Redundancy and robustness of highway bridge superstructures and substructures

Ghosn, Michel; Moses, Fred; Frangopol, Dan M.

doi:10.1080/15732470802664498

Cited by 80 publications

(56 citation statements)

References 8 publications

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“…The current AASHTO LRFD bridge design specifications (2007), however, do not provide any provisions or guidance regarding the displacement limit (based on the ultimate load capacity of a bridge) that can be utilized for a redundancy evaluation. Ghosn et al (1998) proposed a displacement limit caused by live load as one percent of the span length based on engineering judgment, and they defined the displacement limit as a "functionality limit state". If the functionality limit state is utilized as the displacement limit for the redundancy evaluation of a twin steel box-girder bridge, some of the investigated bridges would not satisfy this requirement.…”

Section: Dynamic Displacement Responsementioning

confidence: 99%

“…If the functionality limit state is utilized as the displacement limit for the redundancy evaluation of a twin steel box-girder bridge, some of the investigated bridges would not satisfy this requirement. For the judgment of the displacement limit, however, Ghosn et al (1998) used a somewhat ambiguous definition based on "the maximum visible displacement that a bridge user or an observer can tolerate". The assumed damage and loading level in this study was intended to simulate the worst-case loading with very severe damage; thus, the possibility of occurrence would be rare.…”

Section: Dynamic Displacement Responsementioning

confidence: 99%

“…There are three main conditions that should be specified to systematically evaluate the redundancy of a bridge system (Ghosn et al, 1998): damage scenario, load case, and target limit state. In this study, a considered damage scenario was the sudden fracture (intended to simulate brittle fracture) of one girder in a twin steel box-girder bridge.…”

Section: Introductionmentioning

confidence: 99%

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Finite-Element Modeling of Twin Steel Box-Girder Bridges for Redundancy Evaluation

Kim

Williamson

2015

J. Bridge Eng.

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Section: Dynamic Displacement Responsementioning

confidence: 99%

Section: Dynamic Displacement Responsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Finite-Element Modeling of Twin Steel Box-Girder Bridges for Redundancy Evaluation

Kim

Williamson

2015

J. Bridge Eng.

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“…This is not limited to buildings, but it is a major concern also for bridges (Starossek 2008). Therefore, new design concepts and methods are needed to ensure safety, redundancy and robustness of buildings and bridges against the occurrence of exceptional damaging events (Ghosn et al 2010, Okasha and Frangopol 2010a, Zhu and Frangopol 2012, 2013, 2015, Frangopol and Saydam 2014. In addition, damage involving disproportionate effects could also arise continuously in time, due to aging and deterioration processes (Frangopol and Curley 1987, Biondini 2009, Okasha and Frangopol 2010b, Decò et al 2011, Biondini and Frangopol 2014a, 2014b.…”

Section: Introductionmentioning

confidence: 99%

Life-cycle robustness of deteriorating concrete structures

Biondini¹,

Frangopol²

2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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The life-cycle structural robustness is generally investigated with respect to the initial time of construction, when the structure is intact. However, in the evaluation of life-cycle robustness of existing structures it may be of interest to evaluate the impact of deterioration on the structural performance with reference to the actual damage state and performance level existing at the time of inspection and/or assessment. In this paper, a robustness criterion presented in previous works is extended to consider the influence of the damage level on the time-variant robustness of existing concrete structures over the remaining structural lifetime. In addition, the role of the importance of the structure in the assessment of the life-cycle robustness is considered. The effectiveness of the proposed approach is shown through the application to the deterministic and probabilistic assessment of the life-cycle robustness of a reinforced concrete pier of an existing bridge.

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“…As specified in the NCHRP Report 406 (Ghosn and Moses 1997), the bridge redundancy is the capability of the bridge superstructure to continue to perform its design functions after the damage or failure of one of its structural members. In order to assess whether or not a given bridge superstructure has adequate level of system redundancy and safety, the system reserve capacity shall also be evaluated at the functionality and damaged limit states (Ghosn and Moses 1997).…”

Section: Nominal Design Capacity -Aashto Lrfdmentioning

confidence: 99%

Performance Evaluation of Damage-Integrated Composite Steel Girder Highway Bridges

Gheitasi

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AcknowledgementFirst and foremost, I would like to express my most sincere thanks and appreciation to Dr. Devin K. Harris for his years of advice on this dissertation and his continuous support during my time at Michigan Tech. and University of Virginia. More than all the scientific knowledge and experience with regards to my research, you have helped me tremendously with the career pursuit and at the same time allowed me to flourish on my own. All the classroom experiences I have gained during these four years would have not been possible without your trust and help. I will be forever grateful for your guidance and wisdom, which I believe will continue to prove invaluable to me throughout my future career.My dissertation committee, Dr. Theresa M. Ahlborn, Dr. Thomas T. Baber, Dr. Osman E.Ozbulut, and Dr. John R. Scully, your guidance, assistant, and time are much appreciated. Your experience and insight have given me the opportunity to visualize concepts from different perspectives which I believe helped me significantly to improve the research work done.I would also like to express my appreciation to my research sponsor; Mid-Atlantic Universities Transportation Centers (MAUTC) for providing support and interest for this project. I am also thankful to the Department of Civil and Environmental Engineering at theUniversity of Virginia for their financial support that enabled me to attend several national conferences and annual meetings during my PhD, and for the unique opportunity to teach my own class on "Bridge Engineering and Design". I would also like to thank Dr. Brown, Dr. Chase, Dr. Kassner for providing structural details and plans of the selected in-service structures within the Commonwealth of Virginia; and Mr.Prasad Nallapaneni from Virginia Department of Transportation (VDOT) for his help on providing details on the selected damage scenarios. AbstractThe safety and condition of transportation infrastructure has been at the forefront of national debates in recent times due to the catastrophic bridge failures occurred in the United States, but the issue has been a longstanding challenge for transportation agencies for many years as resources continue to diminish. The performance of this infrastructure has a direct influence on the lives of most of citizens in developed regions by providing a critical lifeline between communities and the transportation of goods and services, and as a critical component of the transportation network, bridges have received a lot of attention regarding condition assessment and maintenance practices. To date, several inspection methods and monitoring techniques have been developed and used by the bridge owners to monitor the in-service behavior and detect different sourced of damage and deterioration in bridge structures. Despite successful implementation of these methods, what is still lacking is a fundamental understanding of the system behavior in the presence of deteriorating conditions that can be used to estimate the remaining service life of the structure and facilit...

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Redundancy and robustness of highway bridge superstructures and substructures

Cited by 80 publications

References 8 publications

Finite-Element Modeling of Twin Steel Box-Girder Bridges for Redundancy Evaluation

Finite-Element Modeling of Twin Steel Box-Girder Bridges for Redundancy Evaluation

Life-cycle robustness of deteriorating concrete structures

Performance Evaluation of Damage-Integrated Composite Steel Girder Highway Bridges

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