Design compressive force F_t,0,d

The design value of the compressive force acting on the cross-section parallel to the grain, in kN.

Load duration class

The load duration class, as defined in Clause 2.3.1.2

Service class

The service class, taking into account the temperature and relative humidity of the environment, as described in Clause 2.3.1.3.

k_mod

Factor k_mod taking into account the effect of the duration of the loads and the moisture content, according to Clause 3.1.3.