Simple_suspension_bridge

Simple suspension bridge

''This article is concerned with a particular type of suspension bridge, the simple suspension type.
For an index to the several types see suspension bridge types.

A simple suspension bridge is an early bridge type and is still formed from native materials, chiefly rope, in some areas of South America. These rope bridges must be periodically renewed owing to the limited lifetime of the materials, and rope components are made and contributed by families as contributions to a community endeavor.

A more permanent variation, suitable for pedestrian and sometimes equestrian use, may be made from simple wire rope. In such bridges, the roadbed of the bridge will follow the downward and upward arc of the load bearing cables, with additional light ropes at a higher level used to form hand-holds. Owing to practical limitation in the grade and the response to dynamic loads of the bridge deck, this type is quite restricted in its load-carrying capacity relative to its span.

To walk a lighter bridge of this type at a reasonable pace requires a particular gliding step, as the more normal walking step will induce traveling waves that can cause the traveler to pitch (uncomfortably) up and down or side-to-side. Such a bridge may be stabilized by additional cables that do not bear the primary structural or live loads and so may be relatively light. These also add stability in wind. In the bridge shown at upper right the primary supports form the handrails with the deck suspended below. This makes for more motion side-to-side in the walkway than when the primary supports are at deck level.

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