Form finding of the Salginatobel bridge
The design of the Salginatobel bridge is based on the superposition of the thrust lines for two load cases. The self-weight of the bridge is assumed as a uniformly distributed load; two point loads are assumed at quarter span of the bridge. Use the slider to go through the steps of the formfinding process: 1-3) constructing the thrust line for the uniformly distributed load; 4-5) constructing the thrust line for the two point loads at quarter span; 6) constructing a moving point load; 7-9) integrating the two loadlines into a combined load line to construct the thrust line for the combined load case.
Use the slider to move the point load along the span of the bridge. Note that the found thrust line is always contained within the geometry of the bridge.