Author: Saeed, A Hall Jr, J W | Size: 377 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 56 | ISBN: 030908783X
This report provides definitions and guidelines to help agencies involved in accelerated pavement testing (APT) ensure proper interpretation of the data and facilitate their use by other agencies. Use of these guidelines will promote compatibility of data resulting from APT at different facilities and will provide an effective means for economically addressing issues of common concern, reducing duplication of research efforts, and enhancing the benefits of APT. The report is a useful resource for pavement and materials engineers, researchers, and others involved in the accelerated evaluation of pavement materials, designs, and features.
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Posted by: mahyarov - 10-24-2012, 09:15 AM - Forum: Concrete
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Extending Span Ranges of Precast Prestressed Concrete Girders
Author: Castrodale, R W White, C D | Size: 24.14 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: - | ISBN: 0309087872
This report contains the findings of research performed to develop recommended load and resistance factor design (LRFD) procedures for achieving longer spans using precast prestressed concrete bridge girders. Standard details and examples illustrating the design of three typical bridges were also developed. The material in this report will be of immediate interest to bridge designers. Each year, 200 to 300 bridges are built with spans exceeding 160 feet. Generally, these spans are not designed with precast prestressed concrete girders because of limited experience and limited information. In addition, the size and weight of many precast sections precludes land transportation. Limited choices lead to decreased competition between bridge types and materials, which results in higher costs to owners. Solutions to increase the span range of precast prestressed concrete girders used in the United States and abroad include splicing segments for longer simple or continuous spans, connecting simple spans for continuity, and assembling haunched pier segments in the field. However, this experience and the technology for applying these solutions are fragmented and job-specific. The objective of this research was to develop recommended LRFD procedures, standard details, and design examples for achieving longer spans using precast prestressed concrete bridge girders. The report fully documents the research leading to the conclusion that spliced-girders are the design option with the greatest potential for extending span length. Detailed design examples for one-, two-, and three-span spliced girder bridges are included as appendixes.
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Safety Evaluation of Permanent Raised Pavement Markers
Author: Bahar, G Mollett, C Persaud, B Lyon, C Smiley, A Smahel, T McGee, H | Size: 816 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 68 | ISBN: 0309087902
This report presents the findings of a research project to evaluate the safety performance of snowplowable permanent raised pavement markers (PRPMs) on two-lane roadways and four-lane freeways. An analytical engineering procedure relying on safety performance functions or crash prediction models for roadways with and without PRPMs was developed to determine the potential cost-effectiveness of implementing PRPMs at a location. The report will be of particular interest to traffic engineers with responsibility for installing and maintaining pavement marking systems.
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Posted by: mahyarov - 10-24-2012, 09:08 AM - Forum: Concrete
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Connection of Simple-Span Precast Concrete Girders for Continuity
Author: Miller, R A Castrodale, R Mirmiran, A Hastak, M | Size: 4.72 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 203 | ISBN: 0309087937
This report contains the findings of research to develop recommended details and specifications for the design of continuity connections for precast concrete girders. Examples illustrating the design of four precast girder types made continuous for live load were also developed. The material in this report will be of immediate interest to bridge designers.
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Load and Resistance Factor Design (LRFD) for Deep Foundations
Author: Paikowsky, S G Birgisson, B McVay, M Nguyen, T Kuo, C Baecher, G Ayyub, B Stenersen, K O'Malley, K Chernauskas, L O'Neill, M | Size: 1.86 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 85 | ISBN: 0309087961
This report contains the findings of a study to develop resistance factors for driven pile and drilled shaft foundations. These factors are recommended for inclusion in Section 10 of the AASHTO Load and Resistance Factor Design (LRFD) Bridge Design Specifications to reflect current best practice in geotechnical design and construction. The report also provides a detailed procedure for calibrating deep foundation resistance. The material in this report will be of immediate interest to bridge engineers and geotechnical engineers involved in the design of pile and drilled shaft foundations.
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Guideline and Recommended Standard for Geofoam Applications in Highway Embankments
Author: Stark, T D Arellano, D Horvath, J S Leshchinsky, D | Size: 1.61 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 73 | ISBN: 0309088046
This report provides a design guideline and recommended standard for geofoam applications in the design and construction of highway embankments. The guidelines and standard will assist highway agencies in designing and constructing highway embankments using expandable polystyrene (EPS) blocks. The report will be of immediate interest to engineers in the public and private sectors involved in the design, construction, and material specification of lightweight embankments constructed on soft foundation soils.
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Author: Wassef, W G Davis, D | Size: 1.37 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 97 | ISBN: 0309088127
This report contains the findings of research to develop recommended details, design methodologies, and specifications for integral connections of steel superstructures to concrete intermediate piers. An example illustrating the design of the connection of the cap beam to the girders and column is also included. The material in this report will be of immediate interest to bridge designers.
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This report discusses the findings of a research project undertaken to investigate bridge scour in cohesive soils. The report presents a recommended method for predicting the extent of complex pier and contraction scour in cohesive soils. This report will be of immediate interest to engineers with responsibility for predicting the extent of scour at bridge foundations and to engineers with responsibility for designing bridge foundations and bridge scour countermeasures.
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Identification of Research Needs Related to Highway Runoff Management
Author: Venner, M Leisenring, M Pankani, D Strecker, E | Size: 1.30 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: 173 | ISBN: 0309088151
This report presents an analysis of research needs in the area of highway water runoff management and control. Research directors and water-quality professionals from state departments of transportation participated in a survey to identify pressing needs related to the impacts and control of stormwater runoff. The survey results were supplemented with an extensive literature review and analysis by the research team. This report will be of great value in formulating high-priority research efforts at the national, state, and local levels.
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Guidelines for Inspection and Strength Evaluation of Suspension Bridge Parallel Wire Cables
Author: Mayrbaurl, R M | Size: 8.98 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2004 | pages: - | ISBN: 0309088097
There are nearly 50 major suspension bridges in the United States, and more than half of them are more than 50 years old. To date there has been no reliable and nationally recognized procedure, either practical or theoretical, to inspect and evaluate the condition and strength of suspension bridge parallel-wire cables. This report contains recommendations for the inspection and strength evaluation of suspension bridge parallel-wire cables. It will be of immediate interest to suspension bridge owners and suspension bridge main cable inspectors. An accompanying CD-ROM contains a full account of the research leading to the development of the recommended guidelines and provides derivations of all equations.
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