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Design compressive strength of concrete: the coefficient αcc

Eurocode 2 part 2: Design of concrete bridge structures   3.1.6 (101)P

The value of the design compressive strength is defined as:

fcd = αcc fck / γC (3.15)


is the partial safety factor for concrete
is the coefficient taking account of long term effects on the compressive strength and of unfavourable effects resulting from the way the load is applied.


The value of αcc for the calculation of the design compressive strength of concrete should lie between 0,8 and 1,0. The recommended value is 0,85.

National choice