OS-C501
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Offshore Standard DNV-<strong>OS</strong>-<strong>C501</strong>, November 2013<br />

App.E Tables of safety factors – Page 225<br />

E.1 Partial safety factors<br />

E.1.1 General<br />

APPENDIX E TABLES OF SAFETY FACTORS<br />

E.1.1.1 Partial safety factors depend on the safety class and the failure type. The partial factors are available<br />

for five different levels.<br />

E.1.1.2 The selection of the levels is given in Table E-1 for the ultimate limit state.<br />

E.1.1.3 The recommended selection of the levels for the serviceability limit state is given in Table E-2.<br />

E.1.1.4 Factors for each level A, B, C, D and E are given in the following:<br />

Table E-1 Target reliability levels for ULS<br />

SAFETY CLASS<br />

FAILURE TYPE<br />

Ductile/Plastic Brittle<br />

Low A B<br />

Normal B C<br />

High C D<br />

Table E-2 Target reliability levels for SLS<br />

SERVICE CLASS SERVICE FAILURES<br />

Normal<br />

A<br />

High<br />

B<br />

Table E-3 Target reliability level A<br />

Distribution types Local response: Extreme of Gaussian Characteristic load: 99% quantile<br />

Resistance: Normal<br />

Characteristic resistance: 2.5% quantile<br />

Local response<br />

Resistance COV<br />

COV<br />

0.00 0.05 0.10 0.125 0.15<br />

0.00 γ FM<br />

1.07<br />

1.16<br />

1.26<br />

1.36<br />

γ FM = γ F x γ M 1.00x1.07 1.00x1.16 1.00x1.26 1.00x1.36<br />

0.05 1.07<br />

1.01<br />

1.04<br />

1.09<br />

1.16<br />

1.07x1.00 1.02x0.99 0.93x1.12 0.91x1.19 0.91x1.26<br />

0.10 1.10<br />

1. 10x1.00<br />

1.03<br />

1.07x0.96<br />

1.01<br />

0.98x1.04<br />

1.03<br />

0.91x1.13<br />

1.08<br />

0.87x1.23<br />

0.15 1.13<br />

1.13x1.00<br />

1.04<br />

1.10x0.95<br />

1.01<br />

1.01x1.00<br />

1.02<br />

0.96x1.06<br />

1.05<br />

0.90x1.17<br />

0.20 1.14<br />

1.06<br />

1.01<br />

1.01<br />

1.03<br />

1.14x1.00 1.12x0.94 1.04x0.97 0.98x1.03 0.92x1.12<br />

Table E-4 Target reliability level A<br />

Distribution types Local response: Gumbel Characteristic load: 99% quantile<br />

Resistance: Normal<br />

Characteristic resistance: 2.5% quantile<br />

Local response<br />

Resistance COV<br />

COV<br />

0.00 0.05 0.10 0.125 0.15<br />

0.00 γ FM<br />

1.07<br />

1.16<br />

1.26<br />

1.36<br />

γ FM = γ F x γ M 1.00x.1.07 1.00x 1.16 1.00x1.26 1.00x1.36<br />

0.05 1.09<br />

1. 01<br />

1.03<br />

1.08<br />

1.14<br />

1.09x1.00 1.04x0.97 0.93x1.11 0.90x1.20 0.88x1.29<br />

0.10 1.14<br />

1.14x1.00<br />

1.05<br />

1.11x0.94<br />

1.01<br />

1.02x0.99<br />

1.02<br />

0.95x1.07<br />

1.05<br />

0.88x1.20<br />

0.15 1.18<br />

1.18x1.00<br />

1.09<br />

1.16x0.93<br />

1.03<br />

0.75x1.37<br />

1.01<br />

1.03x0.98<br />

1.02<br />

0.95x1.08<br />

0.20 1.22<br />

1.12<br />

1.05<br />

1.02<br />

1.02<br />

1.22x1.00 1.20x0.93 1.14x0.92 1.09x0.94 1.01x1.00<br />

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