FAQ - Difference between ASD and Eurocode calculations for truss explained

Differences between the old and new calculation principles:
Before the new Euro Codes were implemented, calculations for truss and truss structures were made according to the ASD (Allowable Stress Design) calculation method. The principles of these calculations were written in the DIN standard. This standard provided all the figures for the maximum allowable stress for different Aluminium alloys in non-welded and welded positions. The new calculations of truss and truss constructions are according to the Euro codes and these calculations are based on the LRFD (Load Resistance Factor Design) calculation method. This is a semi probabilistic safety concept and is based on the theory of probability and partial safety factors.

The difference between these two design methods is the position of the safety factors in the calculations. In the ASD method we put all the required safety factors on the material side of the calculation. In the LRFD method we put a small safety factor on the material side and a bigger safety factor on the load side of the calculation. This makes it possible to have different safety factors for different types of loading.

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Laurynas Paškevicius Stage Technical Service, Lithuania