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In the harp or parallel design, the cables are almost parallel so that the height of their connection to the tower is proportional to the distance from the tower to their mounting on the deck.
In the fan design, the cables all join to or pass over the top of the towers. The fan design is structurally better with minimum moment applied to the towers but for practical reasons the modified fan is preferred particularly where many cables are necessary. In the customized fan arrangement the cables terminate near to the top of the tower but are spaced from each other adequately to allow better termination, improved environmental protection, and good contact to individual cables for maintenance.
The cable-stayed bridge is most favorable for spans longer than cantilever bridges, and shorter than suspension bridges. This is the range where cantilever bridges would quickly grow heavier if the span were lengthened, and suspension bridge cabling would not be further economical if the span were reduced.
BRIDGE TENSION CABLES
A
cable-stayed bridge has one or more towers (or pylons), from which cables hold
up the bridge deck.
There
are four main classes of cable-stayed bridges: harp, mono, star and fan.
In the harp or parallel design, the cables are almost parallel so that the height of their connection to the tower is proportional to the distance from the tower to their mounting on the deck.
In the fan design, the cables all join to or pass over the top of the towers. The fan design is structurally better with minimum moment applied to the towers but for practical reasons the modified fan is preferred particularly where many cables are necessary. In the customized fan arrangement the cables terminate near to the top of the tower but are spaced from each other adequately to allow better termination, improved environmental protection, and good contact to individual cables for maintenance.
The cable-stayed bridge is most favorable for spans longer than cantilever bridges, and shorter than suspension bridges. This is the range where cantilever bridges would quickly grow heavier if the span were lengthened, and suspension bridge cabling would not be further economical if the span were reduced.
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