# Section Property Calculator

> Cross-sectional property calculation skill for structural sections including standard and custom shapes

- Skill: `a5c-ai/section-property-calculator` (Agent Skill)
- Install (CLI): `npx skillmds@latest add a5c-ai/section-property-calculator`
- Raw SKILL.md: https://api.skillmd.com/api/skills/a5c-ai/section-property-calculator/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: a5c-ai (https://skillmd.com/u/a5c-ai)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/a5c-ai/section-property-calculator

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# Section Property Calculator Skill

## Purpose

The Section Property Calculator Skill calculates cross-sectional properties for structural sections including area, moment of inertia, section modulus, and plastic modulus for both standard and custom shapes.

## Capabilities

- Calculate cross-sectional properties (A, I, S, Z, r)
- Support for standard shapes (W, HSS, C, L, pipe)
- Custom section analysis
- Composite section properties
- Cracked section analysis for concrete
- Plastic section modulus calculation
- Effective section properties
- Built-up section analysis

## Usage Guidelines

### When to Use
- Determining section properties for design
- Analyzing composite sections
- Evaluating cracked concrete sections
- Designing built-up members

### Prerequisites
- Section geometry defined
- Material properties specified
- Cracking criteria established (for concrete)
- Effective width defined (for composites)

### Best Practices
- Use correct axis orientation
- Account for holes and penetrations
- Consider effective sections per code
- Verify against published values

## Process Integration

This skill integrates with:
- Reinforced Concrete Design
- Structural Steel Design
- Bridge Design LRFD

## Configuration

```yaml
section-property-calculator:
  standard-shapes:
    - W-shapes
    - HSS-rectangular
    - HSS-round
    - channels
    - angles
    - pipes
  analysis-types:
    - gross
    - net
    - effective
    - cracked
```

## Output Artifacts

- Section property tables
- Cross-section drawings
- Calculation summaries
- Composite section analysis