Structural analysis solvers tailored for semi-analytical models

Linear statics: [K]{u} = {f}
Eigensolver for Linear buckling: ([K] + lambda[KG]){u} = 0
Eigensolver for dynamics: ([K] + lambda^2[M]){u} = 0
Nonlinear statics using Newton-Raphson
Nonlinear statics using the Arc-Length method

Currently these solvers are pretty much compatible with my other repositories panels, buckling.

Citing this library

Saullo G. P. Castro (2026). Structural analysis solvers tailored for semi-analytical models (Version 0.4.0). Zenodo. DOI: https://doi.org/10.5281/zenodo.2581212.

Documentation

The documentation is available on: https://saullocastro.github.io/structsolve.

History

See CHANGELOG.md for the details of each version.

version 0.4.0 (2026-09-17)
- Newton-Raphson with full Newton iterations and a relative convergence criterion by default, reaching quadratic convergence with exact tangent stiffness matrices
- Fixed the load-factor bookkeeping of Newton-Raphson, which could finish before reaching the full load
- Arc-length methods (Riks and Crisfield) rewritten, able to trace limit points, snap-through and snap-back until a load factor of exactly 1.0
- Sphinx documentation
version 0.3.1 (2026-04-09)
- Robust estimation of the eigenvalue shift for singular matrices in freq and lb, and new skip_null_cols argument
- Python 3.14 support
- Estimation of the eigenvalue shift in freq and lb
- Packaging with pyproject.toml, GitHub Actions and a test suite
version 0.2.2 (2019-03-02)
- Release of 0.2.1 with an updated distribution
- Fixed the dense solver of freq
- freq returns the eigenvalues lambda**2 instead of the natural frequencies
version 0.1.0 (2018-06-23)
- First release, with the solvers from compmech

License

Distributed in the 3-Clause BSD license (https://raw.github.com/saullocastro/structsolve/master/LICENSE).

Contact: S.G.P.Castro@tudelft.nl

Metadata

Release files for structsolve 0.4.0

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Source distribution (sdist)

Source distribution for structsolve 0.4.0
File	Size	Uploaded
structsolve-0.4.0.tar.gz	27.7 kB	Sep 17, 2026	Details

Built distribution (wheel)

Table of built distributions (wheels) for structsolve 0.4.0
File	Interpreter	ABI	Platform	Reset
structsolve-0.4.0-py3-none-any.whl 24.3 kB Sep 17, 2026	Python 3	none	any	Details

Total release size: 52.0 kB

Release files / structsolve-0.4.0.tar.gz

Download URL	structsolve-0.4.0.tar.gz
Size	27.7 kB
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SHA-256 checksum How to use checksums	`076b1448cf6cd65f3ca5e1c9a52c62fd3c3d7d8b35d83bfd3ea98445ff5a2a33`
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Download URL	structsolve-0.4.0-py3-none-any.whl
Size	24.3 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`e7d8087dd8bd4f4f8a6452e267418d8c68d29f3242b767d471bb8301fe09ef33`
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