https://github.com/onsas/onsas

An Open Nonlinear Structural Analysis Solver for GNU-Octave or Matlab
https://github.com/onsas/onsas

computational-mechanics gmsh gnu-octave matlab nonlinear-dynamics paraview structural-analysis structural-engineering

Last synced: 7 months ago
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An Open Nonlinear Structural Analysis Solver for GNU-Octave or Matlab

• Host: GitHub
• URL: https://github.com/onsas/onsas
• Owner: ONSAS
• License: gpl-3.0
• Created: 2019-02-11T11:54:58.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2025-06-15T01:05:45.000Z (8 months ago)
• Last Synced: 2025-06-15T02:19:31.684Z (8 months ago)
• Topics: computational-mechanics, gmsh, gnu-octave, matlab, nonlinear-dynamics, paraview, structural-analysis, structural-engineering
• Language: MATLAB
• Homepage: http://www.onsas.org
• Size: 33.5 MB
• Stars: 68
• Watchers: 4
• Forks: 18
• Open Issues: 19
• Metadata Files:
  • Readme: README.md
  • License: COPYING
  • Citation: CITATION.cff

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README

          

# ONSAS: an Open Nonlinear Structural Analysis Solver for GNU-Octave/Matlab

![octave tests](https://github.com/ONSAS/ONSAS/actions/workflows/octave_docker_tests.yml/badge.svg)

![matlab tests](https://github.com/ONSAS/ONSAS/actions/workflows/matlab_tests_and_docs.yml/badge.svg)

[![codecov](https://codecov.io/gh/ONSAS/ONSAS/branch/master/graph/badge.svg)](https://codecov.io/gh/ONSAS/ONSAS)

[![Documentation](https://img.shields.io/badge/docs-latest-blue.svg)](https://onsas.github.io/ONSAS/dev/)

[![License](https://img.shields.io/badge/License-GPLv3-green.svg)](https://github.com/ONSAS/ONSAS/blob/master/COPYING)

[![Release](https://img.shields.io/github/v/release/ONSAS/ONSAS?color=yellow&include_prereleases)](https://github.com/ONSAS/ONSAS/releases)

[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.15290486.svg)](https://zenodo.org/badge/latestdoi/170120732)

## About ONSAS 

ONSAS is a [GNU-Octave](https://www.gnu.org/software/octave/)/Matlab code for static/dynamic and linear/non-linear analysis of structures. The first version was developed for educational purposes and was published in a [handbook](https://www.colibri.udelar.edu.uy/jspui/bitstream/20.500.12008/22106/1/Bazzano_P%c3%a9rezZerpa_Introducci%c3%b3n_al_An%c3%a1lisis_No_Lineal_de_Estructuras_2017.pdf) of the course _Análisis no lineal de Estructuras_ taught at [Facultad de Ingeniería](https://www.fing.edu.uy/), Universidad de la República since 2017.

## Some examples

### A deployable ring

![ring](https://github.com/ONSAS/ONSAS/blob/master/docs/src/assets/deployableRing.gif?raw=true)

### A propeller model

![propeller](https://github.com/ONSAS/ONSAS/blob/master/docs/src/assets/propeller.gif?raw=true)

### A truss tower model

![tower](https://github.com/ONSAS/ONSAS_docs/blob/master/gifs/tower.gif?raw=true)

## Contact 

You can publicly post in the [discussion section](https://github.com/ONSAS/ONSAS/discussions) or contact privately sending an e-mail to _jorgepz [AT] fing.edu.uy_ .

## License

The code is distributed under a GNU-GPL 3.0 license.

## How to use ONSAS 

The user should follow these steps to install and run onsas:

1. Download and install [GNU-Octave](https://www.gnu.org/software/octave/) and [Paraview](https://www.paraview.org/)

1. Download the ONSAS zip source files from the realeases web https://github.com/ONSAS/ONSAS/releases

1. Open GNU-Octave, move to the _examples_ directory and run one of the examples.

An introduction to using and contributing to ONSAS was presented in 2022. The recording is available at [this youtube video](https://www.youtube.com/watch?v=tkJAD4UDvfI).

## Contributions 

The complete list of authors of code, contributions, affiliations and acknowledgments is available [in the documentation](https://onsas.github.io/ONSAS/dev/#Authors).