AISIS100.cs

AISI S100 cold-formed steel design equations, implemented as a .NET library.

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The Problem

Cold-formed steel design is still largely implemented in spreadsheets. Each project requires re-creating AISI S100 equations — often in workbooks that are difficult to audit, extend, or reuse, with limited transparency into how results are produced.

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What It Does

AISIS100.cs implements the AISI S100 North American Specification for the Design of Cold-Formed Steel Structural Members as a .NET class library.

• Covers tension, compression, flexure, shear, combined loading, connections, and distortional buckling
• Returns both nominal strength and available strength (ASD, LRFD, LSD)
• Includes an Output object that captures intermediate calculations and specification references at every step

Three editions are currently supported:

Edition	Design Methods
AISI S100-16	ASD, LRFD, LSD
AISI S100-16 Supplement 3	ASD, LRFD, LSD
AISI S100-24	ASD, LRFD, LSD

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Installation

NuGet Package Manager:

Install-Package AISIS100.cs

.NET CLI:

dotnet add package AISIS100.cs

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Quick Start

using AISIS100;

var output = new Output();

double My   = 50.0;  // kip-in, yield moment
double Mcrd = 28.0;  // kip-in, critical elastic distortional buckling moment

double Mnd  = ChapterFFlexure.DistortionalBucklingStrengthMnd(My, Mcrd, output);
double aMnd = ChapterFFlexure.AvailableDistortionalBucklingStrengthMnd(Mnd, "LRFD", output);

Console.WriteLine($"Nominal:          {Mnd:F2} kip-in");
Console.WriteLine($"Available (LRFD): {aMnd:F2} kip-in");

Nominal:          31.26 kip-in
Available (LRFD): 28.13 kip-in

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Documentation

Full API reference: runtosolve.github.io/AISIS100.cs

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License

This project is licensed under the MIT License.