The two primary obstacles for applying bridge life-cycle cost analysis (BLCCA) have been the lack of a uniformly accepted methodology and the lack of access to reliable cost and service life personnel. There is also an apparent conflict with the least-first-cost method of contract administration. The lack of a rational approach to the consideration of important factors such as obsolescence, bridge vulnerability to extreme events, and the uncertainty in the cost and timing of repairs has also hindered the use of life-cycle costing in the past. This report and the BLCCA methodology developed as part of NCHRP Project 12-43 provide a framework for carrying out BLCCA and explicitly consider obsolescence, bridge vulnerability, and uncertainty. Cost parameters are included with recommended default values. The methodology provides the flexibility to add additional cost parameters identified in future research. This methodology is augmented by a BLCCA software package (with User's Manual), which automates the analysis process, and by a Guidance Manual, which describes the BLCCA process.
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Structural Supports for Highway Signs, Luminaires, and Traffic Signals
Author: Fouad, F H Davidson, J S Delatte, N Calvert, E A CHEN, S-E Nunez, E Abdalla, R | Size: 459 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 58 | ISBN: 0309087538
This report contains the findings of a study to develop recommended revisions to the AASHTO "Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals." The report describes the research effort and provides recommendations for updating and refining the specifications. A strategic plan for further enhancement of the specifications and for conversion of the specifications to load and resistance factor format is also included. The material in this report will be of immediate interest to specification writers, structural engineers, and designers.
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Posted by: mahyarov - 10-24-2012, 10:03 AM - Forum: Concrete
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Application of Fiber-Reinforced Polymer Composites to the Highway Infrastructure
Author: Mertz, D R Chajes, M J Gillespie Jr, J W Kukich, D S Sabol, S A Hawkins, N M Aquino, W Deen, T B | Size: 513 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 87 | ISBN: 0309087694
This report contains the findings of a study to develop a strategic plan for guiding the application of fiber reinforced polymer composites in the highway infrastructure. The report describes the research effort and presents the strategic plan. The material in this report will be of immediate interest to bridge engineers interested in increasing the use of fiber reinforced polymer composites.
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Posted by: mahyarov - 10-24-2012, 10:01 AM - Forum: Concrete
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Prestress Losses in Pretensioned High-Strength Concrete Bridge Girders
Author: Tadros, M K Al-Omaishi, N Seguirant, S J Gallt, J G | Size: 1.39 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 71 | ISBN: 030908766X
This report presents guidelines to help bridge designers obtain realistic estimates of prestress losses in high-strength pretensioned concrete bridge girders and thus achieve economical designs. These guidelines incorporate procedures that yield more accurate predictions of modulus of elasticity, shrinkage, and creep of concrete and more realistic estimates of prestress losses than those provided by the procedures contained in current specifications. This report will be of particular interest to engineers, researchers, and others concerned with the design of pretensioned concrete bridge structures.
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Geometric Design Consistency on High-Speed Rural Two-Lane Roadways
Author: Wooldridge, M D Fitzpatrick, K Harwood, D W Potts, I B Elefteriadou, Lily | Size: 809 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 93 | ISBN: 0309087686
This report discusses geometric design consistency, particularly for rural roads. It presents rules on geometric design consistency suitable for use in an expert system such as the Interactive Highway Safety Design Model (IHSDM). The rules can also be used directly by a designer to evaluate roadway designs or to conduct reviews of existing roadways, improving design consistency and safety.
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Review of Truck Characteristics as Factors in Roadway Design
Author: Harwood, D W Torbic, D J Richard, K R Glauz, W D Elefteriadou, Lily | Size: 5.09 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 194 | ISBN: 0309087791
This report presents guidance for roadway geometric designers on how best to accommodate large trucks on the U.S. highway system. Under National Cooperative Highway Research Program (NCHRP) Project 15-21, a research team reviewed the range of dimensions and performance characteristics of trucks currently used on U.S. highways and predicted how these characteristics may change in response to current political, economic, and technological trends. The research team conducted an analysis of those geometric design features affected by vehicle characteristics and then evaluated the adequacy of current geometric design policy to accommodate the current and anticipated truck fleet. Based on the findings, the report makes recommendations for a number of changes to the American Association of State Highway and Transportation Officials (AASHTO) "Policy on Geometric Design of Highways and Streets" ("Green Book"). The report (1) provides valuable guidance for designers of roads and facilities that need to accommodate large trucks and (2) will assist AASHTO in updating geometric design policy. The information developed in this project will also be useful as input to future editions of other documents such as the Transportation Research Board (TRB) "Highway Capacity Manual," the Federal Highway Administration (FHWA) "Manual on Uniform Traffic Control Devices," and the AASHTO "Roadside Design Guide."
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Posted by: mahyarov - 10-24-2012, 09:48 AM - Forum: Concrete
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Effects of Subsurface Drainage on Performance of Asphalt and Concrete Pavements
Author: Hall, K T Correa, C E | Size: 962 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 60 | ISBN: 0309087589
This report contains the findings of a study to develop a methodology for estimating the impact of changes in truck weight limits on bridge network costs. The report describes the research effort and the recommended methodology and illustrates application of the methodology. A software module for automation of the recommended methodology also is included. The material in this report will be of immediate interest to bridge engineers and planners.
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Author: Fu, G Feng, J Dekelbab, W Moses, F Cohen, H Mertz, D THOMPSON, P | Size: 2.05 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2003 | pages: 197 | ISBN: 0309087597
This report contains the findings of a study to develop a methodology for estimating the impact of changes in truck weight limits on bridge network costs. The report describes the research effort and the recommended methodology and illustrates application of the methodology. A software module for automation of the recommended methodology also is included. The material in this report will be of immediate interest to bridge engineers and planners.
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Posted by: ir_71 - 10-24-2012, 09:42 AM - Forum: Archive
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Dear friends,
I'm looking for the new edition of BS EN 12504-2 from 2012 entitled: "Testing concrete in structures - Part 2: Non-destructive testing - Determination of rebound number".
If someone of you have it - please share it with me.
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