🌉 Masonry Arch Bridge: Thrust Line, Voussoirs and Safe Loading

Drag a load cart across a stone arch bridge and watch the line of thrust move through the voussoirs: Heyman's safe theorem, geometric factor of safety t/t_min (0.1075 R for a semicircle under self-weight), critical hinges, abutment thrust H and pier checks for semicircular, pointed and segmental arches.

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install