Geomechanics and Engineering

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Site effect microzonation of Babol, Iran

  • Tavakoli, H.R. (Department of Civil Engineering, Babol Noushirvani University of Technology) ;
  • Amiri, M. Talebzade (Department of Civil Engineering, Babol Noushirvani University of Technology) ;
  • Abdollahzade, G. (Department of Civil Engineering, Babol Noushirvani University of Technology) ;
  • Janalizade, A. (Department of Civil Engineering, Babol Noushirvani University of Technology)
  • Received : 2015.01.31
  • Accepted : 2016.08.13
  • Published : 2016.12.12
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Abstract

Extensive researches on distribution of earthquake induced damages in different regions have shown that geological and geotechnical conditions of the local soils significantly influence behavior of alluvial areas under seismic loading. In this article, the site of Babol city which is formed up of saturated fine alluvial soils is considered as a case study. In order to reduce the uncertainties associated with earthquake resistant design of structures in this area (Babol city), the required design parameters have been evaluated with consideration of site's dynamic effects. The utilized methodology combines experimental ground ambient noise analysis, expressed in terms of horizontal to vertical (H/V) spectral ratio, with numerical one-dimensional response analysis of soil columns using DEEPSOIL software. The H/V spectral analysis was performed at 60 points, experimentally, for the region in order to estimate both the fundamental period and its corresponding amplification for the ground vibration. The investigation resulted in amplification ratios that were greater than one in all areas. A good agreement between the proposed ranges of natural periods and alluvial amplification ratios obtained through the analytical model and the experimental microtremor studies verifies the analytical model to provide a good engineering reflection of the subterraneous alluviums.

Keywords

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