This guidebook provides guidance to state departments of transportation for using specific, practical, and risk-related management practices and analysis tools for managing and controlling transportation project costs. Containing a toolbox for agencies to use in selecting the appropriate strategies, methods and tools to apply in meeting their cost-estimation and cost-control objectives, this guidebook should be of immediate use to practitioners that are accountable for the accuracy and reliability of cost estimates during planning, priority programming and preconstruction.
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This report presents guidelines that will be of use to state departments of transportation, local governments, and consultants for the geometric design of driveways. It contains driveway-related terms and definitions, basic geometric controls, a summary of access spacing principles, and detailed discussions of various geometric design elements. The objective of the research was to develop recommendations for the geometric design of driveways that consider standard engineering practice and accessibility needs and provide for safe and efficient travel by motorists, pedestrians, and bicyclists on the affected roadway.
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This report presents a recommended guide specification for the design of externally bonded Fiber-Reinforced Polymer (FRP) systems for the repair and strengthening of concrete bridge elements. This guide specification addresses the design requirements for members subjected to different loading conditions (e.g., flexure, shear and torsion, and combined axial force and flexure). The guide specification is supplemented by design examples to illustrate its use for different FRP strengthening applications. The guide specification is presented in AASHTO LRFD format to facilitate use and incorporation into the "AASHTO LRFD Bridge Design Specifications." The material contained in the report should be of immediate interest to state engineers and others involved in the strengthening and repair of concrete structures using FRP composites.
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Design of Roadside Barrier Systems Placed on MSE Retaining Walls
Author: Bligh, Roger P | Size: 16.18 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2010 | pages: 194 | ISBN: 9780309154994
This report presents a design procedure for roadside barrier systems mounted on the edge of a mechanically stabilized earth (MSE) wall. The procedures were developed following AASHTO Load and Resistance Factor Design (LRFD) practices. The report will be of particular interest to personnel responsible for the structural design of MSE walls.
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Models for Predicting Reflection Cracking of Hot-Mix Asphalt Overlays
Author: Lytton, Robert L | Size: 3.41 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2010 | pages: 70 | ISBN: 9780309155052
This report presents mechanistic-based models for predicting the extent and severity of reflection cracking in hot-mix asphalt (HMA) overlays. These models were developed for use in the design and analysis of HMA overlays; they can be incorporated into the AASHTO Mechanistic-Empirical Pavement Design Guide (MEPDG) software. The report and accompanying software will guide pavement and construction engineers in identifying and specifying HMA overlays for asphalt and concrete pavements that will provide desired service life and performance. The information contained in the report will be of immediate interest to state pavement engineers and others concerned with the design and rehabilitation of asphalt and concrete pavements.
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This report updates the Federal Highway Administration's "Roundabouts: An Informational Guide" based on experience gained in the United States since that guide was published in 2000. The report addresses the planning, design, construction, maintenance, and operation of roundabouts. It also includes information that will be useful in explaining to the public the trade-offs associated with roundabouts.
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This report presents a level-of-service-based approach to describing performance of Interstate Highway System (IHS) assets. It also provides a template and process that state departments of transportation (DOTs) can use to implement this approach for managing their IHS assets. Well-described levels of service are an effective means for communicating with public officials, highway users, and other stakeholders about asset performance and resources needed to ensure adequate performance. The IHS, the result of a major national investment, is vital to the nation's economy and an increasingly critical contributor to global production and distribution systems, but the system's assets are owned and managed by the states. While the specific measures that define excellent or poor levels of service may vary from one state to another, a consistent framework and measures for IHS levels of service would support benchmarks that DOTs and other responsible agencies can use to assess their Interstate maintenance and preservation needs and management their IHS assets.
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This report presents a potential framework for a National Bridge Maintenance Database (NBMD). This framework provides a uniform format for collecting, reporting, and storing information on bridge maintenance actions. Use of this framework will promote compatibility of maintenance data reported by different agencies and will provide an effective means for using these data in evaluating cost and performance of alternative maintenance applications or as a basis for cost-benefit analysis and evaluation of cost and deterioration models. The material contained in the report should be of immediate interest to state bridge and maintenance engineers and others concerned with the maintenance and management of bridges.
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Development of a Precast Bent Cap System for Seismic Regions
Author: Restrepo, Jose I | Size: 7.76 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 114 | ISBN: 9780309155335
This report develops and validates precast concrete bent cap systems for use throughout the nation's seismic regions. The report also includes a series of recommended updates to the AASHTO "LRFD Bridge Design Specifications," "Guide Specification for LRFD Seismic Bridge Design," and AASHTO "LRFD Bridge Construction Specifications" that will provide safe and reliable seismic resistance in a cost-effective, durable, and constructible manner. The material in this report will be of immediate interest to bridge engineers.
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