For some standards, the Standard parameter tab of the 'Ultimate configuration' or 'Strength configuration' dialog box is available. Here, all coefficients relevant to the design checks are listed.
The 'Design settings' are matched to the sections of the respective standard. The following sections describe the parameters of these standards:
EN 1995
All coefficients relevant to the selected National annex are listed. The default setting corresponds to the standard specification or the recommendation. The 'Note' column specifies the standard section to which a parameter refers. Reduction factors are automatically taken into account by default, whereas increase factors are not activated. You can activate the corresponding coefficients by ticking the check boxes if the requirements are met. In this way, for example, favorable factors for laminated veneer lumber can be taken into account in the design checks.
If it is necessary to adjust a coefficient, you can also define it as a user-defined value. The stress distribution factor kdis plays a particularly important role for duopitch roof beams in order to take into account effects of tensile stress perpendicular to the grain for curved cross-section distributions.
Use the
button in the status bar of the dialog box to restore the default values of the National annex.
NDS
All coefficients relevant to the design according to NDS are listed. The default setting corresponds to the standard specification. The 'Note' column specifies the standard section to which a parameter refers.
Use the
button in the status bar of the dialog box to restore the default values of the standard.
CSA O86
In this tab, you can adjust some parameters that are relevant for the design according to CSA.
If members made of dimensional lumber meet the requirements listed in Section 6.4.4, select 'Case 1' or 'Case 2' in the list to apply the corresponding system factor KH according to Table 6.13.
For members made of glued-laminated timber, you can select the laminate thickness in the list. The thicknesses listed in Table A.7 are included. Activate the 'Use multi-piece laminations' option to use the width of the widest part as the effective lamination width b for determining the ultimate shear strength at notches on the tension side at the support in accordance with Section 7.5.7.5.2. If the option is deactivated (single-piece laminations), b corresponds to the full beam width. You can check the width after the calculation in the design check details.
If the glued-laminated timber members meet the requirements listed in Section 7.4.4, tick the 'Consider system factor' option. The factor KH is assumed to be KH = 1.10 for all strength properties (with the exception of the tensile strength parallel to the grain direction, the shear strength at notches on the compression side, and the ultimate shear strength at a notch, for which KH = 1.00 applies).
For structural panels made of plywood in permanent wood foundations, you can 'Increase the panel bending strength by the factor KF = 1.5' in accordance with Section 9.4.5.