Author: Concrete Bridge Development Group (CBDG)
29 May 2014
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Concrete Bridge Development Group (CBDG)
The final article in this series examines the long-term management of concrete bridges. The inspection and assessment of a bridge over its entire life, the maintenance requirements and possible strengthening to upgrade the bridge to a new load configuration or revised layout are discussed.
This article examines the prestressing for a concrete bridge. Prestressing enhances the capacity of a member that is weak in tension, but strong in compression. It effectively creates a new material that is strong in tension. A prestressed bridge has much less steel to be handled, which reduces congestion, leading to easier and quicker concrete placing.
This month’s article from the CBDG’s Technical Committee examines the construction methods for the six basic types of precast concrete bridge: • Standard precast inverted T/Y, I or U beams • Bespoke precast T, I or U beams • Precast segmental box girders with short segments • Whole span precast box girders • Incrementally launched box girders • Modular precast system with short shell segments