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原文传递 Prefabricated/Precast Bridge Elements and Systems (PBES) for Off-System Bridges, Summary.

题名：	Prefabricated/Precast Bridge Elements and Systems (PBES) for Off-System Bridges, Summary.
作者：	M. D. Roddenberry;
关键词：	bridge foundations, design, implementation, prefrabrication, project planning, replacement, research project, standards, state highway departments
摘要：	The Federal Highway Administration's (FHWA ) 'Every Day Counts' initiative aims to shorten the overall project delivery time, enhance safety, and protect the environment both on and around construction projects. Using innovative planning, design, and construction methods, Accelerated Bridge Construction (ABC) techniques reduce on-site construction time for new or replacement bridges. One aspect of ABC is Prefabricated Bridge Elements and Systems (PBES), where bridge components are fabricated off site to reduce on-site construction activities. Many state departments of transportation (DOTs) are currently making efforts to implement PBES for construction of their off-system bridges. The purpose of this research project was to investigate other states' standards and to evaluate them for possible implementation in Florida. An exhaustive search was made, and new literature was reviewed, to learn about current DOT standards and practices. The search revealed that the states with the most prefabricated bridge standards or activities are as follows: Utah, Alabama, Texas, Minnesota, and a collaboration of Northeastern states. These standards were reviewed for details such as the presence of post-tensioning, joint types, design load, and inspectability. The two standard bridge types that show the most promise for adaption by Florida Department of Transportation (FDOT) are Minnesota's Inverted-tee Beam, and PCI's 'Northeastern Extreme Tee' (NEXT) Beam. A summary of the findings, including advantages and disadvantages of the bridge systems, is included in this report. Also included is a comprehensive list of Web links to standard drawings from all state DOTs, as well as more information on ABC and PBES, which could also be helpful to expedite other research that involves standards and bridge construction/design practices.
总页数：	1p
报告类型：	科技报告