🌉 Bridge Builder Junior 2D: Truss, Arch and Suspension Load Test

Draw a pin-jointed truss, tied arch or suspension bridge on a side-view canvas and roll an 8-tonne test truck across it. A direct-stiffness solver with tension-only cables, Euler buckling and method-of-joints readouts colours every beam green to red and plots beam force and sag against truck position.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install