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Static and dynamic structural analysis of 2D and 3D frames with elastic and geometric stiffness

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Version 20100105 - published on 09 Nov 2010

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    first mode base isolated building SCREENSHOT #3 building with set back tesseract



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Frame3DD is free open-source software for static and dynamic structural analysis of 2D and 3D frames and trusses with elastic and geometric stiffness. It computes the static deflections, reactions, internal element forces, natural frequencies, mode shapes and modal participation factors of two- and three- dimensional elastic structures using direct stiffness and mass assembly. Frame3DD has its own text-file input format (.3dd), but additionally supports matlab (.m) and spreadsheet (.csv) file formats, and offers graphical output including mode shape animation via Gnuplot version 4.2.

The program is written in plain ANSI C. The source code includes: frame analysis, LDL' decomposition, LU decomposition, Newton-Raphson iteration, sub-space iteration, Stodola iteration, Sturm eigenvalue check, static condensation, Guyan reduction, and dynamic condensation.

Frame3DD is licensed under the GNU General Public License.

Source code, examples, user input templates, documentation, and executeables for Windows, OS X, and Linux are curated via SVN at

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  1. Howard G. Allen, Background to Buckling, McGraw-Hill, 1980. ASIN: 0070841004
  2. Klaus-Jurgen Bathe, Finite Element Procedures, Prentice-Hall, 1995. ISBN: 0133014584
  3. Arthur P. Boresi, Richard J. Schmidt, and Omar M. Sidebottom, Advanced Mechanics of Materials, John Wiley & Sons, 1993. ISBN: 0471551570
  4. Raymond W. Clough and Joseph Penzien, Dynamics of Structures, McGraw-Hill, 1993. ASIN: 0070113920
  5. J. P. Den Hartog, Advanced Strength of Materials, Dover Press, 1987. ISBN: 0486654079
  6. Thomas J. R. Hughes, The Finite Element Method: Linear Static and Dynamic Finite Element Analysis, Dover Press, 2000. ISBN: 0486411818
  7. Aslam Kassimali, Matrix Analysis of Structures, Brooks/Cole, 1999. ISBN: 0534206700
  8. Jaroslav Mackerle, Finite element linear and nonlinear, static and dynamic analysis of structural elements: a bibliography (1992-1995), Engineering Computations, vol. 14, no. 4, pp. 347-440, 1997.
  9. Jaroslav Mackerle, Finite element linear and nonlinear, static and dynamic analysis of structural elements - an addendum - A bibliography (1996-1999), Engineering Computations, vol. 17, no. 3, pp. 274-351, 2000.
  10. William McGuire, Richard H. Gallagher, and Ronald D. Ziemian, Matrix Structural Analysis, 2nd ed. John Wiley, 1999. ISBN: 0471376515
  11. W.D. Pilkey, Weize Kang and Uwe Schramm, New structural matrices for a beam element with shear deformation, Finite Elements in Analysis and Design, vol. 19, pp. 25-44, 1995.
  12. William H. Press, Saul A. Teukolsky, William T. Vetterling, Brian P. Flannery, Numerical Recipes in C: The Art of Scientific Computing, Cambridge University Press, 1993. ISBN: 0521431085
  13. J.S. Przemieniecki, Theory of Matrix Structural Analysis, Dover Press, 1985. ISBN: 0486649482
  14. Robert E. Sennett, Matrix Analysis of Structures, Waveland Press, 2000.ISBN: 1577661435
  15. S. Timoshenko and J.N. Goodier, Theory of Elasticity, 2nd ed., McGraw Hill, 1951.
  16. Ansel C. Ugural and Saul K. Fenster, Advanced Strength and Applied Elasticity, 3rd ed., Prentice-Hall, 1995. ISBN: 013137589X

Cite this work

Researchers should cite this work as follows:

  • Henri Gavin (2010), "Frame3DD,"

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