Performance Characteristics Of In Service Bridges For Enhancing Load Ratings Leveraging Refined Analysis Methods

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Performance Characteristics of In-Service Bridges for Enhancing Load Ratings: Leveraging Refined Analysis Methods

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Author : Devin K. Harris
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (126 download)

Book Synopsis Performance Characteristics of In-Service Bridges for Enhancing Load Ratings: Leveraging Refined Analysis Methods by : Devin K. Harris

Download or read book Performance Characteristics of In-Service Bridges for Enhancing Load Ratings: Leveraging Refined Analysis Methods written by Devin K. Harris and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge load rating assesses the safe live load carrying capacity of an existing or newly designed structure. In addition to load rating with previously defined standard load rating vehicles, the Federal Highway Administration issued additional guidance to states related to rating requirements for all the bridges with respect to specialized hauling vehicles and emergency vehicles that must be met by the end of 2022. It is recognized that the load effects (bending moment and shear) produced by these vehicle types on certain bridge types and spans might be greater than those caused by the previous rating vehicles. Therefore, a number of bridges within VDOT's inventory may require posting when rated with these specialized vehicles. The goal of this study was to assess the likelihood of an increase in load rating factors through refined analysis methods for the bridge classes potentially vulnerable to load ratings under consideration of the new federal regulations and when using conventional, simplified equations for load distribution factors. In particular, the study focused on the evaluation of live load distribution factors for girder bridges and effective widths for distributing live loads in slab bridges through refined analysis. Three bridge classes (simple span steel girder bridges, reinforced concrete T-beam bridges, and concrete slab bridges) were selected for this refined analysis. Girder bridges were modeled using the plate-with-an-eccentric-beam analysis approach, while plate elements were used to model slab bridges within the LARSA 4D software package. The selected modeling approaches were validated through the simulation of the bridge structures with available field-testing results from the literature. A total of 71 in-service bridges belonging to the three selected bridge classes were then modeled and analyzed to compute the load distribution factors for girder bridges or effective widths for slab bridges, and the results were compared with those obtained from the code-specified equations. Using the data obtained from these numerical simulations, a series of multi-parameter linear regression models were developed to predict the percent change in distribution factor and effective width, respectively, for girder and slab bridges with different geometrical characteristics if a refined method analysis is implemented. The regression models were limited to four parameters such that the results from regression models could be presented in table format. The developed tables should be used as screening tools to provide guidance on the use of refined methods of analysis to improve the load ratings of bridges vulnerable to posting from previously existing load rating classifications as well as the recently introduced vehicles. Should VDOT use refined methods of analysis, there is good potential that the agency can avoid posting a substantial portion of its inventory, saving resources for more critical needs while safely keeping Virginia's bridges open for commerce and the traveling public

Load Rating Strategies for Bridges With Limited Or Missing As-Built Information

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Author : Devin K. Harris
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (122 download)

Book Synopsis Load Rating Strategies for Bridges With Limited Or Missing As-Built Information by : Devin K. Harris

