Recent surveys of the us infrastructure s condition have rated a staggering number of bridges structurally deficient or functionally obsolete while not necessarily unsafe a structurally deficient bridge must be posted for weight and have limits for speed due to its deteriorated structural components bridges with old design features that canno. Safety and reliability of bridge structures crc press book concerns about bridge safety and reliability go beyond geographical boundaries and are shared by bridge engineers from different countries this book contains a number of selected papers that were presented at the fifth new york city bridge conference held on august 17 18 2009 . An extensive part is devoted to structural reliability including practical engineering approaches and reliability assessment of existing structures safety concepts for design consider the lifetime of structures and summarise safety formats from simple partial safety factors to develop approaches suitable for application in sophisticated . Abstract the bridge street bridge was constructed in 1880 by the king iron bridge company of cleveland ohio it survives as a unique example of a nineteenth century hand operated mechanical drawbridge the lifting system is based on a french design from the early 19th century. However a paradigm shift is necessary in the inspection and monitoring practices of the bridge engineering community to provide preventive maintenance and restore the publics confidence in the safety of bridges concerns about bridge safety and reliability go beyond geographical boundaries and are shared by bridge engineers from different
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