SGIO

Structure Gene (SG) I/O

Python package interfacing VABS and SwiftComp. The package is developed based on meshio, which is used for converting meshing data.

Features

The package can be used to:

• Read/write SG data from/to different formats
• Convert SG/mesh data between different formats
• Read structural property from VABS/SwiftComp output
• Create 1D SG from layup input

Supported Data Formats

• For complete SG data:
  • VABS, SwiftComp, Abaqus
• For mesh data only:
  • All formats supported by meshio

A structure gene (SG) is defined as the smallest mathematical building block of a structure.¹ A cross-section (CS) is a type of 2D SG.

Online documentation

Installation

Option 1: Install via pip (Recommended)

pip install sgio

Option 2: Standalone Executable (No Python Required)

Download and use the pre-built standalone executable that requires no Python installation:

1. Download the latest executable from the releases page
2. Run directly from command line:

   # Windows
   sgio.exe --help
   
   # Linux/macOS
   ./sgio --help
   

Option 3: Build Your Own Executable

Build a standalone executable from source:

# Windows
build_executable.bat

# Linux/macOS
./build_executable.sh

# Or manually
python build_executable.py

See BUILD_EXECUTABLE.md for detailed instructions.

Option 4: Manual Installation

1. Download the package.
2. Install dependencies:

   pip install -r <INSTALL_DIR>/sgio/requirements.txt
   

3. Configure environment variables:
   • Add the package root directory to PYTHONPATH.
   • Add <INSTALL_DIR>/sgio/bin to PATH.

Usage

API

Example: Read Beam Properties from VABS Output File

import sgio

model = sgio.readOutputModel('my_cross_section.sg.k', 'vabs', 'BM1')

Command Line Interface

Example: Convert Cross-Sectional Data from Abaqus (.inp) to VABS Input

Suppose a cross-section has been built in Abaqus and output to cross-section.inp. To convert the data to the VABS input (Timoshenko model) cross-section.sg:

python -m sgio convert cross-section.inp cross-section.sg -ff abaqus -tf vabs -m bm2

Complete Options

usage: sgio [-h] [-v] {build,b,convert,c} ...

I/O library for VABS (cross-section) and SwiftComp (structural gene)

positional arguments:
  {build,b,convert,c}  sub-command help
    build (b)          Build 1D SG
    convert (c)        Convert CS/SG data file

optional arguments:
  -h, --help           show this help message and exit
  -v, --version        Show version number and exit

Convert SG Data

usage: sgio convert [-h] [--loglevelcmd {debug,info,warning,error,critical}]
                    [--loglevelfile {debug,info,warning,error,critical}] [--logfile LOGFILE]      
                    [-ff FROM_FORMAT] [-ffv FROM_FORMAT_VERSION] [-tf TO_FORMAT]
                    [-tfv TO_FORMAT_VERSION] [-d {1,2,3}] [-ms {x,y,z,xy,yz,zx}] [-mry {x,y,z}]   
                    [-m {sd1,pl1,pl2,bm1,bm2}] [-mo] [-re]
                    from to

positional arguments:
  from                  CS/SG file to be read from
  to                    CS/SG file to be written to

optional arguments:
  -h, --help            show this help message and exit
  --loglevelcmd {debug,info,warning,error,critical}
                        Command line logging level
  --loglevelfile {debug,info,warning,error,critical}
                        File logging level
  --logfile LOGFILE     Logging file name
  -ff FROM_FORMAT, --from-format FROM_FORMAT
                        CS/SG file format to be read from
  -ffv FROM_FORMAT_VERSION, --from-format-version FROM_FORMAT_VERSION
                        CS/SG file format version to be read from
  -tf TO_FORMAT, --to-format TO_FORMAT
                        CS/SG file format to be written to
  -tfv TO_FORMAT_VERSION, --to-format-version TO_FORMAT_VERSION
                        CS/SG file format version to be written to
  -d {1,2,3}, --sgdim {1,2,3}
                        SG dimension (SwiftComp only)
  -ms {x,y,z,xy,yz,zx}, --model-space {x,y,z,xy,yz,zx}
                        Model space
  -mry {x,y,z}, --material-ref-y {x,y,z}
                        Axis used as the material reference y-axis
  -m {sd1,pl1,pl2,bm1,bm2}, --model {sd1,pl1,pl2,bm1,bm2}
                        CS/SG model
  -mo, --mesh-only      Mesh only conversion
  -re, --renumber-elements
                        Renumber elements

Check out the example examples/convert_cs_from_abaqus_to_vabs for more details.

License

This project is licensed under the MIT License. See the LICENSE file for details.

Reference