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39
GLOSSARY
Aloop: Area of hysteresis loop CPT: Cone Penetration Test
[C]: velocity proportional damping matrix CSR: Cyclic Stress Ratio
f1 and f2, f3, f4: Frequencies for Rayleigh viscous damping DOT: Department of transportation
G : Shear modulus DSHA: Deterministic Seismic Hazard Analysis
Gmax: Maximum shear modulus (usually obtained from DSS: (cyclic) Direct Simple Shear (test)
shear wave velocity)
EL: Equivalent-Linear
h, hi: thickness of layer
EPRI: Electric Power Research Institute
[K ]: stiffness matrix
GMPE: Ground Motion Prediction Equation
k, k i: element of stiffness matrix
IBC: International Building Code
[M ]: Mass matrix
LRFD: Load and Resistance Factor Design
m: element of mass matrix
MCE: Maximum Considered Earthquake
qc: uncorrected tip resistance from CPT sounding
MR: Modulus Re-matching only with extended Masing rule
Su: undrained shear strength of soil
MRD: approximate match of both modulus and damping
To: Fundamental period of a soil column or structure with extended Masing rule
{u}: displacement vector MRDF: Modulus reduction and damping matching with
non-Masing rule
Vs: Shear wave velocity
NGA: Next Generation Attenuation (relationship)
Vs30: (average) shear wave velocity of the top 30 meters
NL: Nonlinear
R : Rayleigh damping coefficient
PEER: Pacific Earthquake Engineering Research Center
: damping or coefficient in Newmark-type numerical inte-
gration of equation of motion PI: Principal Investigator
R : Rayleigh damping coefficient PSHA: Probabilistic Seismic Hazard Analysis
: shear strain pwp: pore water pressure
c: cyclic shear strain ReMI: Refraction Microtremor
c: cyclic shear stress RVT: Random Vibration Theory
tar: Target damping ratio SASW: Spectral Analysis of Surface Waves
: Wilson time stepping coefficient sCPT: seismic Cone Penetration Test
: mass density of soil SFSI: Soil-Foundation-Structure Interaction (the same as
SSI: Soil-Structure-Interaction)
1-D: One dimensional
SPT: Standard Penetration Test
2-D: Two dimensional
SSI: Soil-Structure Interaction
3-D: Three dimensional
UHRS: Uniform Hazard Response Spectrum
CMS: Conditional Mean Spectrum
USAEC: United States Corps of Engineers
COSMOS: The Consortium of Organizations for Strong-
Motion Observation Systems USGS: United States Geologic Survey
