Fatigue-Resistant Design of Cantilevered Signal, Sign, and Light Supports
Author: Dexter, R J Ricker, M J | Size: 2.73 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2002 | pages: 278 | ISBN: 0309067243
This report contains the findings of a study on fatigue resistance of cantilevered signal, sign, and light supports. The report includes design examples illustrating the application of the fatigue provisions of the American Association of State Highway and Transportation Officials (AASHTO) "Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals"; guidance on design, installation, inspection, and maintenance of these structures; and recommended specifications for anchor rods. The material in this report will be of immediate interest to bridge and structural engineers, traffic engineers, and manufacturers.
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This report documents and presents results of a study on evaluating remaining service life of metal-tensioned systems, including rock bolts, tiebacks, and soil nails. A recommended practice is proposed describing procedures to evaluate the condition and remaining useful life of in-place, metal-tensioned systems and to estimate the design life of new installations. The recommended practice considers key factors such as materials used in the tensioned systems; corrosion; anchorage methods; soil and rock conditions; environmental effects; construction techniques; and long-term, cost-effective measuring techniques. Nondestructive testing (NDT) techniques--including measurement of half-cell potential and polarization current, impact echo testing, and ultrasonic probing--are used for condition assessment of metal-tensioned systems. NDT techniques are included in the recommended practice to supplement destructive tests, which provide the most reliable information needed for recommending future actions. Application of the recommended practice is demonstrated through field investigation of an inventory of existing metal-tensioned systems representing a range of types, subsurface conditions, and ages. Data from the field studies serve to validate the measurement methods, the corrosion assessment model, and the model for estimating the remaining useful service life described in the recommended practice.
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Recommended Practice for Evaluation of Metal-Tensioned Systems in Geotechnical Applications
Author: Withiam, J L Fishman, K L Gaus, M P | Size: 3.07 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 143 | ISBN: 0309067626
This report documents and presents results of a study on evaluating remaining service life of metal-tensioned systems, including rock bolts, tiebacks, and soil nails. A recommended practice is proposed describing procedures to evaluate the condition and remaining useful life of in-place, metal-tensioned systems and to estimate the design life of new installations. The recommended practice considers key factors such as materials used in the tensioned systems; corrosion; anchorage methods; soil and rock conditions; environmental effects; construction techniques; and long-term, cost-effective measuring techniques. Nondestructive testing (NDT) techniques--including measurement of half-cell potential and polarization current, impact echo testing, and ultrasonic probing--are used for condition assessment of metal-tensioned systems. NDT techniques are included in the recommended practice to supplement destructive tests, which provide the most reliable information needed for recommending future actions. Application of the recommended practice is demonstrated through field investigation of an inventory of existing metal-tensioned systems representing a range of types, subsurface conditions, and ages. Data from the field studies serve to validate the measurement methods, the corrosion assessment model, and the model for estimating the remaining useful service life described in the recommended practice.
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Author: Ghosn, M Moses, F | Size: 1.66 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 182 | ISBN: 0309087503
This report contains the findings of a study to develop a design procedure for application of extreme event (e.g., vessel collisions, scour caused by flooding, winds, earthquakes) loads and extreme event loading combinations to highway bridges. The report describes the research effort leading to the recommended procedure and discusses the application of reliability analysis to bridge design. The material in this report will be of immediate interest to bridge engineers and bridge-design specification writers.
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The two primary obstacles for applying bridge life-cycle cost analysis (BLCCA) have been the lack of a uniformly accepted methodology and the lack of access to reliable cost and service life personnel. There is also an apparent conflict with the least-first-cost method of contract administration. The lack of a rational approach to the consideration of important factors such as obsolescence, bridge vulnerability to extreme events, and the uncertainty in the cost and timing of repairs has also hindered the use of life-cycle costing in the past. This report and the BLCCA methodology developed as part of NCHRP Project 12-43 provide a framework for carrying out BLCCA and explicitly consider obsolescence, bridge vulnerability, and uncertainty. Cost parameters are included with recommended default values. The methodology provides the flexibility to add additional cost parameters identified in future research. This methodology is augmented by a BLCCA software package (with User's Manual), which automates the analysis process, and by a Guidance Manual, which describes the BLCCA process.
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Structural Supports for Highway Signs, Luminaires, and Traffic Signals
Author: Fouad, F H Davidson, J S Delatte, N Calvert, E A CHEN, S-E Nunez, E Abdalla, R | Size: 459 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 58 | ISBN: 0309087538
This report contains the findings of a study to develop recommended revisions to the AASHTO "Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals." The report describes the research effort and provides recommendations for updating and refining the specifications. A strategic plan for further enhancement of the specifications and for conversion of the specifications to load and resistance factor format is also included. The material in this report will be of immediate interest to specification writers, structural engineers, and designers.
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Posted by: mahyarov - 10-24-2012, 10:03 AM - Forum: Concrete
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Application of Fiber-Reinforced Polymer Composites to the Highway Infrastructure
Author: Mertz, D R Chajes, M J Gillespie Jr, J W Kukich, D S Sabol, S A Hawkins, N M Aquino, W Deen, T B | Size: 513 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 87 | ISBN: 0309087694
This report contains the findings of a study to develop a strategic plan for guiding the application of fiber reinforced polymer composites in the highway infrastructure. The report describes the research effort and presents the strategic plan. The material in this report will be of immediate interest to bridge engineers interested in increasing the use of fiber reinforced polymer composites.
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Posted by: mahyarov - 10-24-2012, 10:01 AM - Forum: Concrete
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Prestress Losses in Pretensioned High-Strength Concrete Bridge Girders
Author: Tadros, M K Al-Omaishi, N Seguirant, S J Gallt, J G | Size: 1.39 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 71 | ISBN: 030908766X
This report presents guidelines to help bridge designers obtain realistic estimates of prestress losses in high-strength pretensioned concrete bridge girders and thus achieve economical designs. These guidelines incorporate procedures that yield more accurate predictions of modulus of elasticity, shrinkage, and creep of concrete and more realistic estimates of prestress losses than those provided by the procedures contained in current specifications. This report will be of particular interest to engineers, researchers, and others concerned with the design of pretensioned concrete bridge structures.
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Geometric Design Consistency on High-Speed Rural Two-Lane Roadways
Author: Wooldridge, M D Fitzpatrick, K Harwood, D W Potts, I B Elefteriadou, Lily | Size: 809 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 93 | ISBN: 0309087686
This report discusses geometric design consistency, particularly for rural roads. It presents rules on geometric design consistency suitable for use in an expert system such as the Interactive Highway Safety Design Model (IHSDM). The rules can also be used directly by a designer to evaluate roadway designs or to conduct reviews of existing roadways, improving design consistency and safety.
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