Beam design
Crosssectional Inputs
All references to EN 199511:2004
unless otherwise stated.
This a beam of constant crosssection under bending about the yy axis, or combined bending about the yy axis and compression parallel to the grain, taking into account lateraltorsional buckling effects, according to Clause 6.3.3
.
Timber Type
The Timber Type of the crosssection. See the timber database section for the types supported by Teretron.
Beam span l
The length of the beam, in mm.
Support conditions
The type of support conditions. Teretron supports the following support conditions for beams:
 ○ Simply supported (one support pinned, the other a roller)
 ○ Cantilever (one support fully fixed, and the other free to rotate and move in all directions)
For other support conditions, the user has to select other and enter the relevant effective length factor.
Note that you can change the effective length factors used by Teretron for either the specific beam or the entire project via Component > Component Factors or Project > Project Factors respectively.
Factor l_{ef} / l
This refers to the effective length factor for support conditions not covered by Teretron (choice "Other" in the "Support Conditions" list box).
Prevention of lateral displacement and torsional rotation as per Subclase 6.3.3(5) of EC5
Subclause 6.3.3(5)
states that "The factor k_{crit} may be taken as 1,0 for a beam where lateral displacement of its compressive edge is prevented throughout its length and where torsional rotation is prevented at its supports".
This check box allows the user to select if these conditions apply or not.
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. 
Area A
The area of a generic crosssection, in mm^{2}.
Section modulus W_{y}
The section modulus of the crosssection about the yy axis, in mm^{3}.
Second moment of area I_{zz}
The second moment of area of a generic crosssection about the zz axis, in mm^{4}.
Torsional moment of area I_{tor}
The torsional moment of area of a generic crosssection, in mm^{4}.
Area reduction
The area reduction ΔA refers to reductions in the nominal crosssection size 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 area of the crosssection.
Section modulus reduction
The section modulus reduction ΔW refers to reductions in the nominal crosssectional modulus that are 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 section modulus of the crosssection.
Characteristic modulus of elasticity E_{m.0.05 }
The characteristic modulus of elasticity in bending parallel to the plane of the board, in GPa.
It is required for certain types of plywood, where the existing standards do not provide a value.
Characteristic modulus of elasticity E_{m.90.05 }
The characteristic modulus of elasticity in bending perpendicular to the plane of the board, in GPa.
It is required in certain types of plywood, where the existing standards do not provide a value.
Characteristic shear modulus G_{}0.05
The characteristic shear modulus in GPa.
It is required for hardwood, where the existing standards do not provide a value.
Characteristic shear modulus G_{90.05 }
The characteristic modulus of elasticity in bending perpendicular to the plane of the board, in GPa.
It is required in certain types of plywood, where the existing standards do not provide a value.
Factor β_{c}
The straightness factor β_{c}. It is required for plywood where no value is given in the standard.
Contribution of crosssection size on the determination of member strength properties
Includes factors k_{h} for the calculation of the member strength in solid timber, glulam and LVL, according to Clauses 3.2
, 3.3
, and 3.4
.
In the case of an LVL member under tension, the member length is also required.
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.