Innovative Bridge Designs for Rapid Renewal Toolkit (2012) / Chapter Skim
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1Accelerated bridge construction (ABC) techniques have the potential to minimize traffi c disruptions during bridge renewals, promote traffi c and worker safety, and also improve the overall quality and durability of bridges.
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2INNOVATIVE BRIDGE DESIGNS FOR RAPID RENEWAL: ABC TOOLKIT standards for modular bridge substructure and superstructure systems that can be installed with minimal traffic disruptions in renewal applications. This project takes the approach that, for ABC to be successful, ABC designs should allow maximum opportunities for the general contractor to do its own prefabrication and erection.
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3INNOVATIVE BRIDGE DESIGNS FOR RAPID RENEWAL: ABC TOOLKIT Project R04 was composed of three distinct phases over a time period of 4 years, beginning in 2008. Phase I was completed in November 2009.
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4INNOVATIVE BRIDGE DESIGNS FOR RAPID RENEWAL: ABC TOOLKIT • Precast complete pier systems: -- Conventional pier bents, and -- Straddle pier bents; • Modular superstructure systems: -- Decked steel stringer systems, -- Concrete deck bulb tees, and -- Concrete deck double tees; • ABC bridge erection systems: -- Erection using cranes, -- Above-deck driven carriers, and -- Launched temporary truss bridges. The development of detailed sample design calculations for use by future designers provides a step-by-step guidance on the overall structural design of the prefabricated bridge elements and systems.
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5INNOVATIVE BRIDGE DESIGNS FOR RAPID RENEWAL: ABC TOOLKIT OBJECTIVES FOR THE ABC TOOLKIT An objective of this project was to identify impediments and obstacles to greater use of ABC and seek solutions to overcome them. Focus group meetings and owner surveys identified several factors that have contributed to the slow adoption of ABC in the United States.
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6INNOVATIVE BRIDGE DESIGNS FOR RAPID RENEWAL: ABC TOOLKIT Repeated use of the same system will allow the continuous refinement of the ABC concept, thereby reducing risks and lowering costs. The standard concepts provide substantially complete details pertaining to the ABC aspects of the project.
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