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8/11/2019 En 1990 Basis of Structural Design - Annex B Reliability Differentiation Annex C Reliability Theory
1/31
Brussels, 18-20 February 2008 Dissemination of information workshop 1
EUROCODESBackground and Applications
Ton Vrouwenvelder
TNO / TU Delft
EN1990
Basis of Structural Design
Annex B Reliability DifferentiationAnnex C Reliability Theory
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8/11/2019 En 1990 Basis of Structural Design - Annex B Reliability Differentiation Annex C Reliability Theory
2/31
Brussels, 18-20 February 2008 Dissemination of information workshop 2
EUROCODESBackground and Applications
- randomness - natural variability
- statistical uncertainties - lack of data
- model uncertainties - simplified models- vagueness - imprecision in definitions
- gross errors - human factors
- ignorance - lack of knowledge
Density Plot (Shifted Lognormal) - [ A1_792]
210 220 230 240 250 260 270 280 290 300 310 320 330 340 350 360 370 380 390 400 410 420
0.000
0.005
0.010
0.015
0.020
Relative frequency
Yield strength [MPa]
Design =
decision making
under uncertainty
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8/11/2019 En 1990 Basis of Structural Design - Annex B Reliability Differentiation Annex C Reliability Theory
3/31
Brussels, 18-20 February 2008 Dissemination of information workshop 3
EUROCODESBackground and Applications
To get a grip:
Mechanical models Statistical models
Engineering judgement
Robustness Quality Control
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8/11/2019 En 1990 Basis of Structural Design - Annex B Reliability Differentiation Annex C Reliability Theory
4/31
Brussels, 18-20 February 2008 Dissemination of information workshop 4
EUROCODESBackground and Applications
EN 1990: Annexes B / C (Informatieve)
Consequences classes
Differentiation of beta values and partial factors
Background for Partial Factor design
Background for Probabilistic design
EN 1990 Main Text:
3.5 (5) As an alternative, a design directly based
on probabilistic methods may be used.
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8/11/2019 En 1990 Basis of Structural Design - Annex B Reliability Differentiation Annex C Reliability Theory
5/31
Brussels, 18-20 February 2008 Dissemination of information workshop 5
EUROCODESBackground and Applications
