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Liquefaction Options - VST

The following additional correction factors can be applied when performing a liquefaction analysis with VST data:

Magnitude Scaling Factor (MSF)

The Magnitude Scaling Factor is used to adjust the CSR or CRR to an earthquake magnitude value of M=7.5.

The following options are available for MSF:

  • None
  • Tokimatsu and Seed (1987)
  • Idriss (1999)
  • Andrus Stokoe (1997)
  • Idriss and Boulanger (2008)
  • Idriss (NCEER)

Stress Reduction Factor (Rd)

Rd is the shear stress reduction coefficient, and is used to determine the maximum shear stress at different depths. Typically, values range from 1 at the ground surface to lower values at greater depths.

The following calculation methods are available for Rd:

  • NCEER (1997)
  • Idriss (1999)
  • Kayen (1992)
  • Cetin et al. (2004)
  • Liao and Whitman (1986)

Overburden Correction Factor

Ksigma is an overburden correction factor used to adjust the CSR or CRR to a common effective overburden stress.

The following calculation methods are available for Ksigma:

  • None
  • Idriss and Boulanger (2004)
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