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Of the approximately 25,000 bridges in Iowa, 28% are classified as structurally deficient, functionally obsolete, or both. The state of Iowa thus follows the national trend of an aging infrastructure in dire need of repair or replacement with a relatively limited funding base. Therefore, there is a need to develop new materials with properties that may lead to longer life spans and reduced life-cycle costs. In addition, new methods for determining the condition of structures are needed to monitor the structures effectively and identify when the useful life of the structure has expired or other maintenance is needed. High-performance steel (HPS) has emerged as a material with enhanced weldability, weathering capabilities, and fracture toughness compared to conventional structural steels. In 2004, the Iowa Department of Transportation opened Iowa's first HPS girder bridge, the East 12th Street Bridge over I-235 in Des Moines, IA. The objective of this project was to evaluate HPS as a viable option for use in Iowa bridges with a continuous structural health monitoring (SHM) system. The scope of the project included documenting the construction of the East 12th Street Bridge and concurrently developing a remote, continuous SHM system using fiber-optic sensing technology to evaluate the structural performance of the bridge. The SHM system included bridge evaluation parameters, similar to design parameters used by bridge engineers, for evaluating the structure. Through the successful completion of this project, a baseline of bridge performance was established that can be used for continued long-term monitoring of the structure. In general, the structural performance of the HPS bridge exceeded the design parameters and is performing well. Although some problems were encountered with the SHM system, the system functions well and recommendations for improving the system have been made.
This book presents 108 canyon bridges that best represent the highest level of bridge construction in China and is divided into four chapters including suspension bridge, cable-stayed bridge, arch bridge and beam bridge. It introduces the definition of canyon bridge for the first time and gives an overview of each bridge's structural characteristics, design and construction techniques, as well as management and maintenance measures. Furthermore, this book provides elevation layout drawings and real view pictures. Chinese version of this book was awarded “Fan Lichu Book Prize” by Bridge and Structure Committee of China Civil Engineering Society in August 2020. It is the first book accounting of canyon bridges and appeals to a wide readership, from bridge designers and engineers to the general public who has interests to learn bridge construction in mountainous areas.
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
These proceedings are from The Fourth International Conference on Bridge Management that consolidated the best and, more importantly, up-to-date research conducted in the field of bridge management. Since the first conference in 1990 the scientific art of bridge management has advanced at an astonishing rate. There has been a change from a curative to a preventative approach to bridge management, promising an increased longevity for the next generation of bridges and reduced whole-life costs, and practical and economical solutions have been found for some recurring problems.
An examination of creative systems in structural and construction engineering taken from conference proceedings. Topics covered range from construction methods, safety and quality to seismic response of structural elements and soils and pavement analysis.
"This book emphasizes the physical and practical aspects of fatigue and fracture. It covers mechanical properties of materials, differences between ductile and brittle fractures, fracture mechanics, the basics of fatigue, structural joints, high temperature failures, wear, environmentally-induced failures, and steps in the failure analysis process."--publishers website.
This book contains a selected number of papers that were presented at the Second New York City Bridge Conference organized by the Bridge Engineering Association. It represents the state-of-the-art papers from different countries on a wide spectrum of topics in bridge engineering.