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Calibration Of Fatigue Design Factors And Fatigue Life Reliability Of Steel Highway Bridges Using Wim Databases
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Book Synopsis Calibration of Fatigue Design Factors and Fatigue Life Reliability of Steel Highway Bridges Using WIM Databases by : Ahmed Mostafa Tawfik Farag
Download or read book Calibration of Fatigue Design Factors and Fatigue Life Reliability of Steel Highway Bridges Using WIM Databases written by Ahmed Mostafa Tawfik Farag and published by . This book was released on 2015 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue life assessment of steel highway bridges is crucial to maintain their safety. Researches are required to quantify uncertainties in loading, resistance, fatigue life prediction and improvement techniques. This study calibrates some fatigue code parameters and models fatigue loading probabilistically using truck data in Canada. Fatigue life improvement by weld toe grinding is assessed experimentally and numerically. Finally, the remaining fatigue life using reliability-based method for cruciform bridge welded detail is predicted. Truck data screening is vital to ensure its quality in calibration and load history prediction. Three different fatigue truck factors and equivalent number of cycles are proposed, using single and dual slope curves, for three bridge span ranges. Span length and fatigue category affected the calibration in short spans and dual slope curves. Using Ontario and Quebec data, probabilistic distributions for stress-range histograms for bridge spans and configurations are developed. Weld toe grinding improved the fatigue life by 60% for category E joint compared to the non-ground specimen. Still, weld imperfections might adverse grinding effect. In deterministic fatigue life prediction, energy-based approach is used for crack initiation, while linear elastic fracture mechanics is used for crack propagation. An initial spherical flaw size of 0.1 mm with no residual stresses leads to the most precise prediction of fatigue resistance for test specimens. For the probabilistic fatigue life prediction of cruciform detail of 6.4 mm fillet weld size, the fatigue life of the concave weld profiles are usually larger than the convex ones. The study developed a method to convert the probabilistic stress range into number of cycles for remaining fatigue life reliability of steel detail. The generated reliability illustrates the fatigue repair and inspection management.
Book Synopsis Fatigue Evaluation of Steel Bridges by : Mark Douglas Bowman
Download or read book Fatigue Evaluation of Steel Bridges written by Mark Douglas Bowman and published by Transportation Research Board. This book was released on 2012 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: "TRB's National Cooperative Highway Research Program (NCHRP) Report 721: Fatigue Evaluation of Steel Bridges provides proposed revisions to Section 7--Fatigue Evaluation of Steel Bridges of the American Association of State Highway and Transportation Officials Manual for Bridge Evaluation with detailed examples of the application of the proposed revisions."--Publisher's description.
Book Synopsis Implementation of Reliability Based Design and Evaluation for Highway Bridge Fatigue Life by : Surya K. Raju
Download or read book Implementation of Reliability Based Design and Evaluation for Highway Bridge Fatigue Life written by Surya K. Raju and published by . This book was released on 1988 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Evaluation Procedures for Steel Bridges by : Fred Moses
Download or read book Fatigue Evaluation Procedures for Steel Bridges written by Fred Moses and published by Transportation Research Board National Research. This book was released on 1987 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Reliability and Fracture Behavior of Highway Steel Bridges by : Androula Y. Michael
Download or read book Fatigue Reliability and Fracture Behavior of Highway Steel Bridges written by Androula Y. Michael and published by . This book was released on 1989 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Reliability of Steel Highway Bridge Details by : Peter J. Massarelli
Download or read book Fatigue Reliability of Steel Highway Bridge Details written by Peter J. Massarelli and published by . This book was released on 2001 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The expected life of a steel highway bridge subjected to random, variable-amplitude traffic cycles is highly dependent on damage accumulation caused by various fatigue mechanisms. This study addressed some of the issues associated with developing probabilistic reliability models for steel bridge structures under vehicular traffic loadings. Specifically, methods for incorporating inspection data (e.g., the presence and size of cracks) into classical and fracture mechanics-based fatigue models to predict fracture-critical element damage accumulation were analyzed. The block loading method introduced here assigns a damage state to the cracked detail after each vehicle passage. This method is limited to loading blocks where the plastic zone at the crack tip developed by the pseudo-static response of the bridge must be larger than the crack growth caused by the subsequent dynamic cycles for each vehicle passage. It must also be assumed that the crack length is fixed during a loading block. This method accounts for closure effects by predicting the occurrence of damage only when the crack is opened. When a bridge inspection reveals fatigue cracks, field data in the form of strain measurements can be collected in the vicinity of the fracture detail to identify the characteristic stress block and the fluctuations in the curve attributes attributable to randomness of the traffic loading. Then, the data can be analyzed to identify the statistical properties of the attribute parameters, which include the magnitude of the pseudo-static response, the number of dynamic cycles in each block, and the duration of the vehicle passage. With this information, the distribution of stress blocks can be estimated, and the block loading method can be employed to calculate the fatigue lifetime of each critical detail.
