🌉 Cast-Iron Arch Bridge: Thrust, Rise Ratio, Partial Loading and Rib Stress (2D elevation)

Elevation of a three-hinged cast-iron arch bridge. Use the span, mass and added deck load of the 3D bridge, then change the rise, cover only part of the span, and watch the thrust line, bending moment, bank reactions and rib stress. Four in-page numerical checks including the half-span q L squared over 64 moment.