spiderweb/suspension bridges

=suggestion =mech eng =construction



This is a bridge design I like. It's probably been devised before under a different name, but I call it a "spiderweb/suspension" bridge.




The suspension part is only worth using if there are good places to anchor the suspension cable tension. If not, or if using shorter spans, then a pure "spiderweb" design is better.

The upper cables of the vertical towers are clustered together to increase rigidity via force transfer between cables through the tower. Cables should be anchored to the vertical tower for rigidity, except for the topmost cable, but the angled towers have less flexural strength, so it's probably better to use cable saddles on the angled towers with separate (small) anchored cables to support the angled towers' weight. That should also be cheaper than using more cable anchors.

This design might be easier to understand if you think of each segment of the spiderweb supports as a compromise between a weight hanging from a cantilever and a cable-stayed bridge.




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