Download or read book Load Rating Strategies for Bridges With Limited Or Missing As-Built Information written by Devin K. Harris and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Load rating is the process of determining the safe load-carrying capacity of a bridge; however, when plans and details are insufficient to determine the overall capacity of the structure, alternative methods must be used to infer what the live load capacity is. Two viable methods allowed by the AASHTO Manual for Bridge Evaluation are the commonly used but subjective engineering judgement and the experimentally based proof testing. However, these methods suffer from limitations. Engineering judgement typically is not based on physical phenomena and creates a degree of risk in unconservative estimates or unnecessarily restricts traffic and commerce if estimates are overly conservative. On the contrary, proof testing can cause damage during testing, tends to be expensive, and cannot be extrapolated to future performance. Thus, the objective of this study was to develop rational engineering approaches for load rating structures within the Virginia Department of Transportation (VDOT) inventory for which limited as-built information is available. The initial phase of the investigation focused on categorizing the VDOT inventory to determine the types of structures that are likely to be missing information necessary for an analytical load rating, which were identified to be short span reinforced concrete slab or T-beam designs. Subsequent phases emphasized two main approaches to load rating: (i) structural identification frameworks based on finite element model updating; and (ii) leveraged vibration response characterization. Both approaches emphasized estimating unknown characteristics of these types of structures for use in a traditional analytical load rating. These unknown parameters include modulus of elasticity and strength of concrete as well as cross-sectional area of steel reinforcement. These estimates can ultimately be used to provide a rational estimate of load ratings. All approaches were evaluated on two slab and two T-beam structures in varying condition states, which had sufficient plans available, but were treated as having varying degrees of unknown details. The results illustrated that the finite element model updating method generated load ratings that were within 0% to -17% of the load ratings developed according to conventional calculations, with negative differences indicating lower rating factor estimates; and the vibration-based simplified method led to results with a percent difference ranging from 16% to -16%. It was also shown that instrumenting bridges with a limited number of sensors is sufficient for successful implementation of the developed methods. The results from the study have been synthesized into recommendations for VDOT to perform load ratings of structures with insufficient plans or information, with the goal of minimizing the degree and complexity of experimental measurement as well as simplifying the tools for performing the analyses of these structures as much as feasible.

Development of a Strategy to Address Load-posted Bridges Through Reduction in Uncertainty in Load Ratings

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Author : Mary Beth Deisz Hueste
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (134 download)

Book Synopsis Development of a Strategy to Address Load-posted Bridges Through Reduction in Uncertainty in Load Ratings by : Mary Beth Deisz Hueste

Download or read book Development of a Strategy to Address Load-posted Bridges Through Reduction in Uncertainty in Load Ratings written by Mary Beth Deisz Hueste and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maintaining the functionality of the transportation infrastructure depends on the successful management of aging bridge assets. Departments of Transportation rely on the load rating process to evaluate the sufficiency of the bridge structures in their state, and post load restrictions if the capacity of a bridge does not meet the maximum load effect based on the current legal loads. Removing load postings is always of interest because there can be commerce, traffic, and emergency egress issues due to rerouting of vehicles. Posted structures come in various shapes and sizes, built in different eras and environments, and exhibit vastly different structural behaviors. As such, there is no clear-cut single solution for addressing the possibility of removing postings. In this study, strategies have been developed to reduce uncertainty in load rating procedure in a safe and appropriate manner to potentially increase or remove the load postings of typical steel and concrete bridges. The Volume 1 Report documents findings including a review of the state-of-the-practice and state-of-the-art for load rating existing bridges, a review and synthesis of the bridge characteristics of load posted bridges in Texas, and the basic load rating analysis conducted for selected representative bridges to identify the controlling limit states. The Volume 2 Report provides details of further study for typical bridges including refined analysis for more accurate prediction of load distribution, load testing, model updating and calibration, and refined load rating analysis. This Volume 3 Report provides specific recommendations for refined load rating analysis for the four selected bridges types, and provides detailed refined load rating examples for each bridge type. The effect of each refinement on the revised load ratings is evaluated, and the implications for potentially increasing the posted loads or removal of load posting are discussed.

Digital and Social Media Marketing

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Author : Nripendra P. Rana
Publisher : Springer Nature
ISBN 13 : 3030243745
Total Pages : 337 pages
Book Rating : 4.0/5 (32 download)

