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Armatura

Armatura is a structural frame analysis framework for .NET. It provides a complete pipeline from model definition through FEM analysis to design code assessment, available both as a C# API and as a desktop editor with a 3D viewport.

What Armatura does​

  • Model building — define nodes, members, supports, materials, sections, and loads programmatically or through the visual editor
  • Load management — dead, live, wind, snow, seismic, and ice load cases with Eurocode-compatible load combinations
  • FEM analysis — linear elastic frame analysis using a 3D beam element formulation verified against CALFEM 3.6
  • Results — nodal displacements, reactions, member internal forces at configurable stations, envelope queries across all load cases and combinations
  • Design checks — member utilization ratios against structural design codes (Eurocode 3, with AISC 360 and AS4100 planned)

Two ways to use it​

As a library​

var model = new StructuralModel("My Bridge");

var n1 = model.AddNode(0, 0, 0);
var n2 = model.AddNode(10, 0, 0);
model.SetSupport(n1, DoF.Fixed);
model.SetSupport(n2, DoF.Pinned);

var beam = model.AddMember(n1, n2, SteelLibrary.S355, 
    new IBeamSection("IPE 300"), MemberType.Beam);

var dead = new DeadLoadCase("Dead");
model.AddLoadCase(dead);
model.AddDistributedLoad(new UniformDistributedLoad(dead, beam, 
    new Point3D(0, -5000, 0)));

var results = model.RunAnalysis();
var maxDeflection = results.GetDisplacementEnvelope(n2.Id).Dy.Min;

As a desktop editor​

The Armatura Editor is an Avalonia-based desktop application with a real-time OpenGL viewport, collapsible panels, and data tables for inspecting model input and analysis results.

Architecture​

SamLabs.Armatura.Core       — structural model, loads, results, design codes
SamLabs.Armatura.Engine      — ECS rendering engine, tools, commands
SamLabs.Armatura.Editor      — Avalonia desktop application
SamLabs.FemFrame             — FEM solver (beam elements, stiffness method)

The Core library has no dependency on the Engine or Editor — it can be used standalone in console applications, web services, or automated pipelines.