Management of bridges with shallow foundations exposed to local scour

Tanasić, Nikola; Hajdin, Rade

doi:10.1080/15732479.2017.1406960

Cited by 21 publications

(10 citation statements)

References 11 publications

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“…The risk of failure of a bridge due to scour should consider the flood hazard (describing the probability of occurrence of flood events with different intensities) as well as the bridge vulnerability, i.e., the probability of failure P f (z) conditional to an event of a given scour level z. Studies on scour vulnerability of bridges are rather scarce (see [168,[174][175][176][177][178]), and most of them employ a deterministic approach, resulting in a single value of the critical scour depth corresponding to bridge collapse. However, many uncertainties are affecting the bridge response that must be taken into account, including those inherent to the bridge geometry, material properties, and foundation depth, which are often unknown.…”

Section: Research Needs and Future Directionsmentioning

confidence: 99%

The Science behind Scour at Bridge Foundations: A Review

Pizarro

Manfreda

Tubaldi

2020

Water

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Foundation scour is among the main causes of bridge collapse worldwide, resulting in significant direct and indirect losses. A vast amount of research has been carried out during the last decades on the physics and modelling of this phenomenon. The purpose of this paper is, therefore, to provide an up-to-date, comprehensive, and holistic literature review of the problem of scour at bridge foundations, with a focus on the following topics: (i) sediment particle motion; (ii) physical modelling and controlling dimensionless scour parameters; (iii) scour estimates encompassing empirical models, numerical frameworks, data-driven methods, and non-deterministic approaches; (iv) bridge scour monitoring including successful examples of case studies; (v) current approach for assessment and design of bridges against scour; and, (vi) research needs and future avenues.

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Section: Research Needs and Future Directionsmentioning

confidence: 99%

The Science behind Scour at Bridge Foundations: A Review

Pizarro

Manfreda

Tubaldi

2020

Water

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“…However, in this way, the effect of scour geometry and the modification of the soil properties due to saturation and scour is not considered. Tanasic et al (2013) and Tanasic and Hajdin (2017) estimated the bridge damage probability considering the degradation of soil parameters over time due to scouring using a simplified approach. Bridge failure is the result of either geotechnical or structural failure mechanisms, with the first being the excessive settlement and the second being the failure of the deck (ultimate capacity).…”

Section: Modelling Of Multiple Hazards and Cascading Effectsmentioning

confidence: 99%

Fragility of transport assets exposed to multiple hazards: State-of-the-art review toward infrastructural resilience

Argyroudis

Mitoulis

Winter

et al. 2019

Reliability Engineering & System Safety

176

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Vulnerability is a fundamental component of risk and its understanding is important for characterising the reliability of infrastructure assets and systems and for mitigating risks. The vulnerability analysis of infrastructure exposed to natural hazards has become a key area of research due to the critical role that infrastructure plays for society and this topic has been the subject of significant advances from new data and insights following recent disasters. Transport systems, in particular, are highly vulnerable to natural hazards, and the physical damage of transport assets may cause significant disruption and socioeconomic impact. More importantly, infrastructure assets comprise Systems of Assets (SoA), i.e. a combination of interdependent assets exposed not to one, but to multiple hazards, depending on the environment within which these reside. Thus, it is of paramount importance for their reliability and safety to enable fragility analysis of SoA subjected to a sequence of hazards. In this context, and after understanding the absence of a relevant study, the aim of this paper is to review the recent advances on fragility assessment of critical transport infrastructure subject to diverse geotechnical and climatic hazards. The effects of these hazards on the main transport assets are summarised and common damage modes are described. Frequently in practice, individual fragility functions for each transport asset are employed as part of a quantitative risk analysis (QRA) of the infrastructure. A comprehensive review of the available fragility functions is provided for different hazards. Engineering advances in the development of numerical fragility functions for individual assets are discussed including soilstructure interaction, deterioration, and multiple hazard effects. The concept of SoA in diverse ecosystems is introduced, where infrastructure is classified based on (i) the road capacity and speed limits and (ii) the geomorphological and topographical conditions. A methodological framework for the development of numerical fragility functions of SoA under multiple hazards is proposed and demonstrated. The paper concludes by detailing the opportunities for future developments in the fragility analysis of transport SoA under multiple hazards, which is of paramount importance in decision-making processes around adaptation, mitigation, and recovery planning in respect of geotechnical and climatic hazards.

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“…Furthermore, there are available guidelines for the design and assessment of bridges exposed to hydraulic (SDF) actions [7]. However, very little research is available on quantitative risk and vulnerability assessment of bridges exposed to SDF [4] [8], whilst no research is available for assessing the resilience of flood-critical bridges, even though it is widely recognised that Quantitative Risk Analysis (QRA) is important, especially for the resilience and adaptability of critical assets [9][10]. This is a capability gap that needs filling with new and reliable fragility and restoration functions which can reflect realistically, the rapidity of the recovery and the reinstatement actions required throughout the post-disaster management actions [11].…”

Section: Introductionmentioning

confidence: 99%

Risk and resilience of bridgeworks exposed to hydraulic hazards

Mitoulis

Argyroudis

Lamb³

2019

IABSE Congress, New York, New York 2019: The Evolving Metropolis

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<p>Transportation infrastructure is a pylon for the society and economy, enabling the services and transportation of goods, under normal and emergency circumstances. Bridgeworks act as bottlenecks within road and rail networks and their failures due to e.g. floods, cause disproportionate losses, which are expected to be exacerbated due to climate change. Thus, pinpointing the vulnerabilities and quantifying the resilience of bridges within transportation networks exposed to hydraulic hazards is of paramount importance. However, reliable quantification of risk and resilience of flood-critical bridges is not yet available, as there is a lot of engineering guesswork for qualitative assessments. This paper describes a new integrated framework for the resilience assessment of bridgeworks and networks subjected to hydraulic hazards such as scour, debris flow and hydraulic actions. An overview of the critical hydraulic hazards, and the evaluation of their intensity measures based on regional and site-specific approaches is provided in the paper. The framework also includes vulnerability models for bridges for the evaluation of direct losses, i.e. physical damage, as a means to deliver the quantitative risk assessment (QRA) of the exposed bridgeworks and networks. The second component of the resilience framework is the restoration and reinstatement models, which are expressed by practical restoration times and tasks. Toward this end, this paper summarises an on-going comprehensive survey, which aims to elicit knowledge from experts, in an effort to develop restoration models for bridges exposed to floods. The framework is a useful tool for allocating the resources reasonably toward efficient management and consequence analysis on a network level.</p>

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Management of bridges with shallow foundations exposed to local scour

Cited by 21 publications

References 11 publications

The Science behind Scour at Bridge Foundations: A Review

The Science behind Scour at Bridge Foundations: A Review

Fragility of transport assets exposed to multiple hazards: State-of-the-art review toward infrastructural resilience

Risk and resilience of bridgeworks exposed to hydraulic hazards

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