Tension parallel to the grain

Fire Design

Active

Selects if this cross-section will also be designed against fire.

Cross-section surface

Defines if the cross-section surface is unprotected (exposed to fire on all sides) or is protected (on all sides).

Time of fire exposure t

The time of the exposure of the cross-section to fire, in minutes.

Time tch

The time of exposure of a protected cross-section to fire until it starts to char, in minutes.

Time tf

The time of exposure of a protected cross-section to fire until the protection fails completely, in minutes.

Note that this is can be longer (but not shorter) than tch.

Factor k2

Factor k2 that defines the charring rate of a protected cross-section between the time it starts to char and the time the protection fails completely.

It is required when tch has a different value to tf.

Theoretical charring rate βn

The theoretical charring rate of the timber, in mm per minute.

It is required for plywood where the relevant standards do not provide a default value.