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EN 1993-1-9 fatigue and SCF's

EN 1993-1-9 fatigue and SCF's

EN 1993-1-9 fatigue and SCF's

(OP)
When finding design stress range, I understand we should account for stress concentrations.

1. My question pertains to the hot-spot method (geometric/structural stress method). When applying SCF's (stress concentration factor) to FEA results, is the SCF meant only to capture the non-idealized effects such as misalignment? I would expect the FEA to account for stress concentrations due to corners and holes, such that I would not want to apply another factor on top of that.

2. Also, when would you use the nominal stress vs modified nominal stress? Is the modified nominal stress used when the stress detail does not exactly match your specific condition and you need to capture an additional SCF?

I'm having trouble figuring out exactly when the code wants different SCF's applied and when it is not necessary if accounted for in the analysis explicitly.

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