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Dynamic analysis of ground with rigorous use of strain dependency and its application to seismic microzonation of alluvial plane

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  • Takaharu Ito
  • Ikuo Towhata

Abstract

Seismic microzonation is one of the most important measures to mitigate earthquake hazards in urban areas. Because the ground motion varies significantly with the subsurface geology, it is needed for microzonation to account as much as possible for the local soil conditions. Noteworthy is that nonlinear deformation properties of soil play essential roles in amplification of strong ground motion. It is desired furthermore to focus on the expected damage extent in addition to the calculated maximum acceleration and/or velocity. The present study first developed a computer code for one-dimensional response analysis of ground that reasonably takes into account nonlinear dynamic soil properties. Second, correlations between the calculated ground motion and damage extent were obtained by examining seismic damages during the past earthquakes. By combining these two issues, seismic microzonation was carried out, and detailed damage distribution was assessed. The product of this study covers not only the damage caused by ground shaking but also liquefaction problem and lifeline damage. Copyright Springer Science+Business Media B.V. 2012

Suggested Citation

  • Takaharu Ito & Ikuo Towhata, 2012. "Dynamic analysis of ground with rigorous use of strain dependency and its application to seismic microzonation of alluvial plane," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 64(2), pages 1079-1104, November.
    • Handle: RePEc:spr:nathaz:v:64:y:2012:i:2:p:1079-1104
    DOI: 10.1007/s11069-012-0284-4
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    Cited by:

    1. Neelima D. Satyam & Ikuo Towhata, 2016. "Site-specific ground response analysis and liquefaction assessment of Vijayawada city (India)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 81(2), pages 705-724, March.
    2. Neelima Satyam & Ikuo Towhata, 2016. "Site-specific ground response analysis and liquefaction assessment of Vijayawada city (India)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 81(2), pages 705-724, March.

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