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).

Citations:

  • 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.
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) Project, using the open-source statistical language and environment R.

Citations:

  • 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.
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:

  • 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.
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:

  • 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.