Nonlinear finite element analysis.

xara is a Python package that provides an intuitive and performant API for nonlinear finite element analysis, implemented in C++ through the OpenSeesRT framework. OpenSees features state-of-the-art finite element formulations and solution algorithms, including mixed formulations for beams and solids, over 200 material models, and an extensive collection of continuation algorithms to solve highly nonlinear problems.

This package may be used as a drop-in replacement for both OpenSees.exe and OpenSeesPy (see Getting Started below), and generally provides a substantial performance boost.

The xara package can be installed into a Python environment in the standard manner. For example, using pip:

pip install xara

There are several ways to use the xara package:

• To execute Tcl procedures from a Python script, just create an instance of the xara.M 83C8 odel class and call its eval() method:

  model = xara.Model()
  model.eval("model Basic -ndm 2")
  model.eval("print -json")

• To start an interactive interpreter run the shell command:

  python -m opensees

  To quit the interpreter, just run exit:

  opensees > exit

• The xara package exposes a compatibility layer that exactly reproduces the OpenSeesPy functions, but does so without mandating a single global program state. To run OpenSeesPy scripts, just change the import:

  import openseespy.opensees

  to

  import opensees.openseespy

  For true stateless modeling, the Model class should be used instead of the legacy model function; see the documentation here.

To compile the project see about/compiling