Software

geotech R package

Summary:

R is an open-source, object-oriented language and environment for computing that offers a wide availability of add-on user-contributed software codes (packages). The geotech R package is the first to perform a broad range of calculations that appear in geotechnical engineering education, research, and practice; its development was supported by a special project grant through the United States Universities Council and Geotechnical Education and Research (USUCGER). Note that the geotech R package is no longer actively updated on the R website, but files for installing and running the package are available below and at the geotech R package archive.

Citations:

Resources:

geotech R package web site
Reference manual (PDF)
Installation file (zip)
Kaklamanos and Elmy (2016) conference paper and presentation
USUCGER final summary report

Source code:

Phase diagrams and index parameters
Grain size distributions
Plasticity
Soil classification
Subsurface exploration
Groundwater
Mohr circle analyses
Stress
Bearing capacity
Lateral earth pressures
Slope stability
Background plot functions

nga R package

Summary:

The nga R package is an implementation of the earthquake ground-motion models released in 2008 as part of the Next Generation Attenuation of Ground Motions (NGA-West 1) Project, using the open-source statistical language and environment R. Note that the nga R package is no longer actively updated on the R website, but files for installing and running the package are available below and at the nga R package archive.

Citations:

Resources:

nga R package web site
Reference manual (PDF)
Installation file (zip)
Kaklamanos et al. (2010) open-file report
Change log (PDF)

Source code:

NGA (comprehensive functions for all models)
Abrahamson and Silva (2008)
Boore and Atkinson (2008)
Campbell and Bozorgnia (2008)
Chiou and Youngs (2008)
Miscellaneous Functions

Mathcad worksheets for the NGA-W1 and NGA-W2 ground motion models

Summary:

We have developed Mathcad worksheets for the ground-motion models released in 2008 as part of the Next Generation Attenuation of Ground Motions (NGA-West 1) Project and in 2014 as part of the Enhancement of Next Generation Attenuation Relationships for Western U.S. (NGA-West 2) Project.  Because the Mathcad worksheets present the equations in a highly visual, easy-to-comprehend framework, they allow for users to obtain a greater understanding of the models than otherwise possible, and also allow users to perform calculations on sub-portions of the models that are not readily available in other programs.

Citations:

NGA-West 1 worksheets:

Abrahamson and Silva (2008)

Boore and Atkinson (2008)

Campbell and Bozorgnia (2008)

Chiou and Youngs (2008)

Idriss (2008)

NGA-West 2 worksheets:

Abrahamson, Silva, and Kamai (2014)

Boore, Stewart, Seyhan, and Atkinson (2014)

Campbell and Bozorgnia (2014)

Chiou and Youngs (2014)

Idriss (2014)

Distance relations in ground-motion models

Summary:

As part of the Kaklamanos et al. (2011) paper, we derived physical equations relating three earthquake distance parameters used in these ground-motion models: the rupture distance (RRUP), Joyner-Boore distance (RJB), and site coordinate (RX). The following electronic files are provided for implementing the physical distance equations.

Citation:

Kaklamanos, J., L. G. Baise, and D. M. Boore (2011). Estimating unknown input parameters when implementing the NGA ground-motion prediction equations in engineering practice, Earthquake Spectra, Vol. 27, No. 4, pp. 1219–1235.

Resources: