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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Author: Sheppard, D Max | Size: 4.30 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 63 | ISBN: 9780309155373
This report presents recommendations for (1) a predictive equation for equilibrium local scour and (2) a potential equation for predicting scour evolution rates at wide piers and skewed piers. These equations provide better estimates of local scour and scour evolution rates than those predicted by currently available equations. Such estimates will reduce over-predictions and the unwarranted need for countermeasures. The material contained in the report should be of immediate interest to state hydraulic engineers and others involved in the design, operation, and maintenance of highway bridges.
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This report presents design guidelines for concrete girders strengthened in shear using externally bonded Fiber-Reinforced Polymer (FRP) systems. These guidelines address the strengthening schemes and application of the FRP systems and their contribution to shear capacity of reinforced and prestressed concrete girders. The guidelines are supplemented by design examples to illustrate their use for concrete beams strengthened with different FRP systems. The guidelines are presented in AASHTO LRFD format to facilitate use and incorporation into the AASHTO "LRFD Bridge Design Specifications." Also, the report presents recommended changes to the AASHTO "LRFD Bridge Design Specifications" to introduce provisions pertaining to the use of FRP systems for strengthening concrete girders in shear. The material contained in the report should be of immediate interest to state bridge engineers and those involved in the strengthening and repair of concrete structures using FRP systems.
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This report provides an evaluation of existing "AASHTO LRFD Bridge Design Specifications" relevant to the use of high-strength reinforcing steel and other grades of reinforcing steel having no discernible yield plateau. The report also includes recommended language to the "AASHTO LRFD Bridge Design Specifications" that will permit the use of high-strength reinforcing steel with specified yield strengths not greater than 100 ksi. The material in this report will be of immediate interest to bridge engineers.
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