Optimal and acceptable reliabilities for structural design

Fischer, Katharina; Viljoen, Celeste; Köhler, Jochen; Faber, Michael Havbro

doi:10.1016/j.strusafe.2018.09.002

Cited by 49 publications

(28 citation statements)

References 9 publications

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“…Baravalle and Köhler [84] considered annual reference period as a basis for the reliability analysis and optimization [76,81] and obtained 1.6 < γ W < 1.8.…”

Section: Discussion 61 Comparison With Other Studiesmentioning

confidence: 99%

“…Comparisons with current satisfactory design practice [72]; b. Human safety criteria [7,59]; c. Economic optimization focused on life-cycle costs of representative structures -for instance buildings [4,5], bridges [73,74], or tunnels [75] or a series of structures under systematic replacements over a long period [76,81]. EN 1990 [1] recommends the target reliability index β for the two reference periods -1 and 50 years; see example for medium consequences of failure in Table 1.…”

Section: Target Reliabilitymentioning

confidence: 99%

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Calibrating Partial Factors – Methodology, Input Data and Case Study of Steel Structures

Nadolski

Rózsás

Sýkora

2019

Period. Polytech. Civil Eng.

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Partial factors are commonly based on expert judgements and on calibration to previous design formats. This inevitably results in unbalanced structural reliability for different types of construction materials, loads and limit states. Probabilistic calibration makes it possible to account for plentiful requirements on structural performance, environmental conditions, production and execution quality etc. In the light of ongoing revisions of Eurocodes and the development of National Annexes, the study overviews the methodology of probabilistic calibration, provides input data for models of basic variables and illustrates the application by a case study. It appears that the partial factors recommended in the current standards provide for a lower reliability level than that indicated in EN 1990. Different values should be considered for the partial factors for imposed, wind and snow loads, appreciating the distinct nature of uncertainties in their load effects.

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“…Baravalle and Köhler [84] considered annual reference period as a basis for the reliability analysis and optimization [76,81] and obtained 1.6 < γ W < 1.8.…”

Section: Discussion 61 Comparison With Other Studiesmentioning

confidence: 99%

Section: Target Reliabilitymentioning

confidence: 99%

Calibrating Partial Factors – Methodology, Input Data and Case Study of Steel Structures

Nadolski

Rózsás

Sýkora

2019

Period. Polytech. Civil Eng.

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“…To Pay (SWTP) corresponding to the amount of money which should be invested into saving one additional life. In Fischer et al (2012) and Fischer et al (2019) the LQI acceptance criterion is defined in terms of the acceptable reliability level:…”

Section: Marginal Costs Of Safety Measuresmentioning

confidence: 99%

Target reliability indices for existing quay walls derived on the basis of economic optimisation and human safety requirements

Roubos

Allaix

Fischer³

et al. 2019

Structure and Infrastructure Engineering

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Target reliability indices for existing quay walls derived on the basis of economic optimisation and human safety requirements General frameworks for reliability differentiation have evolved over time and are mainly developed for buildings. However, recommendations for the safety of existing quay walls are lacking. In this study, target reliability indices for assessing existing quay walls were derived by economic optimisation and by evaluating the requirements concerning human safety. In quay-wall design, some dominant stochastic design variables are largely time-independent, such as soil and material properties. The influence of time-independent variables on the evolution of the probability of failure was taken into consideration, since this affects the present value of future failure costs and the associated target reliability indices. The target reliability indices obtained for existing quay walls depend on the consequences of failure and the remaining lifetime. If the failure modes of a quay wall are governed by time-independent design parameters and the quay wall has already survived the early service period, the residual probability of failure is lower for an existing quay wall compared to a new structure. Hence, this should be considered in the determination of target reliability indices. The method to evaluate quay-wall reliability over time can also be used to assess other civil and geotechnical structures.

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“…For example, in the case of large consequences ρ ranges between 5 and 10. Further discussion can be found in [15]; it is noted that higher ρ-values are realistic in case of member failure as discussed in Section 4.1. b) In case of structures with extreme failure consequences i.e. ρ > 10 the target values shall be defined based on risk-benefit studies.…”

Section: Jcss Recommendations [6] [13]mentioning

confidence: 99%

“…This requirement can be implemented by considering the system behaviour of the structure (indirectly through the failure consequences) in the selection of an appropriate target member safety level. Finally, an interesting discussion of the consequence ratio is presented in [15] where ρ is derived as the ratio between the total consequences i.e. direct (member failure) and indirect (system failure given member failure) and the direct consequences.…”

Section: Jcss Recommendations [6] [13]mentioning

confidence: 99%

Reliability differentiation and uniform risk in standards: a critical review and a practical appraisal

Diamantidis¹,

Sýkora²

2019

Future Trends in Civil Engineering

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Reliability of structures and infrastructures is a major issue in structural engineering. Structural standards have traditionally been mainly concerned with public safety preventing loss of life or injury; this view has been shifting in recent years towards minimisation of economic loss. This contribution discusses the reliability differentiation principle in modern standards. Its aim is to achieve uniform risk levels for the various classes of structures. Codified criteria for reliability differentiation and risk informed decisions inherent in standards and especially in the Eurocodes are critically reviewed. It is shown that the classification of structures based on consequences of failure is an approach that has not been widely implemented in everyday design. Practical rules for the classification and implementation in design are needed and related proposals are presented.

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Optimal and acceptable reliabilities for structural design

Cited by 49 publications

References 9 publications

Calibrating Partial Factors – Methodology, Input Data and Case Study of Steel Structures

Calibrating Partial Factors – Methodology, Input Data and Case Study of Steel Structures

Target reliability indices for existing quay walls derived on the basis of economic optimisation and human safety requirements

Reliability differentiation and uniform risk in standards: a critical review and a practical appraisal

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