Intelligent Presetting of Partial Safety Factors for Load Combinations

Tips & Tricks

In the ‘Edit Load Cases and Combinations’ dialog box, under the ‘Load Combinations’ tab, you have the option to combine different loads into one load combination. Usually, the load cases contain characteristic loads without safeties. Therefore, these load cases must be multiplied by certain partial safety factors depending on the design situation.

Example

Load combination CO1: 1.35 × LC1 ‘Self weight’ + 1.5 × LC2 ‘Imposed load’

Depending on the category (self‑weight, wind, snow, imposed load, temperature, prestress, accidental, settlements of foundation soil, seismic, others, imperfections), the following partial safety factors are applied when you select a load case:

  • 1.35 for permanent load cases (self‑weight)
  • 1.50 for variable load cases (wind, snow, imposed load, temperature, settlements, others)
  • 1.00 for special load cases (prestress, accidental, seismic, imperfection)

If no partial safety factors are needed in a load combination, you can use the [1.0] button. After activating this function, the automatic mechanism mentioned above is deactivated and a partial safety factor of 1.0 is applied.

You can also specify partial safety factors manually and in standard overwrite the default setting described above by a new value.

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