Read AppendixB.pdf text version

Guideline for Offshore Structural Reliability Analysis - General

DNV Report No. 95-2018

Page No. 292

Appendix B

_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

APPENDIX B: TARGET RELIABILITY LEVELS IN DESIGN CODES

B.1 Eurocode B.2 Canadian Standards Association B.3 Det Norske Veritas B.4 Nordic Committee for Safety of Structures References

292

293 293 293 294 294

Skjong,R, E.B.Gregersen, E.Cramer, A.Croker, Ø.Hagen, G.Korneliussen, S.Lacasse, I.Lotsberg, F.Nadim,K.O.Ronold (1995) "Guideline for Offshore Structural Reliability Analysis-General", DNV:95-2018

Guideline for Offshore Structural Reliability Analysis - General

DNV Report No. 95-2018

Page No. 293

Appendix B

_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

Appendix B: Target Reliability Levels in Design Codes

B.1 Eurocode

In Eurocode 1 (1993), the indicative target reliabilities are given in Table B. 1. Table B.1 Target Reliabilities in Eurocode Annual Ptarget target target -4 3.8 4.7 0.7210 -1 -4 1.5-3.8 0.6710 -0.7210 -1 1.5 3.0 0.6710

Lifetime Ptarget 0.1310-5 0.1310-2

Limit State ULS FLS SLS

B.2 Canadian Standards Association

In CSA (1989), the target annual failure probabilities are given as quoted in Table B. 2. Table B.2 Target Annual Failure Probabilities in CSA Consequences of failure Great risk to life or high potential for environmnetal pollution or damage Small risk to life and low potential for environmental pollution or damage Impairment function/inserviceability

Safety Class 1 2 3

Ptarget 10-5 10-3 10-1

B.3 Det Norske Veritas

Target annual reliabilities are given in Classification Note 30.6 (DNV, 1992), to be used when no calibration against well established practice or similar designs are available, see Table B. 3. Table B.3 Target Annual Failure Probabilities in DNV Consequences Class of Failure Less Serious Serious I - Redundant Structure 10-3 10-4 II - Non-redundant structure, significant 10-4 10-5 warning before failure III - Non-redundant

Skjong,R, E.B.Gregersen, E.Cramer, A.Croker, Ø.Hagen, G.Korneliussen, S.Lacasse, I.Lotsberg, F.Nadim,K.O.Ronold (1995) "Guideline for Offshore Structural Reliability Analysis-General", DNV:95-2018

Guideline for Offshore Structural Reliability Analysis - General

DNV Report No. 95-2018

Page No. 294

Appendix B

_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

structure, no warning before failure

10-5

10-6

B.4 Nordic Committee for Safety of Structures

The Nordic Committee for Safety of Structures, NKB (1978), gives the annual target failure probabilities quoted in Table B. 4. The NKB document has later been revised and the corresponding table has been reduced (1987). Table B.4 Target Annual Failure Probabilities in NKB Type of failure Consequences of Ductile with reserve Ductile without Brittle instability failure capacity reserve capacity Not serious 10-3 10-4 10-5 -4 -5 Serious 10 10 10-6 Very serious 10-5 10-6 10-7

References

Nordic Committee for Building Structures (NKB) (1978), "Recommendations for Loading and Safety Regulations for Structural Design", NKB Report No. 36. Canadian Standards Association (CSA) (1989), "General Requirements, Design Criteria, the Environment, and Loads", Part 1 of the Code for the Design, Construction, and Installation of Fixed Offshore Structures, Preliminary Standard S471-M1989, Canadian Standards Association, Rexdale (Toronto), Ontario, Canada. Det Norske Veritas (1992), "Structural Reliability Analysis of Marine Structures", DNV Classification Note No. 30.6. Eurocode 1 (1993), "Eurocode 1: Basis of Design and Actions on Structures. Part 1: Basis of Design. Annex 2: Partial Factor Design: Background."

Skjong,R, E.B.Gregersen, E.Cramer, A.Croker, Ø.Hagen, G.Korneliussen, S.Lacasse, I.Lotsberg, F.Nadim,K.O.Ronold (1995) "Guideline for Offshore Structural Reliability Analysis-General", DNV:95-2018

Information

3 pages

Find more like this

Report File (DMCA)

Our content is added by our users. We aim to remove reported files within 1 working day. Please use this link to notify us:

Report this file as copyright or inappropriate

235531


You might also be interested in

BETA
Guideline for Offshore Structural Reliability Analysis
DNV-OS-F101: Submarine Pipeline Systems
DNV-OS-E301: Position Mooring
Offshore Codes DNV-OS-E301 - Position Mooring