Geometrically Exact Beam Theory

By Wenbin Yu1, Qi Wang2

1. Purdue University 2. National Renewable Energy Laboratory

A General-Purpose Nonlinear Analysis Tool for Composite Beams Considering All Elastic Couplings

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Version 4.8 - published on 14 Aug 2014

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Geometrically Exact Beam Theory (GEBT), is a general-purpose tool for nonlinear analysis of composite slender structures, meeting the design challenges associated with future engineering systems featuring highly-flexible slender structures made of composites. GEBT is based on the mixed formulation of the geometric exact beam theory which can capture all geometric nonlinearities due to large deflections and rotations, subject to the strains being small. Coupled with Variational Beam Sectional Analysis (VABS), a general-purpose cross-sectional analysis, GEBT can effectively analyze geometric nonlinear behavior of slender structures having arbitrary cross-sections made of arbitrary materials.

Currently no GUI is available for this tool, first you need to map webdav as a network drive according to the instruction given in the knowledge. Then put gebt inputs files into that drive. Then you can directly type gebt input_file to execute the code. If you put all your files in a directory, say gebtdata, then you need to type cd gebtdata, then type gebt input_file to execute the code.Please refer to the user manual regarding how to prepare input file for GEBT. Several examples are provided in the examples.ppt  file along with the input files in

The most recent version update the code to use the Wiener-Milenkovic parameters. The details of the formulation can be found in the conference paper in the supporting documents. 


Cite this work

Researchers should cite this work as follows:

    1. Yu, W. and Blair, M.: "GEBT: A General-Purpose Nonlinear Analysis Tool for Composite Beams," Composite Structures, vol. 94, 2012, pp. 2677-2689.
    2. Wang, Q.; Yu, W.; Sprague, M. A. and Jonkman, J.: "Geometric Nonlinear Analysis of Composite Beams using Wiener-Milenkovic Parameters," Proceedings of the 54th Structures, Structural Dynamics, and Materials Conference , Boston, Massachusetts, Apr. 8-11, 2013.
  • Wenbin Yu; Qi Wang (2014), "Geometrically Exact Beam Theory,"

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