Truss & Frame — TrussOne

Structural analysis you can pull on. 45 screens, from a section's properties to a column's buckling load — every one of them live: drag an input and the numbers and the figure move together.

What it covers

Statics

Force Systems & Resultants · Support Reactions · Determinacy & Stability

Sections

Section Builder & Properties · Principal Axes & Inertia Circle · Shear Flow & Shear Centre · Plastic Section & Shape Factor

Stress & Strain

Axial Members · Plane Stress & Mohr's Circle · Strain Rosette · Elastic Constants · Yield Criteria · Thin-Walled Pressure Vessel

Beams

Beam Diagrams · Bending Stress · Transverse Shear Stress · Transformed Section · Combined Axial + Bending · Deflection — Standard Cases · Deflection — Integration · Energy Methods

Trusses & Frames

Truss — Joints & Coefficients · Force Diagram · Truss Displacements · Model Canvas · Linear Solve & Results · Elastic Supports & Foundation · Classical Methods

Torsion

Circular Shafts · Non-Circular & Thin-Walled Torsion · Combined Bending + Torsion

Stability

Euler Column & Effective Length · Column Strength Curve · Imperfect Columns · Eccentric Columns · Inelastic Buckling · Approximate Methods · Buckling of the Model · Beam-Columns · Frame Effective Length · Torsional & Lateral Buckling · Plate Buckling

Non-linear & Walls

Second-Order Analysis · Plastic Collapse · Gravity Retaining Wall

Why it is different from asking a chatbot

It is a family, not an answer. Change a number and watch the whole picture move. A single static answer cannot show you which way something is sensitive.
It shows you which relation produced each number. Every result names the relation beside it.
It says where it stops. Where a model is near the edge of its range, the app says so next to the number rather than after the fact.
It works with no network at all. On a plane, in an exam hall, in a basement lab.
Its workings are public. The theory manual lists every relation, every assumption and every limit.

How it was checked

Every relation is verified against sixty-digit reference values computed independently of the app, and the Apple and desktop implementations are compared against the same reference — 45 screens, both languages, one set of numbers.

Material data and reference values are taken from public-domain sources: Handbook of Structural Stability, Part I - Buckling of Flat Plates, Buckling Stresses of Simply Supported Rectangular Plates in Shear, Effective Width of Plates in Compression, A Unified Theory of Plastic Buckling of Columns and Plates, among others.

Read before you buy

Theory manual — every relation and its limits.
Usage manual — how a screen is laid out and what the conventions are.