The Design of Prestressed Concrete Bridges: Concepts and Principles
Robert Benaim
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Concrete has been in use as a primary building material since Roman times. As it is strong in compression but weak in tension, it was used in arches, vaults and walls where it is stressed principally in compression. In the mid-nineteenth century, it was discovered that iron and later steel bars could be embedded in the concrete, effectively giving it tensile strength. This allowed it to be used in beams and slabs, where it worked in bending. Buildings, bridges, retaining walls and many other structures were made in this reinforced concrete. However, although it is one of the principal building materials in the world, it has shortcomings. Reinforced concrete beams and slabs defl ect signifi cantly under load, requiring stocky sections to provide adequate stiffness; as it defl ects it cracks which spoils its appearance and leaves the reinforcing bars vulnerable to corrosion; the large number of bars required to give the necessary strength to long span beams in bridges and buildings make it diffi cult to cast the concrete; it is labour intensive and slow to build.
- The nature of design
- Basic concepts
- Reinforced concrete
- Prestressed concrete
- Prestressing for statically determinate beams
- Prestressing for continuous beams
- Articulation of bridges and the design of substructure
- The general principles of concrete deck design
- The design of bridge deck components
- Precast beams
- Solid slabs, voided slabs and multi-cell box girders
- Ribbed slabs
- Box girders
- Counter-cast technology for box section decks
- The construction of girder bridges
- The effect of scale on the method of construction
- The design and construction of arches
- Cable-supported decks
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2 comments
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