Author: Mertz, Dennis R Beckmann, Fred R | Size: 837 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2005 | pages: 86 | ISBN: 0309097487
This synthesis will be of interest to all individuals involved in steel bridge fabrication, assembly, and erection. It examines, discusses, and analyzes steel bridge erection practices for I-girder, tub-girder, and box-girder bridges; particularly curved, skewed, and staged structures. Key topics considered include the impact of design and analysis practices on erection; methods used to predict erection deflections as a function of bridge type and complexity; shop-assembly practices and alternate methods of ensuring properly assembled geometry; stability issues; field connection practices; examples of structures in which erection practices have caused problems; owner requirements for erection procedures, implementation of requirements, and the impact of procedures on the quality of erection; and current and proposed research. This synthesis reports on the responses to three questionnaires sent to all U.S. state departments of transportation (DOTs) and Canadian provinces, 24 steel bridge fabricators, and 25 steel bridge erectors and contractors. Responses were received from 30 state DOTs, 2 provinces, 15 fabricators, and 4 erectors. Follow-up information was gathered by telephone interviews.
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This synthesis identifies and explains various inspection and maintenance techniques for bridge stay cable systems. It discusses both short- and long-term approaches. Topics covered included methods for inspections and assessments, including nondestructive testing and evaluation procedures; repair and retrofit; methods for control of cable vibrations, including rain-wind vibrations; stay cable fatigue and failure; effectiveness of various inspection and repair methods; limitations of available technologies; and trends and recommendations for future study. This synthesis effort was based on a comprehensive review of domestic and international literature on the inspection, repair, testing, and design of stay cable. On-line sources of information as well as engineering databases were examined. A questionnaire was distributed to all state and provincial departments of transportation in the United States and Canada to determine current state of the practice. Also, contacts were made with a number of knowledgeable individuals for information. Additional information was gathered from the examination of test reports and condition assessments from inspection of cable-stayed bridges, a review of a limited number of maintenance and inspection manuals for cable-stayed bridges, and a patent search using the U.S. Patent and Trademark Office database.
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This synthesis may be useful to bridge owners and consulting engineers engaged in the design, inspection, and management of bridges with fracture-critical details, as a guide to present specifications and engineering judgment. It focuses on the inspection and maintenance of bridges with fracture-critical members (FCMs), as defined in the AASHTO "LRFD Bridge Design Specifications." The objectives of this report were to survey and identify gaps in the literature; determine practices and problems with how bridge owners define, identify, document, inspect, and manage bridges with fracture-critical details; and identify specific research needs. Among the areas examined were: inspection frequencies and procedures; methods for calculating remaining fatigue life; qualification, availability, and training of inspectors; cost of inspection programs; instances where inspection programs prevented failures; retrofit techniques; fabrication methods and inspections; and experience with FCM fractures and problems details. This synthesis contains information obtained from a survey distributed to bridge owners and consultant inspectors (72 state, provincial, and international departments of transportation and agencies), a literature search, and targeted interviews. Useful responses were received from 34 states and three Canadian provinces.
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Author: Sirles, Phil C | Size: 4.00 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 116 | ISBN: 0309097649
This synthesis presents the state of the practice regarding the use of geophysics for transportation projects. The report focuses on U.S. state and Canadian provincial departments of transportation (DOTs), and U.S. federal transportation agencies. The main points addressed include who is using geophysics and why, which methods and applications are the most commonly used, the use of in-house expertise compared with contracting private consultants, and how geophysical service contracts are procured and implemented. The scope was limited to how geophysics is being applied by geotechnical engineers during highway planning and construction activities. The information included in this synthesis was obtained from a review of the published literature; a survey of all 50 state DOTs, the District of Columbia, Canadian provinces, and selected federal government agencies; and follow-up telephone interviews designed to clarify or expand on particular aspects of some survey responses.
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For the past 25 years, much knowledge and experience has been acquired by the engineering and construction industries on the use of rock-socketed shafts for support of transportation structures. This synthesis collected, reviewed, and organized the most salient aspects of this knowledge and experience to present it in a form useful to foundation designers, researchers, contractors, and transportation officials. The objectives of this report were to collect and summarize information on current practices pertaining to each step of the design process, along with the limitations; identify emerging and promising technologies; determine the principal challenges in advancing the state of the practice; and provide suggestions for future developments and improvements in the use and design of rock-socketed shafts. For this TRB synthesis report a literature review was conducted on all topics related to drilled shaft in rock or intermediate geomaterials. A questionnaire was developed and distributed to the principal geotechnical and structural engineers of U.S. state and Canadian provincial transportation agencies. Questions were grouped into the following categories: use of rock-socketed shafts by the agency, evaluation of rock and intermediate geomaterials, design methods for axial loading, design methods for lateral loading, structural design, construction, and field load and integrity testing.
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Author: Andreas Öchsner, Lucas Filipe Martins da Silva, Holm Altenbach (Eds.) | Size: 17 MB | Format:PDF | Quality:Unspecified | Publisher: Springer | Year: 2010 | pages: 372 | ISBN: 3642126669, ISBN-13: 978-3642126666
The increasing demand for materials with superb properties in all types of technical applications requires the development of advanced materials and respective tools to characterise and predict the material properties and behaviour. This monograph highlights the latest developments and trends in advanced materials and their properties, the modelling and simulation of non-classical materials and structures, and new technologies for joining materials.
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Author: Öchsner, Andreas; Silva, Lucas F. M. da; Altenbach, Holm (Eds.) | Size: ? MB | Format:PDF | Quality:Original preprint | Publisher: Springer | Year: 2012 | pages: 727 | ISBN: 978-3-642-22699-1
This volume highlights the latest developments and trends in advanced materials and their properties, the modeling and simulation of non-classical materials and structures, and new technologies for joining materials. It presents the developments of advanced materials and respective tools to characterize and predict the material properties and behavior.
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Sand–rubber mixtures: Experiments and numerical simulations
Author: Julio R. Valdes, T. Matthew Evans | Size: 0.34 MB | Format:PDF | Quality:Original preprint | Publisher: Canadian Geotechnical Journal; Vol. 45 Issue 4 | Year: April 2008 | pages: 588-595, 7p
Sand–rubber mixtures (large rubber chips)
Author: H.-K. Kim, J. C. Santamarina | Size: 0.78 MB | Format:PDF | Quality:Original preprint | Publisher: Canadian Geotechnical Journal; Vol. 45 Issue 10 | Year: Oct. 2008 | pages: 1457-1466, 9p
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