S N Fatigue Reliability Analysis Of Highway Bridges
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| Author | : P. Albrecht |
| Publisher | : |
| Total Pages | : 21 |
| Release | : 1983 |
| Genre | : Bridges |
| ISBN | : |
Download S-N Fatigue Reliability Analysis of Highway Bridges Book in PDF, Epub and Kindle
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.
| Author | : Androula Y. Michael |
| Publisher | : |
| Total Pages | : 556 |
| Release | : 1989 |
| Genre | : |
| ISBN | : |
Download Fatigue Reliability and Fracture Behavior of Highway Steel Bridges Book in PDF, Epub and Kindle
| Author | : Naiwei Lu |
| Publisher | : Momentum Press |
| Total Pages | : 231 |
| Release | : 2018-05-08 |
| Genre | : Technology & Engineering |
| ISBN | : 1947083392 |
Download Multi-Scale Reliability and Serviceability Assessment of In-Service Long-Span Bridges Book in PDF, Epub and Kindle
With the development in global economic and transportation engineering, the traffic loads on brides have been growing steadily, which become potential safety hazards for existing bridges. In particular, long-span suspension bridges support heavy traffic volumes and simultaneous truck loads on the bridge deck, and thus the safety and serviceability of the bridge deserves investigation. In this book, a multiscale reliability method is presented for the safety assessment of long-span bridges. The multiscale failure condition of stiffness girders is the first-passage criteria for the large-scale model and the fatigue damage criteria for the small-scale model. It is the objective of this book to provide a more in-depth understanding of the vehicle-bridge interaction from the random vibration perspective. This book is suitable for adoption as a text book or a reference book in an advanced structural reliability analysis course. Furthermore, this book also provides a theoretical foundation for better understanding of the safety assessment, operation management, maintenance and reinforcement for long-span bridges and motivates further research and development for more advanced reliability and serviceability assessment techniques for long-span bridges.
| Author | : J. M. Bloom |
| Publisher | : ASTM International |
| Total Pages | : 228 |
| Release | : 1983 |
| Genre | : Technology & Engineering |
| ISBN | : 9780803102422 |
Download Probabilistic Fracture Mechanics and Fatigue Methods Book in PDF, Epub and Kindle
| Author | : Stephen J. Ressler |
| Publisher | : |
| Total Pages | : 263 |
| Release | : 1992 |
| Genre | : Bridges |
| ISBN | : |
Download Fatigue Reliability and Redundancy in Two-girder Steel Highway Bridges Book in PDF, Epub and Kindle
| Author | : Peter J. Massarelli |
| Publisher | : |
| Total Pages | : 40 |
| Release | : 2001 |
| Genre | : Iron and steel bridges |
| ISBN | : |
Download Fatigue Reliability of Steel Highway Bridge Details Book in PDF, Epub and Kindle
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.
| Author | : |
| Publisher | : ASTM International |
| Total Pages | : 222 |
| Release | : |
| Genre | : |
| ISBN | : |
Download Probabilistic Frature Mechanics and Fatigue Methods: Applications for Structural Design and Maintenance Book in PDF, Epub and Kindle
| Author | : Robert J. Conner |
| Publisher | : Transportation Research Board |
| Total Pages | : 84 |
| Release | : 2005 |
| Genre | : Technology & Engineering |
| ISBN | : 0309097614 |
Download Inspection and Management of Bridges with Fracture-critical Details Book in PDF, Epub and Kindle
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 354: Inspection and Management of Bridges with Fracture-Critical Details explores the inspection and maintenance of bridges with fracture-critical members (FCMs), as defined in the American Association of State Highway and Transportation Officials' Load and Resistance Factor Design (LRFD) Bridge Design Specifications. The report identifies gaps in literature related to the subject; determines practices and problems with how bridge owners define, identify, document, inspect, and manage bridges with fracture-critical details; and identifies specific research needs. Among the areas examined in the report are inspection frequencies and procedures; methods for calculating remaining fatigue life; qualification, availability, and training of inspectors; cost of inspection programs; instances where inspection programs prevented failures; retrofit techniques; fabrication methods and inspections; and experience with fracture-critical members fractures and problems details.
| Author | : Christian Lalanne |
| Publisher | : John Wiley & Sons |
| Total Pages | : 517 |
| Release | : 2010-01-05 |
| Genre | : Technology & Engineering |
| ISBN | : 0470610360 |
Download Mechanical Vibration and Shock Analysis, Specification Development Book in PDF, Epub and Kindle
Mechanical Vibration and Shock Analysis, Second Edition Volume 5: Specification Development This volume focuses on specification development in accordance with the principle of tailoring. Extreme response and the fatigue damage spectra are defined for each type of stress (sinusoidal vibration, swept sine, shock, random vibration, etc.). The process for establishing a specification from the life cycle profile of the equipment which will be subject to these types of stresses is then detailed. The analysis takes account of the uncertainty factor, designed to cover uncertainties related to the real-world environment and mechanical strength, and the test factor, which takes account of the number of tests performed to demonstrate the resistance of the equipment. The Mechanical Vibration and Shock Analysis five-volume series has been written with both the professional engineer and the academic in mind. Christian Lalanne explores every aspect of vibration and shock, two fundamental and extremely significant areas of mechanical engineering, from both a theoretical and practical point of view. The five volumes cover all the necessary issues in this area of mechanical engineering. The theoretical analyses are placed in the context of both the real world and the laboratory, which is essential for the development of specifications.
| Author | : Ahmed Mostafa Tawfik Farag |
| Publisher | : |
| Total Pages | : 231 |
| Release | : 2015 |
| Genre | : Iron and steel bridges |
| ISBN | : |
Download Calibration of Fatigue Design Factors and Fatigue Life Reliability of Steel Highway Bridges Using WIM Databases Book in PDF, Epub and Kindle
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.
