# Design tensile strength of concrete: the coefficient `α`_{ct}

_{ct}

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

The value of the design tensile strength is defined as:

f = _{ctd}α _{ct}f / _{ctk,0,05}γ_{C} | (3.16) |

where:

`γ`_{C}- is the partial safety factor for concrete
`α`_{ct}- 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.

## Recommendation

The value of `α _{ct}` for the calculation of the design tensile strength of concrete should lie between 0,8 and 1,0. The recommended value is 1,0.