Book Synopsis Fatigue Life Analyses of Welded Structures by : Tom Lassen
Download or read book Fatigue Life Analyses of Welded Structures written by Tom Lassen and published by John Wiley & Sons. This book was released on 2013-03-01 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Avoiding or controlling fatigue damage is a major issue in the design and inspection of welded structures subjected to dynamic loading. Life predictions are usually used for safe life analysis, i.e. for verifying that it is very unlikely that fatigue damage will occur during the target service life of a structure. Damage tolerance analysis is used for predicting the behavior of a fatigue crack and for planning of in-service scheduled inspections. It should be a high probability that any cracks appearing are detected and repaired before they become critical. In both safe life analysis and the damage tolerance analysis there may be large uncertainties involved that have to be treated in a logical and consistent manner by stochastic modeling. This book focuses on fatigue life predictions and damage tolerance analysis of welded joints and is divided into three parts. The first part outlines the common practice used for safe life and damage tolerance analysis with reference to rules and regulations. The second part emphasises stochastic modeling and decision-making under uncertainty, while the final part is devoted to recent advances within fatigue research on welded joints. Industrial examples that are included are mainly dealing with offshore steel structures. Spreadsheets which accompany the book give the reader the possibility for hands-on experience of fatigue life predictions, crack growth analysis and inspection planning. As such, these different areas will be of use to engineers and researchers.
Book Synopsis Metal Fatigue Analysis Handbook by : Yung-Li Lee
Download or read book Metal Fatigue Analysis Handbook written by Yung-Li Lee and published by Elsevier. This book was released on 2011-08-17 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understand why fatigue happens and how to model, simulate, design and test for it with this practical, industry-focused reference Written to bridge the technology gap between academia and industry, the Metal Fatigue Analysis Handbook presents state-of-the-art fatigue theories and technologies alongside more commonly used practices, with working examples included to provide an informative, practical, complete toolkit of fatigue analysis. Prepared by an expert team with extensive industrial, research and professorial experience, the book will help you to understand: Critical factors that cause and affect fatigue in the materials and structures relating to your work Load and stress analysis in addition to fatigue damage-the latter being the sole focus of many books on the topic How to design with fatigue in mind to meet durability requirements How to model, simulate and test with different materials in different fatigue scenarios The importance and limitations of different models for cost effective and efficient testing Whilst the book focuses on theories commonly used in the automotive industry, it is also an ideal resource for engineers and analysts in other disciplines such as aerospace engineering, civil engineering, offshore engineering, and industrial engineering. The only book on the market to address state-of-the-art technologies in load, stress and fatigue damage analyses and their application to engineering design for durability Intended to bridge the technology gap between academia and industry - written by an expert team with extensive industrial, research and professorial experience in fatigue analysis and testing An advanced mechanical engineering design handbook focused on the needs of professional engineers within automotive, aerospace and related industrial disciplines
Book Synopsis S-N Fatigue Reliability Analysis of Highway Bridges by : P. Albrecht
Download or read book S-N Fatigue Reliability Analysis of Highway Bridges written by P. Albrecht and published by . This book was released on 1983 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents a method of calculating the expected fatigue failure probability of a structural detail, given the distribution of resistance and load. The resistance data, in terms of cycles to failure, come from previous laboratory tests. The load data come either from stress range histograms recorded on bridges or from loadmeter surveys. The proposed method replaces each histogram by an equivalent stress range and converts the latter into a distribution in terms of number of cycles. The problem is thus cast into the standard format for reliability analysis and allows one to calculate failure probabilities. Application of the method to designs in accordance with the AASHTO Specifications showed that fatigue failure probabilities for redundant load path (RLP) structures are inconsistent and vary greatly from PF = 9.2 x 10-2 for Category B to PF = 9.2 x 10-10 for Category E'. For nonredundant load path (NRLP) structures, they vary from PF = 5.1 x 10-2 for Category A to PF = 2.1 x 10-22 for Category E. It is proposed that the specifications be revised to include: (1) allowable stress ranges for RLP and NRLP structures with uniform failure probabilities; (2) explicit formulation of the specifications in terms of the actual number of single "fatigue trucks," each causing an equivalent stress range; and (3) continuous definition of allowable stress range versus truck traffic volume. An example illustrates the design of a bridge, not covered by the AASHTO specifications, to a specified failure probability.
Book Synopsis Analysis of the AASHTO Fatigue Design Provisions for Welded Steel Bridge Details Using Reliability Theory by : Benjamin Thomas Cross
Download or read book Analysis of the AASHTO Fatigue Design Provisions for Welded Steel Bridge Details Using Reliability Theory written by Benjamin Thomas Cross and published by . This book was released on 2007 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current fatigue design provisions in the AASHTO LRFD Specifications (2004) are based on an allowable stress approach. Provisions for most limit states, however, have been updated to the more modern reliability-based Load and Resistance Factor Design (LRFD) approach. The primary objective of the reported research was to assess the reliability present in the AASHTO fatigue design specifications for welded steel bridge details such that more uniform design provisions can eventually be implemented. To accomplish this, a reliability model was developed assuming a log-log straight line fatigue resistance model. The statistical parameters of the variables included in the model were determined based on sound engineering judgment and values used in similar past studies. The safety indices present in the current design provisions were then evaluated. The results indicate that the safety level of the current design provisions varies by span length and by detail category. Therefore, a target safety index was selected based on those currently present in design and new design fatigue resistance coefficients were proposed such that the safety level of the fatigue specifications would be uniform across all detail categories for a given set of design conditions. In addition, the safety of the design variable amplitude fatigue limits was evaluated through the use of computer simulations. New variable amplitude fatigue limits were then proposed to correspond with the proposed design fatigue resistance coefficients.
Book Synopsis Reliability Approach to Fatigue Design of Highway Bridges by : Anthony P. Pavia
Download or read book Reliability Approach to Fatigue Design of Highway Bridges written by Anthony P. Pavia and published by . This book was released on 1975 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Testing and Analysis by : Yung-Li Lee
Download or read book Fatigue Testing and Analysis written by Yung-Li Lee and published by Elsevier. This book was released on 2011-04-18 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue Testing and Analysis: Theory and Practice presents the latest, proven techniques for fatigue data acquisition, data analysis, and test planning and practice. More specifically, it covers the most comprehensive methods to capture the component load, to characterize the scatter of product fatigue resistance and loading, to perform the fatigue damage assessment of a product, and to develop an accelerated life test plan for reliability target demonstration. This book is most useful for test and design engineers in the ground vehicle industry. Fatigue Testing and Analysis introduces the methods to account for variability of loads and statistical fatigue properties that are useful for further probabilistic fatigue analysis. The text incorporates and demonstrates approaches that account for randomness of loading and materials, and covers the applications and demonstrations of both linear and double-linear damage rules. The reader will benefit from summaries of load transducer designs and data acquisition techniques, applications of both linear and non-linear damage rules and methods, and techniques to determine the statistical fatigue properties for the nominal stress-life and the local strain-life methods. Covers the useful techniques for component load measurement and data acquisition, fatigue properties determination, fatigue analysis, and accelerated life test criteria development, and, most importantly, test plans for reliability demonstrations Written from a practical point of view, based on the authors' industrial and academic experience in automotive engineering design Extensive practical examples are used to illustrate the main concepts in all chapters
Book Synopsis Fatigue and Fracture Reliability Engineering by : Jun Jiang Xiong
