Cast-in-Place Concrete Connections for Precast Deck Systems
Author: French, C E | Size: 17.88 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 782 | ISBN: -
This report contains recommended design specifications, construction specifications, and five illustrative examples of durable cast-in-place (CIP) reinforced concrete connections for precast deck systems that emulate monolithic construction, considering issues including speed of construction, durability, and fatigue. Included in the report is the supporting research that led to these recommendations. This research focused on systems that reduce the need to place and remove formwork thus accelerating on-site construction and improving safety. The three systems considered to accomplish these objectives were: (1) a precast composite slab span system (PCSSS) for short to moderate span structures, (2) full-depth prefabricated concrete decks, and (3) deck joint closure details (e.g., decked-bulb-tee (DBT) flange connections) for precast prestressed concrete girder systems for long span structures. Depending on the system, the connections are either transverse (i.e., across the width of the bridge) or longitudinal (i.e., along the length of the bridge). The first system, PCSSS, is an entire bridge system; whereas the other two systems investigated in the project represented transverse and longitudinal joint details to transfer moment and shear in precast deck panels and flanges of decked bulb tees. Two types of connection concepts were explored with these details, looped bar details and two layers of headed bar details.
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Evaluation of Bridge Scour Research: Pier Scour Processes and Predictions
Author: Ettema, Robert University of Wyoming, Laramie Constantinescu, George University of Iowa, Iowa City Melville, Bruce University of Auckland | Size: 4.42 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 195 | ISBN: -
This report explores the current state of knowledge regarding bridge pier scour, assesses several methods for design estimates of scour depth, examines a structured methodology for scour depth estimation for design purposes, and highlights aspects of pier scour in need of potential further research. It focuses particularly on research information obtained since 1990, showing that this information provides considerable new insights that compel the need to change the design method currently recommended by the principal authoritative design guides and used widely by bridge engineering practitioners. Additionally, it indicates that several important aspects of pier scour processes remain inadequately understood and not yet incorporated into design methods.
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Cost-Effective Connection Details for Highway Sign, Luminaire, and Traffic Signal Structures
Author: Roy, S Lehigh University Park, Y C Lehigh University Sause, R Lehigh University Fisher, J W Lehigh University Kaufmann, E J Lehigh University | Size: 9.73 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 236 | ISBN: -
This report documents the results of a comprehensive experimental and analytical study that evaluated fatigue performance of several critical welded connections in the highway sign, signal and high-level luminaire support structures. In this study, infinite life fatigue resistance of connection details in the existing inventory was established and new cost-effective fatigue resistant connections were developed. About 80 full size galvanized specimens of sign, signal and high-level luminaire support structures containing different welded connections were fatigue tested. Using parametric Finite Element Analyses (FEA) of 3D models verified by test data, fatigue performance of the connections in both finite and infinite life regimes were defined in terms of fatigue stress concentration factors over the range of applicable geometric dimensions. The study demonstrated that tube-to-transverse plate connections are the most fatigue critical details in the subject structures. Increasing the stiffness of the transverse plate is the most cost-effective means of improving fatigue resistance of this connection. Groove welded connections with smaller opening in the plate exhibits largest fatigue resistance. Sharper bend radius and less number of sides reduce fatigue threshold of connections in multi-sided sections. Based on these research findings, new specification recommendations were proposed for revision to the existing AASHTO specifications.
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Simulation of Stochastic Processes by Spectral Representation
Appl. Mech. Rev. -- April 1991 -- Volume 44, Issue 4, 191 (14 pages)
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DIN 4124: Title (English): Excavations and trenches - Slopes, planking and strutting breadths of working spaces.
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This circular explores the state of the practice and representative applications on the use of inclinometer systems for measuring ground deformation and performance of geotechnical design elements on transportation projects. The report examines inclinometer components and installation details, and includes information on planning inclinometer installation, acquiring and displaying data, and interpreting test results.
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Geophysical Methods Commonly Employed for Geotechnical Site Characterization
Author: Anderson, Neil L | Size: 1.35 MB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2008 | pages: 44
This circular offers an overview of 12 geotechnical geophysical methods that are commonly applied to transportation projects. Geotechnical geophysics is the application of geophysics to geotechnical engineering problems; such investigations normally extend to total depths of less than 300 ft. Geotechnical geophysical surveys are performed on the ground surface, within boreholes and water, and from the air. Using illustrations and brief examples, commonly employed geotechnical geophysical methods are described. Through summary tables and brief discussions, common applications of engineering geophysics are presented. Chapters are devoted to the selection of appropriate geophysical methods and geophysical contractors, respectively. Use of geophysics by transportation agencies is reviewed through a summary of NCHRP Synthesis 357: "Use of Geophysics for Transportation Projects" (Sirles, 2006). A detailed description of applications of geophysical methods to highway-related problems may be found at www.cflhd.gov/agm/index.htm.
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Author: Chiu, Yi-Chang Bottom, Jon Mahut, Michael Paz, Alex Balakrishna, Ramachandran Waller, Travis Hicks, Jim | Size: 553 KB | Format:PDF | Quality:Original preprint | Publisher: Transportation Research Board | Year: 2011 | pages: 62
This circular is designed to help explain the basic concepts and definitions of dynamic traffic assignment (DTA) models and addresses the application, selection, planning, and execution of a DTA model. The report also describes the general DTA modeling procedure and modeling issues that may concern a model user.
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This workshop’s mission was to inform the pavement engineering community on the completed and on-going efforts related to assessing the sensitivity of the Mechanistic– Empirical Pavement Design Guide (MEPDG). Specifically, the workshop was concerned with those parameters that had an impact on flexible pavement analysis and design. Many transportation agencies have been involved in various studies to look at particular parts of the MEPDG, but much of this work had not been compiled into a single document. As such, a workshop was proposed by the Transportation Research Board (TRB) Flexible Pavement Design Committee (AFD60) and approved by TRB to look at the flexible pavement sensitivity analysis in the MEPDG. Once accepted, a planning team was established to develop the workshop by collecting and disseminating the work done by transportation agencies. The workshop planning team had two primary goals: (1) Take a snapshot of the current implementation status of transportation agencies through a questionnaire and reporting on workshops hosted by the Federal Highway Administration and (2) Invite transportation agencies based on their responses to the questionnaire to present on a specific subject or overall research implementation effort. Additionally, the planning team wanted to capture and present current National Cooperative Highway Research Program research related to flexible pavement analysis and performance. Workshop Session 143, held in January 2010, met these goals by providing presentations on various efforts related to understanding the sensitivity of flexible pavement performance using the MEPDG inputs.
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Author: John W. Fisher | Size: 4,4 MB | Format:PDF | Quality:Original preprint | Publisher: Lehigh University | Year: 1998 | pages: 139
TABLE OF CONTENTS
1 Introduction
2 Basic Fracture Mechanics Concepts
3 Fatigue Strength Analysis
4 Fatigue Assessment Procedures for Variable Stress Ranges
5 Fatigue Design According to the American Association of State Highway andTransportation Officials Specification (AASHTO)
6 Distortion-Inducted Fatigue Cracking
7 Inspection and Repair of Fatigue Cracks
8 Special Topics
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