Load Capacity Evaluation of Existing Railway Bridges based on Robustness Quantification

Wiśniewski, Dawid; Casas, Joan R.; Ghosn, Michel

doi:10.2749/101686606777962440

Cited by 27 publications

(15 citation statements)

References 1 publication

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“…The works of Callaway et al (2000), Agarwal et al (2006), Wisniewski et al (2006), Starossek and Haberland (2008), Baker et al (2008) and Eurocode 1 (CEN 2002) give a wide range of structural robustness definitions. Key concepts are shared by these definitions, which can be summarized by: event, causes, damage, environment, structural performance or function and consequences.…”

Section: Background On Structural Robustness Definitionmentioning

confidence: 99%

Robustness of corroded reinforced concrete structures – a structural performance approach

Cavaco

Casas

Neves

et al. 2010

Structure and Infrastructure Engineering

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The aim of this work is to provide new contributions in order to define more accurately the structural robustness concept, particularly when applied to corroded reinforced concrete (RC) structures. To fulfill such task, several robustness indicators are analyzed and discussed with special emphasis on structural performance based measures. A new robustness definition and a framework to assess it are then proposed, based on the structural performance lost after damage occurrence. The competence of the proposed methodology is then tested comparing the robustness of two reinforced concrete foot bridges under corrosion. The damage considered is the longitudinal reinforcement corrosion level and load carrying capacity is the structural performance evaluated. In order to analyze corrosion effects, a finite element based on a two step analysis is adopted. In the first step a cross section analysis is performed to capture phenomenons such as expansion of the reinforcement due to the corrosion products accumulation; damage and cracking in the reinforcement surrounding concrete; steel-concrete bond strength degradation; and effective reinforcement area reduction. The results obtained are then used to build a 2D structural model, in order to assess the maximum load carrying capacity of the corroded structure. For each foot bridge, robustness is assessed using the proposed methodology.

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Section: Background On Structural Robustness Definitionmentioning

confidence: 99%

Robustness of corroded reinforced concrete structures – a structural performance approach

Cavaco

Casas

Neves

et al. 2010

Structure and Infrastructure Engineering

Self Cite

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“…From the referred works, and having in mind the presented fundamental concepts several times used to define robustness it is understandable that some authors (Wisniewski et al 2006;Starossek 2008) consider that a structure is robust if the relationship between the initial damage and the degree of structural performance is acceptable. On the other hand, remaining referred authors define an unrobust structure when there is a disproportionate relationship between the trigger event and the consequences resulting from it.…”

Section: Definitionmentioning

confidence: 99%

“…Several works (Callaway et al 2000;Agarwal et al 2006;Wisniewski et al 2006;Starossek 2008;Baker et al 2008) made interesting attempts to define it.…”

Section: Definitionmentioning

confidence: 99%

A framework for robustness assessment in the context of corroded RC structures

Cavaco¹,

Casas²,

Neves³

et al. 2010

Bridge Maintenance, Safety, Management and Life-Cycle Optimization

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Structural robustness is an emergent concept related to the structural response to damage. At the present time, robustness is not well defined and much controversy still remains around this subject. Even if robustness has seen growing interest as a consequence of catastrophic consequences due to extreme events, the fact is that the concept can also be very useful when considered on more probable exposure scenarios such as deterioration, among others. This paper intends to be a contribution to the definition of structural robustness, especially in the analysis of reinforced concrete structures subjected to corrosion. To achieve this, first of all, several proposed robustness definitions and indicators and misunderstood concepts will be analyzed and compared. From this point and regarding a concept that could be applied to most type of structures and damage scenarios, a robustness definition is proposed. To illustrate the proposed concept, an example of corroded reinforced concrete structures will be analyzed using nonlinear analysis numerical methods based on a continuum strong discontinuities approach and isotropic damage models for concrete. Finally the robustness of the presented example will be assessed.

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“…When the properties of damaged and undamaged structures are compared, the comparison can be based on the respective system load-carrying capacity (Harte et al, 2007;Maes et al, 2006;Wisniewski et al, 2006), system stiffness (Haberland, 2007;Starossek, 2009), or probability of failure (Lind, 1995;Maes et al, 2006). When the response of the structure to initial damage is examined, the resulting extent of failure progression can be quantified (Haberland, 2007;Starossek, 2009).…”

Section: Measures Of Robustnessmentioning

confidence: 99%

Robustness of structures

Starossek

Haberland

2012

IJLCPE

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Disproportionate collapse is prevented by ensuring collapse resistance, a property defined as the insensitivity of a structure to abnormal events. Enhancing robustness and reducing vulnerability are two different structural measures for achieving collapse resistance. The vulnerability of a structure is its susceptibility to become initially damaged by abnormal events; robustness is its insensitivity to such initial damage. Another option for preventing disproportionate collapse is the reduction of the exposure of the structure to abnormal events. The design strategy reducing vulnerability aims at preventing failure initiation whereas the strategy enhancing robustness aims at preventing disproportionate failure spreading. These two approaches are compared. Robustness can be achieved by the design methods alternative load paths and segmentation, which are also discussed. Furthermore, measures for the quantification of robustness are discussed.

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Load Capacity Evaluation of Existing Railway Bridges based on Robustness Quantification

Cited by 27 publications

References 1 publication

Robustness of corroded reinforced concrete structures – a structural performance approach

Robustness of corroded reinforced concrete structures – a structural performance approach

A framework for robustness assessment in the context of corroded RC structures

Robustness of structures

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