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Short, visual, source-cited explainers behind the tools — most with an interactive or diagram.

Structural intuition

A visual walk through how buildings carry load — beams, columns, arches, trusses.

How Beams Work: Bending, Shear, and the Deflected Shape
beginner
A visual, no-math intro to why beams bend, where they're strongest and weakest, and why a cantilever flips tension to the top. Interactive.
Load Paths: How a Building Carries Weight to the Ground
beginner
Every load needs an unbroken path to the ground — slab to beam to column to footing to soil. A visual primer on thinking in load paths.
Why Joists Stand on Edge: Moment of Inertia, Visually
beginner
A 2×10 on edge is 25× stiffer than the same board laid flat. Here's the why — moment of inertia and why depth (cubed) dominates. Interactive.
How Columns Buckle: Length, End Conditions, and Euler
intermediate
Slender columns fail by buckling, not crushing. See how length and end fixity set the critical load — Euler's Pcr = π²EI/(KL)². Interactive.
How Trusses Work: Tension, Compression, and the Method of Joints
beginner
Why a truss is light yet strong: every member is in pure tension or compression. Read the pattern, then try a free interactive solver.
Arches & Funicular Form: How a Hanging Chain Becomes an Arch
intermediate
Hang a chain and it finds pure tension; invert it for an arch in pure compression. Catenary vs parabola, and the thrust trade-off. Interactive.

Reference & how-to

Plain-language, source-cited explainers that pair with the calculators.