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)