This report contains the findings of research performed to develop recommended Load and Resistance Factor Design (LRFD) live load distribution factor design equations for shear and moment. The report details the development of equations that are simpler to apply and have a wider range of applicability than current methods. The material in this report will be of immediate interest to bridge engineers.
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Countermeasures to Protect Bridge Piers from Scour
Author: Lagasse, P F | Size: 14.58 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2007 | pages: 287 | ISBN: 9780309099097
This report documents research on local scour at bridge piers resulting in the development and recommendation of a practical selection criteria for bridge-pier scour countermeasures, guidelines and specifications for design and construction of those countermeasures, and guidelines for their inspection, maintenance, and performance evaluation. Because of their critical role in ensuring bridge integrity and potentially high cost of these countermeasures, it is important that the most appropriate countermeasures be selected, designed, and constructed. The contents of this report are, therefore, of immediate interest to highway professionals responsible for planning, administrating, evaluating, designing, constructing, inspecting and maintaining bridges and other structures founded in erosive areas. The report is also of interest to those charged with specifying materials testing procedures and acceptable results, setting budget goals, and making policy.
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This report provides recommended guidelines and AASHTO load and resistance factor design (LRFD) specifications language for design, fabrication, and construction of full-depth precast concrete bridge deck panel systems. Durable and rapidly constructed connections between panels were also developed as part of this research. The report details the development of the guidelines, connection details, and recommended specifications. The material in this report will be of immediate interest to bridge designers.
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This report contains recommendations for performance-related procedures to test and select recycled hot-mix asphalt (HMA) and portland cement concrete (PCC) materials for use in unbound layers of highway pavements. The report provides a comprehensive description of research intended to help materials engineers evaluate and select the reclaimed asphalt (RAP) and reclaimed concrete pavement (RCP) materials that should contribute to good performing pavements. Also, the report describes procedures for the recommended tests. The contents of this report will be of immediate interest to materials engineers, researchers, and others concerned with the construction and performance of asphalt and PCC pavements.
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This report presents recommended construction specifications to facilitate highway agencies' use of bonded fiber-reinforced polymer (FRP) composites for the repair and retrofit of concrete structures. These specifications cover the construction of FRP systems used as externally bonded or near surface-mounted reinforcement to enhance axial, shear, or flexural strength of a concrete member. These specifications are supplemented by a construction process control manual that provides a program for assuring a consistent and uniform control of quality and regulatory requirements. The material contained in this report will be of immediate interest to engineers, inspectors, contractors, suppliers, and others involved in the repair and retrofit of concrete structures using FRP composites.
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This report summarizes the results of a project to evaluate the use of controlled low-strength material (CLSM) in highway construction applications, in particular, as backfill, utility bedding, and void fill and in bridge approaches. A key product presented in this report is a recommended practice for the use of CLSM that was validated through a series of full-scale field experiments. The report will be of particular interest to materials and construction engineers in state highway agencies and industry.
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Default Values for Highway Capacity and Level of Service Analyses
Author: Zegeer, John D | Size: 6.03 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 132 | ISBN: 9780309099318
Based on the assembly of an extensive set of field data from across the United States, this report presents valuable information on the appropriate selection of default values when analyzing highway capacity and level of service. The report will be useful to planners, geometric designers, and traffic engineers who do not have ready access to field data for an analysis. The report also describes how to prepare service volume tables, which can be a useful sketch planning technique.
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Specifications and Protocols for Acceptance Tests on Processing Additions in Cement Manufacturing
Author: Taylor, Peter C | Size: 3.09 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 94 | ISBN: 9780309099349
This report presents recommended changes to the cement specifications and test protocols contained in AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing (AASHTO M 85). These changes pertain to the amount of processing additions that can be incorporated in the cement and the tests required for evaluating acceptability of cements incorporating processing additions. The report also presents a recommended specification for evaluating processing additions that may be used in amounts exceeding those stipulated in the cement specification. These specifications will guide materials engineers and cement producers in evaluating cements and assuring that highway concrete is not deleteriously affected by the presence of such additions. The information contained in the report will be of immediate interest to state materials engineers and others involved in specifying and evaluating concrete mixtures for use in highway pavements and structures.
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This report summarizes the results of a project to establish limits, based on fatigue and fracture performance, on the number of damage and repair cycles to which damaged steel bridge girders may be subjected using the heat-straightening procedure. A key product presented here is suggested revisions to the Federal Highway Administration (FHWA) manual of practice for heat straightening. The report will be of particular interest to engineers in state highway agencies and industry responsible for bridge maintenance and repair.
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This report summarizes the results of a project to establish limits, based on fatigue and fracture performance, on the number of damage and repair cycles to which damaged steel bridge girders may be subjected using the heat-straightening procedure. A key product presented here is suggested revisions to the Federal Highway Administration (FHWA) manual of practice for heat straightening. The report will be of particular interest to engineers in state highway agencies and industry responsible for bridge maintenance and repair.
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