Eurocode 3

Eurocode 3 gives guidelines for the design of steel structures. Based on these guidelines a catalog of fatigue analysis recommendations for a variety of seam welds is created. These guidelines can be used for the standard details of seam welds in the construction. An example of a standard weld is given in the following figure. Based on the recommendations, safety factors are determined.

Example of a Eurocode 3 Catalog Entry for a Standard Welded Build-up Section (Butt Weld on Both Sides)

An example of such a safety factor is yMf. Eurocode 3 recommends this factor for poorly accessible components and components where a failure leads to rapid failure of the whole structure (non-fail-safe components). In Specialist Durability, this safety factor can be applied by dividing the surface influence factor in the solution parameters by the value of yMf. The Eurocode 3 recommended values for yMf are given in the following table, Recommended Values for Safety Factor yMf.

	Fail-Safe Components	Non Fail-Safe components
Periodic inspection and maintenance. Accessible joint detail.	1.0	1.25
Periodic inspection and maintenance. Poor accessibility	1.15	1.35

For the Mean Stress Correction, Eurocode 3 recommends using SW/NS/EC3 low RS for details with low residual stresses and SW/NS/ EC3 high RS for all other details. These recommendations can be defined under the solution parameters of the fatigue analysis case in Specialist Durability.

For damage accumulation rule, Eurocode 3 recommends using the Haibach-Miner rule. The Specialist Durability-implemented Haibach-Miner rule does not account for the cut-off at N = 109 cycles as recommended in the Eurocode 3, but uses the Specialist Durability intrinsic filtering mechanisms that leads to an equivalent result.

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