• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/117/S2/0783-0796

    • Keywords

       

      Site effect; topography effect; two-dimensional hill; characteristic period; amplification; microzonation; design spectra; shape ratio; shape of the hill.

    • Abstract

       

      This paper presents the results of an extensive numerical parametric study on seismic behavior of 2D homogenous hills subjected to vertically propagating incident SV waves. It is shown that the amplification potential of these hills is strongly influenced by the wavelength, by the shape ratio, by the shape of the hill and in a less order of importance, by the Poisson ratio of the media. The 2D topography effect could be ignored, only if the hill has a shape ratio of less than 0.1 or if it is subjected to incident waves with predominant dimensionless periods of greater than 13 times the shape ratio. In incidence of waves with wavelengths longer than the width of the hill, the amplification curve usually finds its maximum at the crest and decreases towards the base of the hill. Else, some de-amplification zones would occur along the hill. Among hills with similar shape ratios, those with intermediate cross section areas show intermediate seismic behavior, too. Estimated seismic site coefficients for the crest of a 2D rocky hill depend on its shape ratio and could reach even 1.7, which encourages one to classify it according to standard site categorization procedures as soil profile types SC or SD instead of the conventional SB type.

    • Author Affiliations

       

      Mohsen Kamalian1 Abdollah Sohrabi-Bidar2 Arash Razmkhah3 Amirata Taghavi4 Iraj Rahmani5

      1. Geotechnical Engineering Research Center, International Institute of Earthquake Engineering and Seismology, 26 Arghavan St., North Dibajee, Farmanieh, Tehran, I.R. Iran.
      2. Seismology Research Center, International Institute of Earthquake Engineering and Seismology, 26 Arghavan St., North Dibajee, Farmanieh, Tehran, I.R. Iran.
      3. Civil Engineering Department, Faculty of Engineering, Islamic Azad University, South of Tehran Campus, Ahang Highway, Abouzar Building, Afsarieh Highway, Tehran, I.R. Iran.
      4. Civil Engineering Department, Iran University of Science and Technology, Narmak, Tehran, I.R. Iran.
      5. Transportation Research Institute, No. 19, Noor Street, Afrigha Avenue, Tehran, I.R. Iran.
    • Dates

       
  • Journal of Earth System Science | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.