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Design tensile strength of concrete: the coefficient αct

Eurocode 2 part 2: Design of concrete bridge structures   3.1.6 (102)P

The value of the design tensile strength is defined as:

fctd = αct fctk,0,05 / γC (3.16)


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


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

National choice