

Section

Research Article