Abrahamson and Silva
geotech R package
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).
- Kaklamanos, J., and K. T. Elmy (2016a). geotech: Geotechnical Engineering. R package version 1.0.
- Kaklamanos, J., and K. T. Elmy (2016b). Development of a geotechnical engineering software package in R and its implementation in the civil engineering curriculum, Geotechnical and Structural Engineering Congress 2016, Phoenix, Arizona, 14-17 February 2016, American Society of Civil Engineers (ASCE), C. Y. Chandran and M. I. Hoit (eds)., pp. 635–647.
geotech R package web siteReference manual
Kaklamanos and Elmy (2016) conference paper
and presentationUSUCGER final summary report
Phase diagrams and index parameters
Grain size distributions
Mohr circle analyses
Lateral earth pressures
Background plot functions
nga R package
The nga R package is an implementation of the earthquake ground motion prediction equations released in 2008 as part of the Next Generation Attenuation of Ground Motions (NGA-West) Project, using the open-source statistical language and environment R.
- Kaklamanos, J., and E. M. Thompson (2010). nga: NGA Ground Motion Prediction Equations. R package version 1.4-1.
- Kaklamanos, J., D. M. Boore, E. M. Thompson, and K. W. Campbell (2010). Implementation of the Next Generation Attenuation (NGA) ground-motion prediction equations in Fortran and R, U.S. Geological Survey Open-File Report 2010-1296, 43 p.
nga R package web siteReference manual
Kaklamanos et al. (2010) open-file reportChange log
NGA (comprehensive functions for all models)
Abrahamson and Silva (2008)
Boore and Atkinson (2008)
Campbell and Bozorgnia (2008)
Chiou and Youngs (2008)
Mathcad worksheets for the NGA-W1 and NGA-W2 ground motion models
We have developed Mathcad worksheets for the ground motion prediction equations 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.
NGA-West 1 worksheets:
- Blair, T. J., T. C. Cross, A. N. Moolacattu, B. M. Picard, and J. Kaklamanos (2016a). Implementation of the Next Generation Attenuation of Ground Motions (NGA-West 1) models in Mathcad. Merrimack College, North Andover, Mass.
- Blair, T. J., T. C. Cross, A. N. Moolacattu, B. M. Picard, and J. Kaklamanos (2016b). Implementation of the Enhancement of Next Generation Attenuation Relationships for Western U.S. (NGA-West 2) models in Mathcad. Merrimack College, North Andover, Mass.
(2008)Boore and Atkinson
(2008)Campbell and Bozorgnia
(2008)Chiou and Youngs
NGA-West 2 worksheets:
Abrahamson, Silva, and Kamai
(2014)Boore, Stewart, Seyhan, and Atkinson
(2014)Campbell and Bozorgnia
(2014)Chiou and Youngs
Distance relations in ground-motion prediction equations
As part of the Kaklamanos et al. (2011) paper, we derived physical equations relating three earthquake distance parameters used in these recent ground-motion prediction equations: the rupture distance (RRUP), Joyner-Boore distance (RJB), and site coordinate (RX). The following electronic files are provided for implementing the physical distance equations.
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.
- R script, using the open-source statistical language and environment R. This file may be opened using any text editor.
- Mathcad worksheet, with various examples and numerical solutions for back-solving.
- Microsoft Excel worksheet. When opening the document, please enable macros; otherwise, the worksheet will not function.