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Permanent link (DOI): https://doi.org/10.7939/R3RQ32

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Calibration of Fatigue Design Factors and Fatigue Life Reliability of Steel Highway Bridges Using WIM Databases Open Access

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Other title
Subject/Keyword
reliability analysis
steel highway bridges
fatigue crack initiation
fatigue crack propagation
steel details
bridge truck loading
Fatigue life improvement
weld toe grinding
uncertainties in weld size
linear elastic fracture mechanics
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Farag, Ahmed Mostafa Tawfik
Supervisor and department
Adeeb, Samer (Civil and Environmental Engineering)
Examining committee member and department
Hong, Han-Ping (Civil and Environmental Engineering - Western University)
Gul, Mustafa (Civil and Environmental Engineering)
Adeeb, Samer (Civil and Environmental Engineering)
Szymanski, Jozef (Civil and Environmental Engineering)
Cheng, Roger (Civil and Environmental Engineering)
El-Rich, Marwan (Civil and Environmental Engineering)
Department
Department of Civil and Environmental Engineering
Specialization
Structural Engineering
Date accepted
2015-02-02T14:46:45Z
Graduation date
2015-06
Degree
Doctor of Philosophy
Degree level
Doctoral
Abstract
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.
Language
English
DOI
doi:10.7939/R3RQ32
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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