A structural engineering simulator where you design real truss bridges and stress-test them with increasingly heavy vehicles — from a bicycle to a 200-ton train.
Verlet integration with iterative constraint relaxation — the same method used in game physics engines. Beams genuinely sag, bend, and fail under load.
Every beam is tracked for its structural mode — blue = tension, orange = compression. Toggle the Force Diagram to see real load paths through your structure.
Multiple vehicles cause oscillation that builds over time. Push it far enough and you'll witness a Tacoma Narrows–style resonance collapse.
One click generates a printable technical report with material breakdown, stress analysis, cost efficiency, and structural notes — ready to submit.
Export per-beam stress data as a spreadsheet after every test. Analyze results in Excel or Python for deeper insights.
Four structured engineering lessons walk you through core concepts — from why beams sag, to truss geometry, to material selection.
Drag beams between anchor points. Use screws to add junction points anywhere along a beam.
Hit Test Bridge, then spawn vehicles. Watch stress colors build from neutral → amber → red → snap.
Click any beam to inspect it. Use Force Diagram to see tension/compression. Generate a full report.
Replay the failure, identify weak points, rebuild. Compare two designs side by side.
No download. No account. Works in any modern browser.