Download or read book Fatigue and Fracture Reliability Engineering written by Jun Jiang Xiong and published by Springer. This book was released on 2011-01-24 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue and Fracture Reliability Engineering is an attempt to present an integrated and unified approach to reliability determination of fatigue and fracture behaviour, incorporating probability, statistics and other related areas. A series of original and practical approaches, are suggested in Fatigue and Fracture Reliability Engineering, including new techniques in determining fatigue and fracture performances. It also carries out an investigation into static and fatigue properties, and into the failure mechanisms of unnotched and notched CFR composite laminates with different lay-ups to optimize the stacking sequence effect. Further benefits include: a novel convergence-divergence counting procedure to extract all load cycles from a load history of divergence-convergence waves; practical scatter factor formulae to determine the safe fatigue crack initiation and propagation lives from the results of a single full-scale test of a complete structure; and a nonlinear differential kinetic model for describing the dynamical behaviour of an atom at a fatigue crack tip. Fatigue and Fracture Reliability Engineering is intended for practising engineers in marine, civil construction, aerospace, offshore, automotive and chemical industries. It is also useful reading for researchers on doctoral programmes, and is appropriate for advanced undergraduate and postgraduate programmes in any mechanically-oriented engineering discipline.
Author :Anderson Cancer Center Texas Wei Zhang Publisher :LAP Lambert Academic Publishing ISBN 13 :9783659135385 Total Pages :156 pages Book Rating :4.1/5 (353 download)
Book Synopsis Fatigue Performance and Life-Cycle Prediction of Existing Bridges by : Anderson Cancer Center Texas Wei Zhang
Download or read book Fatigue Performance and Life-Cycle Prediction of Existing Bridges written by Anderson Cancer Center Texas Wei Zhang and published by LAP Lambert Academic Publishing. This book was released on 2012-05 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the life cycle of bridges, varied amplitude of stress ranges on structural details are induced by the random traffic and wind loads. The progressive deteriorated road surface conditions might accelerate the fatigue damage accumulations. Micro-cracks in structural details might be initiated. An effective structural modeling scheme and a reasonable fatigue damage accumulation rule are essential for stress range acquisitions and fatigue life estimation. The present research targets at the development of a fatigue life and reliability prediction methodology for existing steel bridges under real wind and traffic environment with the capability of including multiple random parameters and variables in bridges' life cycle.
Book Synopsis Fatigue Reliability of Steel Highway Bridge Details by : PJ. Massarelli
Download or read book Fatigue Reliability of Steel Highway Bridge Details written by PJ. Massarelli and published by . This book was released on 2001 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Data Handbook written by A. Buch and published by Trans Tech Publications Ltd. This book was released on 1998-03-17 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This authoritative handbook presents an extensive compilation of data covering all important fatigue situations - fatigue strength of steels and other materials, notch- , size-, and mean stress effects, influence of temperature and corrosion, influence of special surface treatments, fatigue of structural elements and welds, aircraft fatigue, multilevel loading test programs, fatigue performance prediction etc.As is well known, fatigue investigations are often extremely time-consuming. The results of the tests depend upon numerous factors, and therefore handbook data must include all of the parameters which affect reported test results. The calculation of fatigue life and strength cannot be performed without having appropriate information concerning the specific fatigue situation. Nor can test programs be properly prepared without knowing the service conditions and the results of previous tests as, otherwise, the results obtained cannot be generalized. Information on component fatigue behaviour is of importance not only to machine designers but also to production engineers in charge of component manufacture, since processing strongly affects fatigue strength, and to maintenance engineers in charge of the operation and repair of cyclically loaded machine elements.
Book Synopsis Handbook of Fatigue Testing by : S. Roy Swanson
Download or read book Handbook of Fatigue Testing written by S. Roy Swanson and published by ASTM International. This book was released on 1974 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
