This report presents the findings of a research project to develop recommended design guidelines for safe and aesthetic roadside treatments in urban areas and a toolbox of effective roadside treatments that balance pedestrian, bicyclist, and motorist safety and mobility. The report will be of particular interest to designers and safety practitioners responsible for the design of arterial and collector-type facilities in urban areas.
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This report presents the findings of a research project to determine the crash rates for nighttime and daytime work zones, develop management practices that promote safety and mobility in work zones, and develop work-zone crash reporting recommendations to further improve the data collected on work zone crashes. The report will be of particular interest to practitioners responsible for work zone safety.
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Acceptance Tests for Surface Characteristics of Steel Strands in Prestressed Concrete
Author: Osborn, Andrew E N | Size: 7.32 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 138 | ISBN: 9780309117616
This report provides practical tests to identify and measure residues (e.g., rust, lubricants used in manufacturing processes, or corrosion inhibitors) on the surface of steel prestressing strands and to establish thresholds for residue types found to affect the strength of the strand's bond to concrete. Key products presented here are four test methods suitable for use in a quality assurance program for the manufacture of steel prestressing strand. The report will be of particular interest to bridge engineers in state highway agencies and industry and to suppliers of steel prestressing strand.
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Seismic Analysis and Design of Retaining Walls, Buried Structures, Slopes, and Embankments
Author: Anderson, Donald G | Size: 9.77 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 147 | ISBN: 9780309117654
This report provides analytical and design methods for the seismic design of retaining walls, buried structures, slopes, and embankments. The report details the development of the design procedures. Recommended load and resistance factor design (LRFD) specifications and design examples illustrating the application of the design methods and specifications are included in an Appendix. The material in this report will be of immediate interest to roadway and bridge designers.
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This report provides specifications, commentary, and examples for the design of horizontally curved concrete box-girder highway bridges. The report details the development of the design procedures. Recommended Load and Resistance Factor Design (LRFD) specifications and design examples illustrating the application of the design methods and specifications are included in appendixes (available on the TRB website at http://trb.org/news/blurb_detail.asp?id=9596). The material in this report will be of immediate interest to bridge designers.
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Author: Sicking, Dean L | Size: 1.95 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2009 | pages: 38 | ISBN: 9780309117814
This report provides guidance on selecting the appropriate barrier performance level for the installation of longitudinal barriers. The report presents performance-level selection guidelines to help designers determine the most appropriate guardrail test level for any route. Further, site-specific guidelines not only identify what guardrail test level should be incorporated but also can be used to determine when guardrail use is not cost beneficial. Supplemental procedures for identifying appropriate guardrail test levels have also been developed. These procedures expand the applicability of the guardrail selection guidelines to many unusual hazards that cannot be included in development of general procedures. The report will be of particular interest to designers with responsibility for designing roadside safety features.
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This report contains the findings of research performed to quantify the safety and operational impacts of design element trade-offs and their associated risks. The report details the research performed and includes specific recommended crash prediction models and Accident Modification Factors (AMFs) for shoulder width and median width on rural four-lane roads. Thus, the report will be of immediate interest to engineers in state highway agencies responsible for geometric design and traffic operations and safety.
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This report presents proposed guidelines for dowel alignment in concrete pavements. These guidelines deal with the effects of dowel misalignment on performance and the measures for reducing misalignment and its adverse effect. The report will guide pavement and construction engineers in considering dowel misalignment in pavement design and identifying measures for reducing misalignment during construction or for dealing with misaligned dowels. The information contained in the report will be of immediate interest to state engineers and others concerned with concrete pavement design and construction.
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Adhesive Anchors in Concrete Under Sustained Loading Conditions
Author: Cook, Ronald A | Size: 9.67 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2009 | pages: 142 | ISBN: 9780309117883
This report presents a test method recommended to determine an adhesive anchor's ability to resist sustained tensile loads. The report will be of immediate interest to public- and private-sector engineers with responsibility for the specification and use of adhesive anchor systems. The recommended test method, which is presented in Appendix A in the form of a draft AASHTO standard, is under consideration for possible adoption by the AASHTO Highway Subcommittee on Materials.
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