ACI 440.2R-17 FRP Strengthening Calculator

Web application for designing externally bonded FRP (Fiber-Reinforced Polymer) strengthening of RC beams and slabs per ACI 440.2R-17.

Features

Flexural Strengthening

• Full ACI 440.2R-17 flexural design with iterative neutral axis solver (20 iterations)
• Support for Carbon (CFRP), Glass (GFRP), and Aramid (AFRP) fiber types
• Environmental exposure conditions: Interior, Exterior, Aggressive
• Service stress checks (steel and FRP creep rupture)
• Detailed MathJax-rendered calculation report with all intermediate steps

Shear Strengthening

• ACI 440.2R-17 Chapter 11 shear design
• U-wrap (3 sides) and two-sided wrapping configurations
• Effective bond length, bond reduction factors, and strain calculations
• Combined shear capacity (FRP + concrete + steel)

General

• Interactive SVG beam cross-section diagram
• Summary cards with pass/fail indicators
• Tabbed interface (Flexural / Shear)
• Electron.js desktop app wrapper
• Railway-ready deployment (Docker)

Quick Start

Web (Development)

pip install -r requirements.txt
python app.py

Open http://localhost:5000

Electron (Desktop)

npm install
npm run electron

Railway Deployment

Push to GitHub and connect to Railway. It auto-deploys via the included Dockerfile.

Project Structure

├── app.py                 # Flask backend + calculation engines
├── templates/
│   └── index.html         # HTML frontend (separate for easy editing)
├── static/
│   ├── css/style.css      # Styling
│   └── js/
│       ├── app.js         # Tab switching, API calls, MathJax report builders
│       └── graphics.js    # SVG beam cross-section generator
├── electron/
│   └── main.js            # Electron.js desktop wrapper
├── package.json           # Node/Electron config
├── requirements.txt       # Python dependencies
├── Dockerfile             # Container build
├── Procfile               # Railway process definition
├── railway.toml           # Railway deployment config
└── skyciv/                # Original SkyCiv calculator (reference)

Tech Stack

• Backend: Python, Flask, gunicorn
• Frontend: HTML, CSS, JavaScript, MathJax
• Desktop: Electron.js
• Deployment: Docker, Railway

References

• ACI 440.2R-17: Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures
• ACI 318M-14: Building Code Requirements for Structural Concrete

License

MIT License - Albert Pamonag Engineering Consultancy