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Partial safety factors for resistance of steel elements to EC3 and EC4 - Calibration for various steel products and failure criteria
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Partial safety factors for resistance of steel elements to EC3 and EC4 - Calibration for various steel products and failure criteria

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Eurocode 3 and Eurocode 4 are at present ENVs. Those standards incorporate partial safety factors γM for resistance. γMO is related to member resistance without instability, while γM1 is related to any limit state where instability governs. In the ENVs, γMO is taken equal to 1.1, contrary to the general opinion of steel construction experts who had proposed a value of 1.0 Hence, the first aim of this project is to collect data by analysing the products of as many steel producers as possible. Secondly, the safety factors are currently different from one country to another. So the present research project reconsiders a large number of design limit states, in order that future decisions for the value of γM1 may be based on clear evidence, tending to limit the national deviations. The first objective (γMO) is addressed by measurement campaigns in steel mills for hot-rolled product characteristics (dimensions and yield strength). Those measured values are used to compute resistances, wich are compared with resistances resulting from the nominal values. A statistical analysis of deviations results in safety factors. The results are quite satisfactory, a value of 1.0 being justified. Concerning the second objective (γM1), some experimentation was performed for specific cases, but the main methodology was to gather existing test results and to poceed with extensive statistical recalibartion of the safety factors. Recalibrations were based on the same statistical method described in Chapter II. The analysis does not lead to a simple generally applicable conclusion concerning the choice of γM1, but the background information is summarised in Chapter IV for consideration by expert groups responsible for the conversion of EC3 and EC4.
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ISBN 92-894-3696-4
Número de catálogo KI-NA-20-344-EN-S
Impreso
ISSN ISBN 92-894-3696-4 DOI Número de catálogo KI-NA-20-344-EN-S
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