Book Synopsis Digital and Social Media Marketing by : Nripendra P. Rana

Download or read book Digital and Social Media Marketing written by Nripendra P. Rana and published by Springer Nature. This book was released on 2019-11-11 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines issues and implications of digital and social media marketing for emerging markets. These markets necessitate substantial adaptations of developed theories and approaches employed in the Western world. The book investigates problems specific to emerging markets, while identifying new theoretical constructs and practical applications of digital marketing. It addresses topics such as electronic word of mouth (eWOM), demographic differences in digital marketing, mobile marketing, search engine advertising, among others. A radical increase in both temporal and geographical reach is empowering consumers to exert influence on brands, products, and services. Information and Communication Technologies (ICTs) and digital media are having a significant impact on the way people communicate and fulfil their socio-economic, emotional and material needs. These technologies are also being harnessed by businesses for various purposes including distribution and selling of goods, retailing of consumer services, customer relationship management, and influencing consumer behaviour by employing digital marketing practices. This book considers this, as it examines the practice and research related to digital and social media marketing.

Social Science Research

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Author : Anol Bhattacherjee
Publisher : CreateSpace
ISBN 13 : 9781475146127
Total Pages : 156 pages
Book Rating : 4.1/5 (461 download)

Book Synopsis Social Science Research by : Anol Bhattacherjee

Download or read book Social Science Research written by Anol Bhattacherjee and published by CreateSpace. This book was released on 2012-04-01 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed to introduce doctoral and graduate students to the process of conducting scientific research in the social sciences, business, education, public health, and related disciplines. It is a one-stop, comprehensive, and compact source for foundational concepts in behavioral research, and can serve as a stand-alone text or as a supplement to research readings in any doctoral seminar or research methods class. This book is currently used as a research text at universities on six continents and will shortly be available in nine different languages.

Fatigue and Fracture

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Author : F. C. Campbell
Publisher : ASM International
ISBN 13 : 1615039767
Total Pages : 699 pages
Book Rating : 4.6/5 (15 download)

Book Synopsis Fatigue and Fracture by : F. C. Campbell

Download or read book Fatigue and Fracture written by F. C. Campbell and published by ASM International. This book was released on 2012-01-01 with total page 699 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book emphasizes the physical and practical aspects of fatigue and fracture. It covers mechanical properties of materials, differences between ductile and brittle fractures, fracture mechanics, the basics of fatigue, structural joints, high temperature failures, wear, environmentally-induced failures, and steps in the failure analysis process."--publishers website.

Dictionary of Occupational Titles

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Author :
Publisher :
ISBN 13 :
Total Pages : 854 pages
Book Rating : 4.3/5 (91 download)

Book Synopsis Dictionary of Occupational Titles by :

Download or read book Dictionary of Occupational Titles written by and published by . This book was released on 1965 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supplement to 3d ed. called Selected characteristics of occupations (physical demands, working conditions, training time) issued by Bureau of Employment Security.

Dictionary of Occupational Titles: Definitions of titles

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Author : United States Employment Service
Publisher :
ISBN 13 :
Total Pages : 846 pages
Book Rating : 4.:/5 (89 download)

Book Synopsis Dictionary of Occupational Titles: Definitions of titles by : United States Employment Service

Download or read book Dictionary of Occupational Titles: Definitions of titles written by United States Employment Service and published by . This book was released on 1965 with total page 846 pages. Available in PDF, EPUB and Kindle. Book excerpt:

High-leverage Practices in Special Education

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Author : Council for Exceptional Children
Publisher :
ISBN 13 : 9780865865266
Total Pages : 0 pages
Book Rating : 4.8/5 (652 download)

Book Synopsis High-leverage Practices in Special Education by : Council for Exceptional Children

Download or read book High-leverage Practices in Special Education written by Council for Exceptional Children and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special education teachers, as a significant segment of the teaching profession, came into their own with the passage of Public Law 94-142, the Education for All Handicapped Children Act, in 1975. Since then, although the number of special education teachers has grown substantially it has not kept pace with the demand for their services and expertise. The roles and practice of special education teachers have continuously evolved as the complexity of struggling learners unfolded, along with the quest for how best to serve and improve outcomes for this diverse group of students. High-Leverage Practices in Special Education defines the activities that all special educators needed to be able to use in their classrooms, from Day One. HLPs are organized around four aspects of practice collaboration, assessment, social/emotional/behavioral practices, and instruction because special education teachers enact practices in these areas in integrated and reciprocal ways. The HLP Writing Team is a collaborative effort of the Council for Exceptional Children, its Teacher Education Division, and the CEEDAR Center; its members include practitioners, scholars, researchers, teacher preparation faculty, and education advocates--Amazon.com

