On the assessment of robustness

Baker, Jack W.; Schubert, Matthias; Faber, Michael Havbro

doi:10.1016/j.strusafe.2006.11.004

Cited by 281 publications

(143 citation statements)

References 15 publications

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“…In the first approach, measures of structural robustness are derived from probabilistic risk assessments . Baker et al (2008) defined a measure for quantifying structural robustness as a function of direct and indirect risk. Although this approach is very powerful, the complexity and subjectiveness in the quantification of the direct and indirect risk in large structural systems hinders the application of this approach.…”

Section: Introductionmentioning

confidence: 99%

Application of Reliability-Based Robustness Assessment of Steel Moment Resisting Frame Structures under Post-Mainshock Cascading Events

2014

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This paper proposes a reliability-based framework for quantifying structural robustness considering the occurrence of a major earthquake (mainshock) and subsequent cascading hazard events, such as aftershocks that are triggered by the mainshock. These events can significantly increase the probability of failure of buildings, especially for structures that are damaged during the mainshock. The application of the proposed framework is exemplified through three numerical case studies. The case studies correspond to three SAC steel moment frame buildings of three, nine, and 20 stories, which were designed to pre-Northridge codes and standards. Two-dimensional nonlinear finiteelement models of the buildings are developed with the Open System for Earthquake Engineering Simulation framework (OpenSees), using a finite length plastic hinge beam model and a bilinear constitutive law with deterioration, and are subjected to multiple mainshock-aftershock seismic sequences. For the three buildings analyzed herein, it is shown that the structural reliability under a single seismic event can be significantly different from that under a sequence of seismic events. The reliability based robustness indicator shows that the structural robustness is influenced by the extent to which a structure can distribute damage.

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Section: Introductionmentioning

confidence: 99%

Application of Reliability-Based Robustness Assessment of Steel Moment Resisting Frame Structures under Post-Mainshock Cascading Events

2014

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“…The analysis of the failure progression can be facilitated by topological considerations (Agarwal et al, 2003) or by energy-based approaches (Smith, 2006;Starossek, 2009;Haberland, 2007). Quantification of risk is another possibility (Baker et al, 2008).…”

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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“…The easiness of triggering damage in a system is referred to in the following as structural vulnerability, according to the definitions given in Baker et al (2008) and used in Augusti et al (2001) and Giuliani (2009). Even if strictly related to structural choices, the vulnerability of a structure is also dependant on the characteristic of the action (entity, direction, application, possible dynamic properties) and it is not a property of the structural system alone.…”

Section: Aims Of Safety Design Strategiesmentioning

confidence: 99%

“…Nevertheless, some conceptual differences can be found in literature on the definition of the term. In particular, the robust response is either referred to the accidental action (Baker et al, 2008;EN 1991EN -1-7, 2006NTC, 2008) or to the initial failure (SEI PC, 2006;Starossek, 2008;DS-INF 146, 2003).…”

Section: Evaluation Of Structural Robustnessmentioning

confidence: 99%

“…• Risk-based: this approach (Baker et al, 2008) is based on the investigations of some risk scenarios, determined on the basis of an event tree. To this aim, the assessment of the probability of occurrence of each leaf of the tree is required and an evaluation of the consequence in term of costs is needed in order to calculate the associated risk.…”

Section: Definition Of Robustnessmentioning

confidence: 99%

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Structural safety in case of extreme actions

Giuliani

2012

IJLCPE

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Abstract:The behaviour of buildings and other constructions under critical events is widely recognised to be an important part of structural design. Still, the problem is often addressed in a qualitative way by many current codes and regulations and designers cannot refer to specific methodologies for the assessment or the achievement of the structural integrity of constructions. The term structural integrity is intended here as the ability of a construction to sustain extreme actions, which directly affect the structural system, without developing a major collapse.In this paper, two main methods are outlined for the achievement of structural integrity: a bottom-up approach, where the effects of element failures are investigated, disregarding the modelling of the specific action that could have triggered them; and a top-down approach, where the response of the structure to a particular accidental action is sought.The use of the first approach is proposed for assessing, by means of a set of non-linear static analyses, the robustness of structural systems, intended as the ability of a structure to sustain local failures (Starossek, 2009) without developing a major collapse.

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On the assessment of robustness

Cited by 281 publications

References 15 publications

Application of Reliability-Based Robustness Assessment of Steel Moment Resisting Frame Structures under Post-Mainshock Cascading Events

Application of Reliability-Based Robustness Assessment of Steel Moment Resisting Frame Structures under Post-Mainshock Cascading Events

Robustness of structures

Structural safety in case of extreme actions

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