> ## Documentation Index
> Fetch the complete documentation index at: https://calcs.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# US-based Calculations

> Structural engineering calculations based on US codes and standards (AISC, ACI, NDS)

# 🇺🇸 US-based Structural Calculations

Welcome to the US-based calculations section. Here you'll find comprehensive documentation and examples for structural calculations based on US codes and standards including AISC 360, ACI 318, NDS 2018, and ASCE 7.

## 🚀 Quick Start

<CardGroup cols={3}>
  <Card title="Getting Started" icon="rocket" href="/quickstart">
    Learn the basics of using Calcs.com
  </Card>

  <Card title="Worked Examples" icon="book-open" href="/calculations/us/worked_example__steel_beam_to_aisc_360_16">
    See real-world design examples
  </Card>

  <Card title="Project Defaults" icon="sliders" href="/calculations/us/project_defaults_us">
    Configure default values for US projects
  </Card>
</CardGroup>

## 📐 Calculation Modules

### Beams

<CardGroup cols={3}>
  <Card title="Wood Beams" icon="tree" href="/calculations/us/how_to_design_a_wood_beam_to_nds_2018__asd_and_lrfd_">
    Design wood beams, joists, and rafters to NDS 2018
  </Card>

  <Card title="Steel Beams" icon="grip" href="/calculations/us/how_to_design_a_steel_beam_to_aisc_360_16__asd_and_lrfd_">
    Design steel beams to AISC 360-16 (ASD & LRFD)
  </Card>

  <Card title="Concrete Beams" icon="building" href="/calculations/us/how_to_design_a_rectangular_concrete_beam_to_aci_318_14">
    Design concrete beams to ACI 318-14
  </Card>

  <Card title="Cold-Formed Steel" icon="layer-group" href="/calculations/us/how_to_design_a_cold_formed_steel_beam_to_aisi_s100_16_csa_s136_16">
    Design cold-formed steel beams to AISI S100-16
  </Card>

  <Card title="Deck Design" icon="home" href="/calculations/us/how_to_design_a_deck_with_calcs">
    Complete deck design series
  </Card>

  <Card title="Flitch Beams" icon="link" href="/calculations/us/flitch_beam_design">
    Design composite wood-steel flitch beams
  </Card>
</CardGroup>

### Columns

<CardGroup cols={2}>
  <Card title="Wood Columns" icon="columns" href="/calculations/us/how_to_design_a_wood_column_to_nds_2018">
    Design wood columns to NDS 2018
  </Card>

  <Card title="Concrete Columns" icon="building" href="/calculations/us/concrete_column_calculator_to_aci_318_19_overview">
    Design concrete columns to ACI 318-19
  </Card>
</CardGroup>

### Foundations & Retaining Walls

<CardGroup cols={3}>
  <Card title="Spread Footings" icon="square" href="/calculations/us/how_to_design_a_spread_footing_to_aci_318_14">
    Design spread footings to ACI 318-14
  </Card>

  <Card title="Cantilever Retaining Walls" icon="wall" href="/calculations/us/cantilever_retaining_wall_overview">
    Design cantilever retaining walls
  </Card>

  <Card title="Restrained Retaining Walls" icon="shield" href="/calculations/us/restrained_retaining_wall_overview">
    Design restrained basement walls
  </Card>
</CardGroup>

### Walls & Slabs

<CardGroup cols={2}>
  <Card title="Wood Shear Walls" icon="shield" href="/calculations/us/how_to_design_a_wood_shear_wall">
    Design wood shear walls
  </Card>

  <Card title="Diaphragm Analysis" icon="chart-area" href="/calculations/us/how_to_use_the_diaphragm_analysis_calculator">
    Analyze diaphragms and shear walls
  </Card>
</CardGroup>

### Load Calculations

<CardGroup cols={3}>
  <Card title="Wind Loads" icon="wind" href="/calculations/us/wind_loads__asce_7_16____mwfrs_overview">
    Calculate wind loads per ASCE 7-16
  </Card>

  <Card title="Seismic Analysis" icon="wave-square" href="/calculations/us/worked_example__seismic_analysis_to_asce_7_16">
    Seismic analysis to ASCE 7-16
  </Card>

  <Card title="Snow Loads" icon="snowflake" href="/calculations/us/us_snow_loads_calculator_worked_example">
    Calculate snow loads
  </Card>
</CardGroup>

### General Analysis

<CardGroup cols={3}>
  <Card title="Beam Analysis" icon="ruler-combined" href="/calculations/general_analysis_calculations/how_to_use_the_beam_analysis_calculator">
    General beam analysis and design
  </Card>

  <Card title="Portal Frames" icon="sitemap" href="/calculations/general_analysis_calculations/how_to_analyse_a_portal_frame_in_calcs">
    Analyze portal frames
  </Card>

  <Card title="Truss Analysis" icon="project-diagram" href="/calculations/general_analysis_calculations/how_to_use_the_truss_analysis_wizard">
    Analyze trusses with the wizard
  </Card>
</CardGroup>

## 📚 Popular Guides

<CardGroup cols={2}>
  <Card title="ASD vs LRFD" icon="balance-scale" href="/learn_calcs/faq/asd_and_lrfd_calculations">
    Understanding ASD and LRFD design methods
  </Card>

  <Card title="Building Codes & Load Combinations" icon="book" href="/learn_calcs/faq/building_codes___load_combinations_in_the_united_states">
    US building codes and load combination requirements
  </Card>
</CardGroup>

## 🔍 Browse by Category

Use the navigation menu on the left to explore all available calculation modules organized by:

* **Beams** - Wood, Steel, Concrete, Cold-Formed Steel
* **Columns** - Wood, Steel, Concrete
* **Foundations & Retaining Walls** - Footings, Retaining Walls
* **Walls & Slabs** - Shear Walls, Diaphragms
* **Loads** - Wind, Seismic, Snow
* **General Analysis** - Portal Frames, Trusses, Custom Analysis

## 💡 Need Help?

<CardGroup cols={2}>
  <Card title="FAQ" icon="circle-question" href="/learn_calcs/faq/common_errors_and_how_to_fix_them">
    Find answers to common questions
  </Card>

  <Card title="Contact Support" icon="headset" href="/contact_us">
    Get help from our support team
  </Card>
</CardGroup>