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The EN 1993-1-8, Art 6.2.4.1 Table 6.2 specifies Lb as the bolt elongation length, taken equal to the grip length (total thickness of material and washers), plus half the sum of the height of the bolt head and the height of the nut.
Within SCIA Engineer:
Lb = tf+tep+(hh + hn)/2
with:
| tf | thickness of the column flange |
| tep | thickness of the end-plate |
| hh | height of the bolt head |
| hn | height of the nut |
If relevant also thickness of a washer/s and thickness of a backing plate is added. In this case:
Lb = tf+tep+(hh + hn)/2 + alt (twh+twn+tbp)
with:
| twh | thickness of the washer at bolt head |
| twn | thickness of the washer at nut |
| tbp | thickness of the backing plate |
Similar formulas are being used in case of a splice connection. The thickness of a column flange tf is replaced by the thickness of the additional end-plate.