STRESS RIBBON BRIDGE

INTRODUCTION

A stress ribbon bridge is a tension structure, similar in many ways to a simple suspension bridge. The suspension cables are embedded in the deck which follows a catenary arc between supports. Unlike the simple span the ribbon is stressed in compression which adds to the stiffness of the structure. Such bridges are typically made from concrete reinforced by steel tensioning cables. They are used mainly for pedestrian and cycling traffic. Stress ribbon bridges are very economical, aesthetic and almost maintenance free structure. They require minimal quantity of materials.


Fig: Components of a Stressed Ribbon Bridge

Advantages
  • Stress ribbon pedestrian bridges are very economical, aesthetical and almost maintenance free structures.
  • They require minimal quantity of materials.
  • They are erected independently from existing terrain and therefore they have a minimum impact upon the environment during construction.
  • They are quick and convenient to construct if given appropriate conditions, without false work. 
  • A stress ribbon bridge allows for long spans with a minimum number of piers and the piers can be shorter than those required for cable stayed or suspension bridges.
Examples of stress Ribbon Bridge:


Lake Hodges Pedestrian Bridge

Leonel Viera Bridge

Phyllis J. Tilley Memorial Bridge


Rogue river pedestrian Bridge


Terwilliger Park foot Bridge

CONCLUSION

Stress ribbon bridges are a versatile form of bridge, the adaptable form of structure is applicable to a variety of requirements. The slender decks are visually pleasing and have a visual impact on surroundings giving a light aesthetic impression. Post tensioned concrete minimizes cracking and assures durability. Bearings and expansion joints are rarely required minimizing maintenance and inspections.

There are also advantages in construction method, since erection using pre-cast segments does not depend on particular site condition and permits labour saving erection and a short time to delivery. Using bearing tendons can eliminate the need for site form work and large plant, contributing to fast construction programmes and preservation of the environments. There is a wide range of different topographies and soil conditions found and a number of areas which require aesthetic yet cost effective pedestrian bridges to be built: Stress ribbon bridges could provide elegant solutions to these challenges.




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