How Learning Works

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Author : Susan A. Ambrose
Publisher : John Wiley & Sons
ISBN 13 : 0470617608
Total Pages : 336 pages
Book Rating : 4.4/5 (76 download)

Book Synopsis How Learning Works by : Susan A. Ambrose

Download or read book How Learning Works written by Susan A. Ambrose and published by John Wiley & Sons. This book was released on 2010-04-16 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Praise for How Learning Works "How Learning Works is the perfect title for this excellent book. Drawing upon new research in psychology, education, and cognitive science, the authors have demystified a complex topic into clear explanations of seven powerful learning principles. Full of great ideas and practical suggestions, all based on solid research evidence, this book is essential reading for instructors at all levels who wish to improve their students' learning." —Barbara Gross Davis, assistant vice chancellor for educational development, University of California, Berkeley, and author, Tools for Teaching "This book is a must-read for every instructor, new or experienced. Although I have been teaching for almost thirty years, as I read this book I found myself resonating with many of its ideas, and I discovered new ways of thinking about teaching." —Eugenia T. Paulus, professor of chemistry, North Hennepin Community College, and 2008 U.S. Community Colleges Professor of the Year from The Carnegie Foundation for the Advancement of Teaching and the Council for Advancement and Support of Education "Thank you Carnegie Mellon for making accessible what has previously been inaccessible to those of us who are not learning scientists. Your focus on the essence of learning combined with concrete examples of the daily challenges of teaching and clear tactical strategies for faculty to consider is a welcome work. I will recommend this book to all my colleagues." —Catherine M. Casserly, senior partner, The Carnegie Foundation for the Advancement of Teaching "As you read about each of the seven basic learning principles in this book, you will find advice that is grounded in learning theory, based on research evidence, relevant to college teaching, and easy to understand. The authors have extensive knowledge and experience in applying the science of learning to college teaching, and they graciously share it with you in this organized and readable book." —From the Foreword by Richard E. Mayer, professor of psychology, University of California, Santa Barbara; coauthor, e-Learning and the Science of Instruction; and author, Multimedia Learning

Fatigue Design (ESIS 16)

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Author : J. Solin
Publisher : Wiley-Blackwell
ISBN 13 :
Total Pages : 376 pages
Book Rating : 4.3/5 (91 download)

Book Synopsis Fatigue Design (ESIS 16) by : J. Solin

Download or read book Fatigue Design (ESIS 16) written by J. Solin and published by Wiley-Blackwell. This book was released on 1993-03-02 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compilation of research in fatigue design, prediction, and assessment Fatigue Design is a collection of research presented at the 1993 International Symposium on Fatigue Design. Detailing the latest findings and most current research, this book features papers on a variety of pertinent topics, including the quantification of service load for fatigue life predictions, identification of stress states and failure modes, assessment of residual life in damaged components, and more. Special attention is paid to the need for simple and reliable prediction tools to help better ensure adequate strength at the design stage.

Leveraging Big Data Analytics to Improve Military Recruiting

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Author : Nelson Lim
Publisher :
ISBN 13 : 9781977403421
Total Pages : 0 pages
Book Rating : 4.4/5 (34 download)

Book Synopsis Leveraging Big Data Analytics to Improve Military Recruiting by : Nelson Lim

Download or read book Leveraging Big Data Analytics to Improve Military Recruiting written by Nelson Lim and published by . This book was released on 2019-11-30 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors identified current, desired, and prospective data-enabled practices that the U.S. Department of Defense and the services might be able to deploy in their outreach and recruiting processes.

