Bridges:
Tensile bridges are the largest clear span structures in the world.In the following diagrams, only the white struts are intended to be capable of sustaining compressive loads - all other elements are tensile.
Hexagonal Geodesic Domes - Bridges
HEXDOME
The hyperboloid is a simple tensile structure, which I believe has - or should have - substantial significance for bridge builders.
The hyperboloid is one of the two "doubly ruled" structures. Its surface consits entirely of straight lines, the roles of which can be conveniently played by cables. The degree of central constriction can be varied - by placing cables at different angles.
Practical constructions often consist of two sets of cables - one twisting to the left, the other twisting to the right.
The cables can be woven togther, using rectangular or triaxial weaving patterns.
Also, the two sets of cables can sometimes be placed at slightly different angles to the main axis of the bridge - so that neither set of cables is quite straight. This causes the two concentric sets of cables to press into each other dynamically.
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