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Reliability analysis of structural stainless steel design provisions

Reliability analysis of structural stainless steel design provisions
Reliability analysis of structural stainless steel design provisions

Abstract Since the establishment of the Eurocode design provisions for structural stainless steel, a considerable amount of both statistical material data and experimental results on structural elements has been generated. In light of this, the current partial resistance factors recommended in EN 1993-1-4 for the design of stainless steel elements are re-evaluated. First, following an analysis of material data from key stainless steel producers, representative values of the over-strength and the coefficient of variation (COV) of the material yield strength and ultimate tensile strength were established. For yield strength, over-strength values and COVs of 1.3 and 0.060 for austenitic, 1.1 and 0.030 for duplex and 1.2 and 0.045 for ferritic stainless steels were determined. For the ultimate tensile strength, an over-strength value of 1.1 was found to be suitable for all stainless steel grades, and COV values of 0.035 for the austenitic and duplex grades and 0.05 for the ferritic grade were proposed. For the variability of the geometric properties, a COV value of 0.05 was recommended. Analysis of available experimental results based on the First Order Reliability Method (FORM), set out in EN 1990 Annex D, and utilising the derived statistical material parameters, revealed that the current recommended partial resistance factors in EN 1993-1-4 (γM0 = γM1 = 1.1 and γM2 = 1.25) cannot generally be reduced, and in some cases, modified design resistance equations are required, if the current safety factors are to be maintained.

Material over-strength, Partial factors, Reliability, Stainless steel, Statistical parameters, Variability
0143-974X
293-304
Afshan, S.
68dcdcac-c2aa-4c09-951c-da4992e72086
Francis, P.
72f0ae87-8f97-4742-83ab-475a79c53161
Baddoo, N. R.
7151609e-55d1-46fc-bb79-9d5502c92c6f
Gardner, L.
2d5fc7ca-efd9-425a-981c-73d3937aca08
Afshan, S.
68dcdcac-c2aa-4c09-951c-da4992e72086
Francis, P.
72f0ae87-8f97-4742-83ab-475a79c53161
Baddoo, N. R.
7151609e-55d1-46fc-bb79-9d5502c92c6f
Gardner, L.
2d5fc7ca-efd9-425a-981c-73d3937aca08

Afshan, S., Francis, P., Baddoo, N. R. and Gardner, L. (2015) Reliability analysis of structural stainless steel design provisions. Journal of Constructional Steel Research, 114, 293-304. (doi:10.1016/j.jcsr.2015.08.012).

Record type: Article

Abstract

Abstract Since the establishment of the Eurocode design provisions for structural stainless steel, a considerable amount of both statistical material data and experimental results on structural elements has been generated. In light of this, the current partial resistance factors recommended in EN 1993-1-4 for the design of stainless steel elements are re-evaluated. First, following an analysis of material data from key stainless steel producers, representative values of the over-strength and the coefficient of variation (COV) of the material yield strength and ultimate tensile strength were established. For yield strength, over-strength values and COVs of 1.3 and 0.060 for austenitic, 1.1 and 0.030 for duplex and 1.2 and 0.045 for ferritic stainless steels were determined. For the ultimate tensile strength, an over-strength value of 1.1 was found to be suitable for all stainless steel grades, and COV values of 0.035 for the austenitic and duplex grades and 0.05 for the ferritic grade were proposed. For the variability of the geometric properties, a COV value of 0.05 was recommended. Analysis of available experimental results based on the First Order Reliability Method (FORM), set out in EN 1990 Annex D, and utilising the derived statistical material parameters, revealed that the current recommended partial resistance factors in EN 1993-1-4 (γM0 = γM1 = 1.1 and γM2 = 1.25) cannot generally be reduced, and in some cases, modified design resistance equations are required, if the current safety factors are to be maintained.

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More information

Accepted/In Press date: 3 August 2015
e-pub ahead of print date: 15 August 2015
Published date: 1 November 2015
Keywords: Material over-strength, Partial factors, Reliability, Stainless steel, Statistical parameters, Variability

Identifiers

Local EPrints ID: 429863
URI: https://eprints.soton.ac.uk/id/eprint/429863
ISSN: 0143-974X
PURE UUID: 42cc6ef9-680a-43a7-8f7c-c7fb47cb4a6c

Catalogue record

Date deposited: 08 Apr 2019 16:30
Last modified: 08 Apr 2019 16:30

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