📐 AnySection – Reinforced Concrete Section Analysis

📊 Overview

AnySection is a Python library for reinforced concrete section analysis. It provides tools for modeling, analyzing, and visualizing the structural behavior of reinforced concrete sections using material nonlinearities and fiber-based analysis methods.

Key features include:

• ✅ Support for Concrete_NonlinearEC2 and Steel_Bilinear material models.
• ✅ Fiber-based moment-curvature analysis.
• ✅ Calculation of axial forces, bending moments, and neutral axis positions.
• ✅ Generate moment-curvature diagrams and plot section views.
• ✅ Extensible architecture for adding custom materials and solvers.

📁 Project Structure

AnySection/
│
├── anysection/              # Main package
│   ├── __init__.py
│   ├── geometry/            # Geometrical objects (Area, Fiber, Points)
│   │   └── area.py
│   │
│   ├── materials/           # Material models
│   │   └── material.py
│   │
│   ├── sections/            # Section definitions and properties
│   │   └── section.py
│   │
│   ├── solvers/             # Section analysis solvers
│   │   └── section_solver.py
│   │
│   └── utils/               # Utility classes (constants, helpers)
│       └── globals.py
│
├── examples/                # Example usage
│   └── example1.py
│
├── setup.py                 # Build configuration
├── requirements.txt         # Dependencies
├── README.md                 # 📖 You are here
└── LICENSE                   # MIT License

⚙️ Installation

🔹 1. Clone the Repository

git clone https://github.com/yourusername/anysection.git
cd anysection

🔹 2. Install Dependencies

pip install -r requirements.txt

🔹 3. Install the Library Locally

pip install -e .

This installs the package in editable mode for local development.

🧮 Quick Start Example

import matplotlib.pyplot as plt
import numpy as np
from anysection.materials import Concrete_NonlinearEC2, Steel_Bilinear
from anysection.sections import Section
from anysection.solvers import SectionSolver

# Define Materials
concrete = Concrete_NonlinearEC2(fcm=20e6, ec1=0.002, ecu1=0.0035)  # C20/25 Concrete
steel = Steel_Bilinear(Es=200e9, fy=500e6)  # Reinforcement Steel

# Create a Section
section = Section("Rectangular Beam")
section.add_fiber(area=0.01, x=0.0, y=0.0, material=concrete)
section.add_fiber(area=0.01, x=0.1, y=0.0, material=concrete)
section.add_fiber(area=0.01, x=0.0, y=0.1, material=concrete)
section.add_fiber(area=0.01, x=0.1, y=0.1, material=concrete)

# Initialize Solver
solver = SectionSolver(section)

# Analyze Moment-Curvature
curvatures = np.linspace(0, 0.02, 100)
moments = [solver.calculate_moment_capacity(c) for c in curvatures]

# Plot Moment-Curvature Diagram
plt.plot(curvatures, moments)
plt.xlabel('Curvature (1/m)')
plt.ylabel('Moment (Nm)')
plt.title('Moment-Curvature Diagram')
plt.grid(True)
plt.show()

📐 Features

🏗️ Section Modeling: Fiber-based section modeling for reinforced concrete.

📊 Moment-Curvature Analysis: Plot moment-curvature behavior for reinforced sections.

📏 Material Models:

• Concrete_NonlinearEC2 (Nonlinear EC2 behavior for concrete)

• Steel_Bilinear (Bilinear elastic-plastic model for reinforcement)

📈 Customizable Solvers: Easily extend the library with new solvers and materials.

🛠️ Contributing

Contributions are welcome! 🚀 Feel free to fork the repository, submit issues, and create pull requests.

📢 To contribute:

Fork the repository.
Create a new branch: git checkout -b feature/my-feature
Commit your changes: git commit -m 'Add new feature'
Push to the branch: git push origin feature/my-feature
Open a Pull Request ✅

📄 License

This project is licensed under the MIT License.

🌐 Links

📚 Documentation: Coming Soon

🐛 Issue Tracker: GitHub Issues

🏗️ PyPI: Coming Soon

Citation: If you use AnySection in your research, please cite the following paper:

Papanikolaou, Vassilis. (2019). AnySection : Software for the analysis of arbitrary composite sections in biaxial bending and axial load.