New Predictive Models for the v max/a max Ratio of Strong Ground Motions using Genetic Programming

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  author =       "E. Kermani and Y. Jafarian and M. H. Baziar",
  title =        "New Predictive Models for the v max/a max Ratio of
                 Strong Ground Motions using Genetic Programming",
  journal =      "International Journal of Civil Engineering",
  year =         "2009",
  volume =       "7",
  number =       "4",
  pages =        "236--247",
  month =        dec,
  keywords =     "genetic algorithms, genetic programming, earthquake, v
                 max/a max ratio, predictive equation",
  ISSN =         "1735-0522",
  broken =       "",
  URL =          "",
  size =         "12 pages",
  abstract =     "Although there is enough knowledge indicating on the
                 influence of frequency content of input motion on the
                 deformation demand of structures, state-of-the-practice
                 seismic studies use the intensity measures such as peak
                 ground acceleration (PGA) which are not frequency
                 dependent. The v max/a max ratio of strong ground
                 motions can be used in seismic hazard studies as the
                 representative of frequency content of the motions.
                 This ratio can be indirectly estimated by the
                 attenuation models of PGA and PGV which are functions
                 of earthquake magnitude, source to site distance,
                 faulting mechanism, and local site conditions. This
                 paper presents new predictive equations for v max/a max
                 ratio based on genetic programming (GP) approach. The
                 predictive equations are established using a reliable
                 database released by Pacific Earthquake Engineering
                 Research Center (PEER) for three types of faulting
                 mechanisms including strikeslip, normal and reverse.
                 The proposed models provide reasonable accuracy to
                 estimate the frequency content of site ground motions
                 in practical projects. The results of parametric study
                 demonstrate that v max/a max increases through
                 increasing earthquake moment magnitude and source to
                 site distance while it decreases with increasing the
                 average shear-wave velocity over the top 30m of the

Genetic Programming entries for Elnaz Kermani Yaser Jafarian Mohammad Hassan Baziar