Torsion
Crosssectional Inputs
All references to EN 199511:2004
unless otherwise stated.
This tests a crosssection in torsion according to Clause 6.1.8
.
Timber type
The timber type of the crosssection. See the timber database section for the types supported by Teretron.
Crosssection type
The geometry type of the crosssection.
Width bThe width of a rectangular crosssection, in mm. Depth hThe depth of a rectangular crosssection, in mm. 

Diameter dThe diameter of a circular crosssection, in mm. 
Torsion constant reduction
The torsion constant reduction ΔW_{p} refers to reductions in the nominal torsion constant that have to be taken into account in the calculation of the member strength (e.g. holes from fasteners) according to Subclause 5.2(2)
.
It should be given as a percentage of the total nominal torsion constant.
Contribution of the load distribution system in the member strength properties
Includes factor k_{sys} for the calculation of the member strength, according to Clause 6.6
, for a member that functions as part of a continuous load distribution system.
Note that Subclause 6.6(3)
states that the strength verification for a continuous load distribution system should be carried out assuming shortterm load duration.