ITS Annual Report

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Author : University of California (System). Institute of Transportation Studies
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.3/5 (555 download)

Book Synopsis ITS Annual Report by : University of California (System). Institute of Transportation Studies

Download or read book ITS Annual Report written by University of California (System). Institute of Transportation Studies and published by . This book was released on 1982 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Basic Methods of Policy Analysis and Planning

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Author : Carl Patton
Publisher : Routledge
ISBN 13 : 1317350006
Total Pages : 481 pages
Book Rating : 4.3/5 (173 download)

Book Synopsis Basic Methods of Policy Analysis and Planning by : Carl Patton

Download or read book Basic Methods of Policy Analysis and Planning written by Carl Patton and published by Routledge. This book was released on 2015-08-26 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Updated in its 3rd edition, Basic Methods of Policy Analysis and Planning presents quickly applied methods for analyzing and resolving planning and policy issues at state, regional, and urban levels. Divided into two parts, Methods which presents quick methods in nine chapters and is organized around the steps in the policy analysis process, and Cases which presents seven policy cases, ranging in degree of complexity, the text provides readers with the resources they need for effective policy planning and analysis. Quantitative and qualitative methods are systematically combined to address policy dilemmas and urban planning problems. Readers and analysts utilizing this text gain comprehensive skills and background needed to impact public policy.

National Education Technology Plan

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Author : Arthur P. Hershaft
Publisher :
ISBN 13 : 9781613246368
Total Pages : 0 pages
Book Rating : 4.2/5 (463 download)

Book Synopsis National Education Technology Plan by : Arthur P. Hershaft

Download or read book National Education Technology Plan written by Arthur P. Hershaft and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Education is the key to America's economic growth and prosperity and to our ability to compete in the global economy. It is the path to higher earning power for Americans and is necessary for our democracy to work. It fosters the cross-border, cross-cultural collaboration required to solve the most challenging problems of our time. The National Education Technology Plan 2010 calls for revolutionary transformation. Specifically, we must embrace innovation and technology which is at the core of virtually every aspect of our daily lives and work. This book explores the National Education Technology Plan which presents a model of learning powered by technology, with goals and recommendations in five essential areas: learning, assessment, teaching, infrastructure and productivity.

The Science of Learning and Development

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Author : Pamela Cantor
Publisher : Routledge
ISBN 13 : 100039977X
Total Pages : 245 pages
Book Rating : 4.0/5 (3 download)

Book Synopsis The Science of Learning and Development by : Pamela Cantor

Download or read book The Science of Learning and Development written by Pamela Cantor and published by Routledge. This book was released on 2021-06-21 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: This essential text unpacks major transformations in the study of learning and human development and provides evidence for how science can inform innovation in the design of settings, policies, practice, and research to enhance the life path, opportunity and prosperity of every child. The ideas presented provide researchers and educators with a rationale for focusing on the specific pathways and developmental patterns that may lead a specific child, with a specific family, school, and community, to prosper in school and in life. Expanding key published articles and expert commentary, the book explores a profound evolution in thinking that integrates findings from psychology with biology through sociology, education, law, and history with an emphasis on institutionalized inequities and disparate outcomes and how to address them. It points toward possible solutions through an understanding of and addressing the dynamic relations between a child and the contexts within which he or she lives, offering all researchers of human development and education a new way to understand and promote healthy development and learning for diverse, specific youth regardless of race, socioeconomic status, or history of adversity, challenge, or trauma. The book brings together scholars and practitioners from the biological/medical sciences, the social and behavioral sciences, educational science, and fields of law and social and educational policy. It provides an invaluable and unique resource for understanding the bases and status of the new science, and presents a roadmap for progress that will frame progress for at least the next decade and perhaps beyond.

Highway Quality Compendium

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Author :
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (1 download)

Book Synopsis Highway Quality Compendium by :

Download or read book Highway Quality Compendium written by and published by . This book was released on 2007 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: